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annotate packages/io/serial/current/src/common/serial.c @ 130:eb9fd8c04db3 ecos-sw-2000-10-23

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Merge from eCos master repository on 2000-10-23-17:01:37-BST
author jlarmour
date Mon, 23 Oct 2000 17:10:57 +0000
parents 0c2b7be0d798
children 289bf90c6a9b
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1 //==========================================================================
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2 //
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3 // io/serial/common/serial.c
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4 //
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5 // High level serial driver
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas, grante, jlarmour, jskov
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36 // Date: 1999-02-04
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37 // Purpose: Top level serial driver
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38 // Description:
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39 //
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40 //####DESCRIPTIONEND####
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41 //
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42 //==========================================================================
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43
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44 #include <pkgconf/io.h>
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45 #include <pkgconf/io_serial.h>
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46
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47 #include <cyg/io/io.h>
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48 #include <cyg/io/devtab.h>
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49 #include <cyg/io/serial.h>
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50 #include <cyg/infra/cyg_ass.h> // assertion support
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51 #include <cyg/infra/diag.h> // diagnostic output
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53 static Cyg_ErrNo serial_write(cyg_io_handle_t handle, const void *buf, cyg_uint32 *len);
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54 static Cyg_ErrNo serial_read(cyg_io_handle_t handle, void *buf, cyg_uint32 *len);
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55 static Cyg_ErrNo serial_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info);
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56 static Cyg_ErrNo serial_get_config(cyg_io_handle_t handle, cyg_uint32 key, void *buf, cyg_uint32 *len);
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57 static Cyg_ErrNo serial_set_config(cyg_io_handle_t handle, cyg_uint32 key, const void *buf, cyg_uint32 *len);
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58
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59 DEVIO_TABLE(cyg_io_serial_devio,
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60 serial_write,
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61 serial_read,
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62 serial_select,
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63 serial_get_config,
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64 serial_set_config
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65 );
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67 static void serial_init(serial_channel *chan);
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68 static void serial_xmt_char(serial_channel *chan);
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69 static void serial_rcv_char(serial_channel *chan, unsigned char c);
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70 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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71 static void serial_indicate_status(serial_channel *chan,
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72 cyg_serial_line_status_t *s);
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73 #endif
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74 #if CYGINT_IO_SERIAL_BLOCK_TRANSFER
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75 static rcv_req_reply_t serial_data_rcv_req(serial_channel *chan, int avail,
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76 int* space_avail,
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77 unsigned char** space);
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78 static void serial_data_rcv_done(serial_channel *chan, int chars_rcvd);
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79 static xmt_req_reply_t serial_data_xmt_req(serial_channel *chan, int space,
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80 int* chars_avail,
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81 unsigned char** chars);
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82 static void serial_data_xmt_done(serial_channel *chan, int chars_sent);
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83 # ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
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84 SERIAL_CALLBACKS(cyg_io_serial_callbacks,
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85 serial_init,
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86 serial_xmt_char,
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87 serial_rcv_char,
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88 serial_data_rcv_req,
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89 serial_data_rcv_done,
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90 serial_data_xmt_req,
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91 serial_data_xmt_done,
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92 serial_indicate_status);
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93
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94 # else
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95 SERIAL_CALLBACKS(cyg_io_serial_callbacks,
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96 serial_init,
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97 serial_xmt_char,
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98 serial_rcv_char,
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99 serial_data_rcv_req,
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100 serial_data_rcv_done,
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101 serial_data_xmt_req,
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102 serial_data_xmt_done);
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103 # endif
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104 #else
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105 # ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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106 SERIAL_CALLBACKS(cyg_io_serial_callbacks,
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107 serial_init,
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108 serial_xmt_char,
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109 serial_rcv_char,
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110 serial_indicate_status);
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111 # else
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112 SERIAL_CALLBACKS(cyg_io_serial_callbacks,
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113 serial_init,
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114 serial_xmt_char,
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115 serial_rcv_char);
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116 # endif
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117 #endif
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118
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119 // ---------------------------------------------------------------------------
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120
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121 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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122
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123 static __inline__ void
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124 throttle_tx( serial_channel *chan )
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125 {
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126 chan->flow_desc.flags |= CYG_SERIAL_FLOW_OUT_THROTTLED;
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127 // the throttling itself occurs in the serial_xmt_char() callback
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128 }
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129
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130 static __inline__ void
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131 restart_tx( serial_channel *chan )
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132 {
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133 serial_funs *funs = chan->funs;
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134
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135 chan->flow_desc.flags &= ~CYG_SERIAL_FLOW_OUT_THROTTLED;
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136
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137 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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138 // See if there is now enough room to say it is available
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139 // for writing
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140 {
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141 cbuf_t *cbuf = &chan->out_cbuf;
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142 int space;
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143
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144 space = cbuf->len - cbuf->nb;
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145 if (space >= cbuf->low_water)
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146 cyg_selwakeup( &cbuf->selinfo );
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147 }
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148 #endif
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149 if ( chan->out_cbuf.nb > 0 )
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150 (funs->start_xmit)(chan);
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151 }
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152
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153 static __inline__ void
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154 throttle_rx( serial_channel *chan, cyg_bool force )
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155 {
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156 serial_funs *funs = chan->funs;
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157
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158 chan->flow_desc.flags |= CYG_SERIAL_FLOW_IN_THROTTLED;
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159 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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160 // send an xoff
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161 if ( force || chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_RX ) {
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162 chan->flow_desc.xchar = CYGDAT_IO_SERIAL_FLOW_CONTROL_XOFF_CHAR;
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163 // Make sure xmit is running so we can send it
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164 (funs->start_xmit)(chan);
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165 }
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166 #endif
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167 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
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168 {
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169 cyg_uint32 i=1;
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170 cyg_uint32 len = sizeof(i);
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171
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172 // set hardware flow control - don't care if it fails
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173 if ( force || (chan->config.flags & CYGNUM_SERIAL_FLOW_RTSCTS_RX) ||
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174 (chan->config.flags & CYGNUM_SERIAL_FLOW_DSRDTR_RX) )
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175 (funs->set_config)(chan,
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176 CYG_IO_SET_CONFIG_SERIAL_HW_RX_FLOW_THROTTLE,
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177 &i, &len);
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178 }
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179 #endif
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180 }
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181
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182 static __inline__ void
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183 restart_rx( serial_channel *chan, cyg_bool force )
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184 {
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185 serial_funs *funs = chan->funs;
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186
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187 chan->flow_desc.flags &= ~CYG_SERIAL_FLOW_IN_THROTTLED;
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188 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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189 // send an xon
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190 if ( force || chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_RX ) {
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191 chan->flow_desc.xchar = CYGDAT_IO_SERIAL_FLOW_CONTROL_XON_CHAR;
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192 (funs->start_xmit)(chan); // Make sure xmit is running so we can send it
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193 }
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194 #endif
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195 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
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196 {
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197 cyg_uint32 i=0;
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198 cyg_uint32 len = sizeof(i);
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199
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200 // set hardware flow control - don't care if it fails
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201 if ( force || (chan->config.flags & CYGNUM_SERIAL_FLOW_RTSCTS_RX) ||
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202 (chan->config.flags & CYGNUM_SERIAL_FLOW_DSRDTR_RX) )
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203 (funs->set_config)(chan,
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204 CYG_IO_SET_CONFIG_SERIAL_HW_RX_FLOW_THROTTLE,
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205 &i, &len);
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206 }
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207 #endif
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208 }
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209
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210 #endif
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211
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212 // ---------------------------------------------------------------------------
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213
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214 static void
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215 serial_init(serial_channel *chan)
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216 {
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217 if (chan->init) return;
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218 if (chan->out_cbuf.len != 0) {
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219 #ifdef CYGDBG_IO_INIT
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220 diag_printf("Set output buffer - buf: %x len: %d\n", chan->out_cbuf.data, chan->out_cbuf.len);
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221 #endif
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222 chan->out_cbuf.waiting = false;
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223 chan->out_cbuf.abort = false;
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224 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
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225 chan->out_cbuf.blocking = true;
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226 #endif
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227 chan->out_cbuf.pending = 0;
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228 cyg_drv_mutex_init(&chan->out_cbuf.lock);
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229 cyg_drv_cond_init(&chan->out_cbuf.wait, &chan->out_cbuf.lock);
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230 chan->out_cbuf.low_water = chan->out_cbuf.len / 4;
115
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231 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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232 cyg_selinit( &chan->out_cbuf.selinfo );
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233 #endif
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234 }
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235 if (chan->in_cbuf.len != 0) {
115
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236 cbuf_t *cbuf = &chan->in_cbuf;
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237
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238 #ifdef CYGDBG_IO_INIT
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239 diag_printf("Set input buffer - buf: %x len: %d\n", cbuf->data, cbuf->len);
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240 #endif
115
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241 cbuf->waiting = false;
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242 cbuf->abort = false;
86
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243 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
115
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244 cbuf->blocking = true;
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245 #endif
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246 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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247 cyg_selinit( &cbuf->selinfo );
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248 #endif
115
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249 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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250 cbuf->low_water =
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251 (CYGNUM_IO_SERIAL_FLOW_CONTROL_LOW_WATER_PERCENT * cbuf->len) / 100;
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252 cbuf->high_water =
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253 (CYGNUM_IO_SERIAL_FLOW_CONTROL_HIGH_WATER_PERCENT * cbuf->len) / 100;
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254 # ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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255 // But make sure it is at least 35 below buffer size, to allow
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256 // for 16 byte fifos, twice, plus some latency before s/w flow
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257 // control can kick in. This doesn't apply to h/w flow control
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258 // as it is near-instaneous
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259 if ( (cbuf->len - cbuf->high_water) < 35 )
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260 cbuf->high_water = cbuf->len - 35;
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261 // and just in case...
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262 if ( cbuf->high_water <= 0 )
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263 cbuf->high_water = 1;
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264 if ( cbuf->low_water > cbuf->high_water )
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265 cbuf->low_water = cbuf->high_water;
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266 # endif
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267 #endif
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268 cyg_drv_mutex_init(&cbuf->lock);
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269 cyg_drv_cond_init(&cbuf->wait, &cbuf->lock);
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270 }
115
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271 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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272 chan->status_callback = NULL;
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273 #endif
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274
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275 #ifdef CYGDBG_USE_ASSERTS
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276 #ifdef CYGINT_IO_SERIAL_BLOCK_TRANSFER
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277 chan->in_cbuf.block_mode_xfer_running = false;
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278 chan->out_cbuf.block_mode_xfer_running = false;
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279 #endif // CYGINT_IO_SERIAL_BLOCK_TRANSFER
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280 #endif // CYGDBG_USE_ASSERTS
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281 chan->init = true;
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282 }
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283
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284 // ---------------------------------------------------------------------------
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285 // FIXME:@@@ Throughout this file there are uses of cyg_drv_cond_signal and
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286 // cyg_drv_cond_broadcast. Does it matter which? -Jifl
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287
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288 static Cyg_ErrNo
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289 serial_write(cyg_io_handle_t handle, const void *_buf, cyg_uint32 *len)
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290 {
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291 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
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292 serial_channel *chan = (serial_channel *)t->priv;
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293 serial_funs *funs = chan->funs;
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294 cyg_int32 size = *len;
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295 cyg_uint8 *buf = (cyg_uint8 *)_buf;
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296 int next;
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297 cbuf_t *cbuf = &chan->out_cbuf;
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298 Cyg_ErrNo res = ENOERR;
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299
115
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300 cyg_drv_mutex_lock(&cbuf->lock);
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301 cbuf->abort = false;
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302
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303 if (cbuf->len == 0) {
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304 // Non interrupt driven (i.e. polled) operation
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305 while (size-- > 0) {
115
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306 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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307 while ( ( 0 == (chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) ) &&
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308 ((funs->putc)(chan, *buf) == false) )
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309 ; // Ignore full, keep trying
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310 #else
128
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311 while ((funs->putc)(chan, *buf) == false)
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312 ; // Ignore full, keep trying
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313 #endif
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314 buf++;
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315 }
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316 } else {
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317 cyg_drv_dsr_lock(); // Avoid race condition testing pointers
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318 while (size > 0) {
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319 next = cbuf->put + 1;
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320 if (next == cbuf->len) next = 0;
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321 if (cbuf->nb == cbuf->len) {
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322 cbuf->waiting = true;
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323 // Buffer full - wait for space
115
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324 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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325 if ( 0 == (chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) )
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326 #endif
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327 (funs->start_xmit)(chan); // Make sure xmit is running
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328
128
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329 // Check flag: 'start_xmit' may have obviated the need
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330 // to wait :-)
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331 if (cbuf->waiting) {
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332 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
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333 // Optionally return if configured for non-blocking mode.
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334 if (!cbuf->blocking) {
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335 *len -= size; // number of characters actually sent
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336 cbuf->waiting = false;
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337 res = -EAGAIN;
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338 break;
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339 }
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340 #endif // CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
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341 cbuf->pending += size; // Have this much more to send [eventually]
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342 if( !cyg_drv_cond_wait(&cbuf->wait) )
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343 cbuf->abort = true;
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344 cbuf->pending -= size;
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345 }
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346 if (cbuf->abort) {
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347 // Give up!
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348 *len -= size; // number of characters actually sent
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349 cbuf->abort = false;
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350 cbuf->waiting = false;
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351 res = -EINTR;
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352 break;
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353 }
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354 } else {
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355 cbuf->data[cbuf->put++] = *buf++;
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356 cbuf->put = next;
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357 cbuf->nb++;
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358 size--; // Only count if actually sent!
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359 }
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360 }
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361 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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362 if ( 0 == (chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) )
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363 #endif
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364 (funs->start_xmit)(chan); // Start output as necessary
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365 cyg_drv_dsr_unlock();
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366 }
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367 cyg_drv_mutex_unlock(&cbuf->lock);
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368 return res;
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369 }
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370
115
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371
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372 // ---------------------------------------------------------------------------
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373
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374 static Cyg_ErrNo
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375 serial_read(cyg_io_handle_t handle, void *_buf, cyg_uint32 *len)
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376 {
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377 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
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378 serial_channel *chan = (serial_channel *)t->priv;
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379 serial_funs *funs = chan->funs;
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380 cyg_uint8 *buf = (cyg_uint8 *)_buf;
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381 cyg_int32 size = 0;
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382 cbuf_t *cbuf = &chan->in_cbuf;
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383 Cyg_ErrNo res = ENOERR;
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384 #ifdef XX_CYGDBG_DIAG_BUF
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385 extern int enable_diag_uart;
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386 int _enable = enable_diag_uart;
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387 int _time, _stime;
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388 externC cyg_tick_count_t cyg_current_time(void);
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389 #endif // CYGDBG_DIAG_BUF
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390
115
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391 cyg_drv_mutex_lock(&cbuf->lock);
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392 cbuf->abort = false;
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393
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394 if (cbuf->len == 0) {
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395 // Non interrupt driven (i.e. polled) operation
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396 while (size++ < *len) {
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397 cyg_uint8 c = (funs->getc)(chan);
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398 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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399 // for software flow control, if the driver returns one of the
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400 // characters we act on it and then drop it (the app must not
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401 // see it)
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402 if ( chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_TX ) {
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403 if ( c == CYGDAT_IO_SERIAL_FLOW_CONTROL_XOFF_CHAR ) {
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404 throttle_tx( chan );
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405 } else if ( c == CYGDAT_IO_SERIAL_FLOW_CONTROL_XON_CHAR ) {
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406 restart_tx( chan );
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407 }
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408 else
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409 *buf++ = c;
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410 }
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411 else
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412 *buf++ = c;
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413 #else
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414 *buf++ = c;
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415 #endif
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416 }
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417 } else {
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418 cyg_drv_dsr_lock(); // Avoid races
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419 while (size < *len) {
115
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420 if (cbuf->nb > 0) {
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421 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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422 if ( (cbuf->nb <= cbuf->low_water) &&
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423 (chan->flow_desc.flags & CYG_SERIAL_FLOW_IN_THROTTLED) )
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424 restart_rx( chan, false );
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425 #endif
2
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426 *buf++ = cbuf->data[cbuf->get];
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427 if (++cbuf->get == cbuf->len) cbuf->get = 0;
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428 cbuf->nb--;
2
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429 size++;
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430 } else {
86
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jlarmour
parents: 82
diff changeset
431 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
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parents: 82
diff changeset
432 if (!cbuf->blocking) {
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jlarmour
parents: 82
diff changeset
433 *len = size; // characters actually read
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jlarmour
parents: 82
diff changeset
434 res = -EAGAIN;
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jlarmour
parents: 82
diff changeset
435 break;
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jlarmour
parents: 82
diff changeset
436 }
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parents: 82
diff changeset
437 #endif // CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
2
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jlarmour
parents:
diff changeset
438 cbuf->waiting = true;
20
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jlarmour
parents: 4
diff changeset
439 #ifdef XX_CYGDBG_DIAG_BUF
115
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parents: 107
diff changeset
440 enable_diag_uart = 0;
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parents: 107
diff changeset
441 HAL_CLOCK_READ(&_time);
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diff changeset
442 _stime = (int)cyg_current_time();
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diff changeset
443 diag_printf("READ wait - get: %d, put: %d, time: %x.%x\n", cbuf->get, cbuf->put, _stime, _time);
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diff changeset
444 enable_diag_uart = _enable;
20
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jlarmour
parents: 4
diff changeset
445 #endif // CYGDBG_DIAG_BUF
115
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parents: 107
diff changeset
446 if( !cyg_drv_cond_wait(&cbuf->wait) )
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diff changeset
447 cbuf->abort = true;
20
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parents: 4
diff changeset
448 #ifdef XX_CYGDBG_DIAG_BUF
115
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diff changeset
449 enable_diag_uart = 0;
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diff changeset
450 HAL_CLOCK_READ(&_time);
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diff changeset
451 _stime = (int)cyg_current_time();
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diff changeset
452 diag_printf("READ continue - get: %d, put: %d, time: %x.%x\n", cbuf->get, cbuf->put, _stime, _time);
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diff changeset
453 enable_diag_uart = _enable;
20
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parents: 4
diff changeset
454 #endif // CYGDBG_DIAG_BUF
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
455 if (cbuf->abort) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
456 // Give up!
86
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parents: 82
diff changeset
457 *len = size; // characters actually read
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
458 cbuf->abort = false;
443894e2e912 Block commit of eCos version 1.2.1
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parents:
diff changeset
459 cbuf->waiting = false;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
460 res = -EINTR;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
461 break;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
462 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
463 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
464 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
465 cyg_drv_dsr_unlock();
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
466 }
82
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parents: 66
diff changeset
467 #ifdef XX_CYGDBG_DIAG_BUF
20
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parents: 4
diff changeset
468 cyg_drv_isr_lock();
82
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parents: 66
diff changeset
469 enable_diag_uart = 0;
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parents: 66
diff changeset
470 HAL_CLOCK_READ(&_time);
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diff changeset
471 _stime = (int)cyg_current_time();
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diff changeset
472 diag_printf("READ done - size: %d, len: %d, time: %x.%x\n", size, *len, _stime, _time);
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diff changeset
473 enable_diag_uart = _enable;
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diff changeset
474 cyg_drv_isr_unlock();
20
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parents: 4
diff changeset
475 #endif // CYGDBG_DIAG_BUF
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
476 cyg_drv_mutex_unlock(&cbuf->lock);
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
477 return res;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
478 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
479
115
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parents: 107
diff changeset
480
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diff changeset
481 // ---------------------------------------------------------------------------
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diff changeset
482
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diff changeset
483 static cyg_bool
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diff changeset
484 serial_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info)
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diff changeset
485 {
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diff changeset
486 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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diff changeset
487
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diff changeset
488 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
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diff changeset
489 serial_channel *chan = (serial_channel *)t->priv;
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diff changeset
490
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diff changeset
491
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diff changeset
492 switch( which )
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diff changeset
493 {
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diff changeset
494 case CYG_FREAD:
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diff changeset
495 {
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diff changeset
496 cbuf_t *cbuf = &chan->in_cbuf;
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diff changeset
497
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diff changeset
498 // Check for data in the input buffer. If there is none,
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diff changeset
499 // register the select operation, otherwise return true.
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diff changeset
500
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diff changeset
501 if( cbuf->nb == 0 )
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diff changeset
502 cyg_selrecord( info, &cbuf->selinfo );
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diff changeset
503 else return true;
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parents: 107
diff changeset
504 }
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parents: 107
diff changeset
505 break;
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jlarmour
parents: 107
diff changeset
506
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jlarmour
parents: 107
diff changeset
507 case CYG_FWRITE:
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jlarmour
parents: 107
diff changeset
508 {
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jlarmour
parents: 107
diff changeset
509 // Check for space in the output buffer. If there is none,
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diff changeset
510 // register the select operation, otherwise return true.
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diff changeset
511
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diff changeset
512 cbuf_t *cbuf = &chan->out_cbuf;
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diff changeset
513 int space = cbuf->len - cbuf->nb;
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diff changeset
514 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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diff changeset
515 if ( (space < cbuf->low_water) ||
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diff changeset
516 (chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) )
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diff changeset
517 cyg_selrecord( info, &cbuf->selinfo );
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parents: 107
diff changeset
518 #else
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parents: 107
diff changeset
519 if (space < cbuf->low_water)
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diff changeset
520 cyg_selrecord( info, &cbuf->selinfo );
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diff changeset
521 #endif
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parents: 107
diff changeset
522 else return true;
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parents: 107
diff changeset
523 }
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jlarmour
parents: 107
diff changeset
524 break;
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jlarmour
parents: 107
diff changeset
525
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jlarmour
parents: 107
diff changeset
526 case 0: // exceptions - none supported
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jlarmour
parents: 107
diff changeset
527 break;
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jlarmour
parents: 107
diff changeset
528 }
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jlarmour
parents: 107
diff changeset
529 return false;
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jlarmour
parents: 107
diff changeset
530 #else
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parents: 107
diff changeset
531
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jlarmour
parents: 107
diff changeset
532 // With no select support, we simply return true.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
533 return true;
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parents: 107
diff changeset
534 #endif
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
535 }
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jlarmour
parents: 107
diff changeset
536
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
537
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
538 // ---------------------------------------------------------------------------
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jlarmour
parents: 107
diff changeset
539
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
540 static Cyg_ErrNo
128
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
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parents: 115
diff changeset
541 serial_get_config(cyg_io_handle_t handle, cyg_uint32 key, void *xbuf,
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 115
diff changeset
542 cyg_uint32 *len)
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
543 {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
544 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
545 serial_channel *chan = (serial_channel *)t->priv;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
546 cyg_serial_info_t *buf = (cyg_serial_info_t *)xbuf;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
547 Cyg_ErrNo res = ENOERR;
86
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parents: 82
diff changeset
548 cbuf_t *out_cbuf = &chan->out_cbuf;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
549 cbuf_t *in_cbuf = &chan->in_cbuf;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
550 serial_funs *funs = chan->funs;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
551
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
552 switch (key) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
553 case CYG_IO_GET_CONFIG_SERIAL_INFO:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
554 if (*len < sizeof(cyg_serial_info_t)) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
555 return -EINVAL;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
556 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
557 *buf = chan->config;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
558 *len = sizeof(chan->config);
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
559 break;
86
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jlarmour
parents: 82
diff changeset
560
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
561 case CYG_IO_GET_CONFIG_SERIAL_BUFFER_INFO:
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jlarmour
parents: 82
diff changeset
562 // return rx/tx buffer sizes and counts
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jlarmour
parents: 82
diff changeset
563 {
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jlarmour
parents: 82
diff changeset
564 cyg_serial_buf_info_t *p;
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jlarmour
parents: 82
diff changeset
565 if (*len < sizeof(cyg_serial_buf_info_t))
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jlarmour
parents: 82
diff changeset
566 return -EINVAL;
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jlarmour
parents: 82
diff changeset
567
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
568 *len = sizeof(cyg_serial_buf_info_t);
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jlarmour
parents: 82
diff changeset
569 p = (cyg_serial_buf_info_t *)xbuf;
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jlarmour
parents: 82
diff changeset
570
88
afdeb44241de Merge from eCos master repository on 2000-05-12-07:47:04-BST
jlarmour
parents: 86
diff changeset
571 p->rx_bufsize = in_cbuf->len;
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
572 if (p->rx_bufsize)
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jlarmour
parents: 107
diff changeset
573 p->rx_count = in_cbuf->nb;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
574 else
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
575 p->rx_count = 0;
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jlarmour
parents: 82
diff changeset
576
88
afdeb44241de Merge from eCos master repository on 2000-05-12-07:47:04-BST
jlarmour
parents: 86
diff changeset
577 p->tx_bufsize = out_cbuf->len;
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
578 if (p->tx_bufsize)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
579 p->tx_count = out_cbuf->nb;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
580 else
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
581 p->tx_count = 0;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
582 }
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
583 break;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
584
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
585 case CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
586 // Wait for any pending output to complete
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
587 if (out_cbuf->len == 0) break; // Nothing to do if not buffered
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
588 cyg_drv_mutex_lock(&out_cbuf->lock); // Stop any further output processing
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
589 cyg_drv_dsr_lock();
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
590 while (out_cbuf->pending || (out_cbuf->nb > 0)) {
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
591 out_cbuf->waiting = true;
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
592 if(!cyg_drv_cond_wait(&out_cbuf->wait) )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
593 res = -EINTR;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
594 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
595 cyg_drv_dsr_unlock();
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
596 cyg_drv_mutex_unlock(&out_cbuf->lock);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
597 break;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
598
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
599 case CYG_IO_GET_CONFIG_SERIAL_INPUT_FLUSH:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
600 // Flush any buffered input
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
601 if (in_cbuf->len == 0) break; // Nothing to do if not buffered
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
602 cyg_drv_mutex_lock(&in_cbuf->lock); // Stop any further input processing
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
603 cyg_drv_dsr_lock();
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
604 if (in_cbuf->waiting) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
605 in_cbuf->abort = true;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
606 cyg_drv_cond_signal(&in_cbuf->wait);
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
607 in_cbuf->waiting = false;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
608 }
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
609 in_cbuf->get = in_cbuf->put = in_cbuf->nb = 0; // Flush buffered input
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
610 cyg_drv_dsr_unlock();
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
611 cyg_drv_mutex_unlock(&in_cbuf->lock);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
612 break;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
613
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
614 case CYG_IO_GET_CONFIG_SERIAL_ABORT:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
615 // Abort any outstanding I/O, including blocked reads
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
616 // Caution - assumed to be called from 'timeout' (i.e. DSR) code
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
617 if (in_cbuf->len != 0) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
618 in_cbuf->abort = true;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
619 cyg_drv_cond_signal(&in_cbuf->wait);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
620 }
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
621 if (out_cbuf->len != 0) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
622 out_cbuf->abort = true;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
623 cyg_drv_cond_signal(&out_cbuf->wait);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
624 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
625 break;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
626
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
627 case CYG_IO_GET_CONFIG_SERIAL_OUTPUT_FLUSH:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
628 // Throw away any pending output
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
629 if (out_cbuf->len == 0) break; // Nothing to do if not buffered
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
630 cyg_drv_mutex_lock(&out_cbuf->lock); // Stop any further output processing
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
631 cyg_drv_dsr_lock();
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
632 if (out_cbuf->nb > 0) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
633 out_cbuf->get = out_cbuf->put = out_cbuf->nb = 0; // Empties queue!
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
634 (funs->stop_xmit)(chan); // Done with transmit
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
635 }
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
636 if (out_cbuf->waiting) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
637 out_cbuf->abort = true;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
638 cyg_drv_cond_signal(&out_cbuf->wait);
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
639 out_cbuf->waiting = false;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
640 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
641 cyg_drv_dsr_unlock();
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
642 cyg_drv_mutex_unlock(&out_cbuf->lock);
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
643 break;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
644
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
645 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
646 case CYG_IO_GET_CONFIG_READ_BLOCKING:
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
647 if (*len < sizeof(cyg_uint32)) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
648 return -EINVAL;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
649 }
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
650 *(cyg_uint32*)xbuf = (in_cbuf->blocking) ? 1 : 0;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
651 break;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
652
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
653 case CYG_IO_GET_CONFIG_WRITE_BLOCKING:
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
654 if (*len < sizeof(cyg_uint32)) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
655 return -EINVAL;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
656 }
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
657 *(cyg_uint32*)xbuf = (out_cbuf->blocking) ? 1 : 0;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
658 break;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
659 #endif // CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
660
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
661 default:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
662 res = -EINVAL;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
663 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
664 return res;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
665 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
666
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
667
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
668 // ---------------------------------------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
669
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
670 static Cyg_ErrNo
128
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 115
diff changeset
671 serial_set_config(cyg_io_handle_t handle, cyg_uint32 key, const void *xbuf,
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 115
diff changeset
672 cyg_uint32 *len)
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
673 {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
674 Cyg_ErrNo res = ENOERR;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
675 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
676 serial_channel *chan = (serial_channel *)t->priv;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
677 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
678 cbuf_t *out_cbuf = &chan->out_cbuf;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
679 cbuf_t *in_cbuf = &chan->in_cbuf;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
680 #endif
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
681 serial_funs *funs = chan->funs;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
682
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
683 switch (key) {
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
684 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
685 case CYG_IO_SET_CONFIG_READ_BLOCKING:
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
686 if (*len < sizeof(cyg_uint32) || 0 == in_cbuf->len) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
687 return -EINVAL;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
688 }
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
689 in_cbuf->blocking = (1 == *(cyg_uint32*)xbuf) ? true : false;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
690 break;
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
691 case CYG_IO_SET_CONFIG_WRITE_BLOCKING:
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
692 if (*len < sizeof(cyg_uint32) || 0 == out_cbuf->len) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
693 return -EINVAL;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
694 }
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
695 out_cbuf->blocking = (1 == *(cyg_uint32*)xbuf) ? true : false;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
696 break;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
697 #endif // CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
698
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
699 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
700 case CYG_IO_SET_CONFIG_SERIAL_FLOW_CONTROL_METHOD:
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
701 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
702 cyg_uint32 *f = (cyg_uint32 *)xbuf;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
703
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
704 if (*len < sizeof(*f))
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
705 return -EINVAL;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
706
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
707 cyg_drv_dsr_lock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
708
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
709 chan->config.flags &= ~(CYGNUM_SERIAL_FLOW_XONXOFF_RX|
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
710 CYGNUM_SERIAL_FLOW_XONXOFF_TX|
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
711 CYGNUM_SERIAL_FLOW_RTSCTS_RX|
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
712 CYGNUM_SERIAL_FLOW_RTSCTS_TX|
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
713 CYGNUM_SERIAL_FLOW_DSRDTR_RX|
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
714 CYGNUM_SERIAL_FLOW_DSRDTR_TX);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
715 chan->config.flags |= (*f & (
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
716 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
717 CYGNUM_SERIAL_FLOW_XONXOFF_RX|
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parents: 107
diff changeset
718 CYGNUM_SERIAL_FLOW_XONXOFF_TX|
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parents: 107
diff changeset
719 #endif
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parents: 107
diff changeset
720 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
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parents: 107
diff changeset
721 CYGNUM_SERIAL_FLOW_RTSCTS_RX|
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parents: 107
diff changeset
722 CYGNUM_SERIAL_FLOW_RTSCTS_TX|
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parents: 107
diff changeset
723 CYGNUM_SERIAL_FLOW_DSRDTR_RX|
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parents: 107
diff changeset
724 CYGNUM_SERIAL_FLOW_DSRDTR_TX|
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diff changeset
725 #endif
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parents: 107
diff changeset
726 0));
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parents: 107
diff changeset
727 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
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parents: 107
diff changeset
728 // up to hardware driver to clear flags if rejected
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parents: 107
diff changeset
729 res = (funs->set_config)(chan,
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parents: 107
diff changeset
730 CYG_IO_SET_CONFIG_SERIAL_HW_FLOW_CONFIG,
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parents: 107
diff changeset
731 NULL, NULL);
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parents: 107
diff changeset
732 #endif
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diff changeset
733 cyg_drv_dsr_unlock();
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parents: 107
diff changeset
734 }
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jlarmour
parents: 107
diff changeset
735 break;
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jlarmour
parents: 107
diff changeset
736
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parents: 107
diff changeset
737 case CYG_IO_SET_CONFIG_SERIAL_FLOW_CONTROL_FORCE:
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diff changeset
738 {
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diff changeset
739 cyg_uint32 *f = (cyg_uint32 *)xbuf;
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diff changeset
740
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parents: 107
diff changeset
741 if (*len < sizeof(*f))
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parents: 107
diff changeset
742 return -EINVAL;
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parents: 107
diff changeset
743
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diff changeset
744 cyg_drv_dsr_lock();
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parents: 107
diff changeset
745 switch (*f) {
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parents: 107
diff changeset
746 case CYGNUM_SERIAL_FLOW_THROTTLE_RX:
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parents: 107
diff changeset
747 throttle_rx( chan, true );
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parents: 107
diff changeset
748 break;
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parents: 107
diff changeset
749 case CYGNUM_SERIAL_FLOW_RESTART_RX:
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parents: 107
diff changeset
750 restart_rx( chan, true );
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parents: 107
diff changeset
751 break;
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parents: 107
diff changeset
752 case CYGNUM_SERIAL_FLOW_THROTTLE_TX:
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diff changeset
753 throttle_tx( chan );
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diff changeset
754 break;
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diff changeset
755 case CYGNUM_SERIAL_FLOW_RESTART_TX:
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parents: 107
diff changeset
756 restart_tx( chan );
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diff changeset
757 break;
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parents: 107
diff changeset
758 default:
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diff changeset
759 res = -EINVAL;
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diff changeset
760 break;
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parents: 107
diff changeset
761 }
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diff changeset
762 cyg_drv_dsr_unlock();
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parents: 107
diff changeset
763 }
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diff changeset
764 break;
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diff changeset
765 #endif // CYGPKG_IO_SERIAL_FLOW_CONTROL
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diff changeset
766
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diff changeset
767 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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diff changeset
768 case CYG_IO_SET_CONFIG_SERIAL_STATUS_CALLBACK:
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diff changeset
769 {
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diff changeset
770 cyg_serial_line_status_callback_fn_t newfn;
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diff changeset
771 CYG_ADDRWORD newpriv;
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diff changeset
772 cyg_serial_line_status_callback_t *tmp =
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diff changeset
773 (cyg_serial_line_status_callback_t *)xbuf;
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diff changeset
774
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diff changeset
775 if ( *len < sizeof(*tmp) )
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diff changeset
776 return -EINVAL;
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diff changeset
777
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diff changeset
778 newfn = tmp->fn;
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diff changeset
779 newpriv = tmp->priv;
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diff changeset
780
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diff changeset
781 // prevent callbacks while we do this
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diff changeset
782 cyg_drv_dsr_lock();
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diff changeset
783 // store old callbacks in same structure
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diff changeset
784 tmp->fn = chan->status_callback;
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diff changeset
785 tmp->priv = chan->status_callback_priv;
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diff changeset
786 chan->status_callback = newfn;
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diff changeset
787 chan->status_callback_priv = newpriv;
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parents: 107
diff changeset
788 cyg_drv_dsr_unlock();
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parents: 107
diff changeset
789 *len = sizeof(*tmp);
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jlarmour
parents: 107
diff changeset
790 }
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jlarmour
parents: 107
diff changeset
791 break;
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jlarmour
parents: 107
diff changeset
792 #endif
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diff changeset
793
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
794 default:
115
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parents: 107
diff changeset
795 // pass down to lower layers
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parents: 107
diff changeset
796 return (funs->set_config)(chan, key, xbuf, len);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
797 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
798 return res;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
799 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
800
115
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parents: 107
diff changeset
801 // ---------------------------------------------------------------------------
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parents: 107
diff changeset
802
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
803 static void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
804 serial_xmt_char(serial_channel *chan)
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
805 {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
806 cbuf_t *cbuf = &chan->out_cbuf;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
807 serial_funs *funs = chan->funs;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
808 unsigned char c;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
809 int space;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
810
128
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
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parents: 115
diff changeset
811 #if CYGINT_IO_SERIAL_BLOCK_TRANSFER
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
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parents: 115
diff changeset
812 CYG_ASSERT(false == cbuf->block_mode_xfer_running,
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jlarmour
parents: 115
diff changeset
813 "Attempting char xmt while block transfer is running");
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jlarmour
parents: 115
diff changeset
814 #endif
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
815 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
128
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
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parents: 115
diff changeset
816 // if we are required to send an XON/XOFF char, send it before
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parents: 115
diff changeset
817 // anything else
115
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parents: 107
diff changeset
818 // FIXME: what if XON gets corrupted in transit to the other end?
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parents: 107
diff changeset
819 // Should we resend XON even though the other end may not be wanting
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jlarmour
parents: 107
diff changeset
820 // to send us stuff at this point?
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parents: 107
diff changeset
821 if ( chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_RX ) {
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jlarmour
parents: 107
diff changeset
822 if ( chan->flow_desc.xchar ) {
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jlarmour
parents: 107
diff changeset
823 if ( (funs->putc)(chan, chan->flow_desc.xchar) ) {
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jlarmour
parents: 107
diff changeset
824 chan->flow_desc.xchar = '\0';
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jlarmour
parents: 107
diff changeset
825 } else { // otherwise there's no space and we have to wait
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jlarmour
parents: 107
diff changeset
826 return;
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jlarmour
parents: 107
diff changeset
827 }
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jlarmour
parents: 107
diff changeset
828 }
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jlarmour
parents: 107
diff changeset
829 }
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jlarmour
parents: 107
diff changeset
830 #endif
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jlarmour
parents: 107
diff changeset
831 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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jlarmour
parents: 107
diff changeset
832 // if we're meant to be throttled, just stop and leave
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jlarmour
parents: 107
diff changeset
833 if ( chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED ) {
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jlarmour
parents: 107
diff changeset
834 (funs->stop_xmit)(chan); // Stop transmitting for now
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jlarmour
parents: 107
diff changeset
835 return;
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jlarmour
parents: 107
diff changeset
836 }
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jlarmour
parents: 107
diff changeset
837 #endif
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jlarmour
parents: 107
diff changeset
838 while (cbuf->nb > 0) {
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
839 c = cbuf->data[cbuf->get];
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
840 if ((funs->putc)(chan, c)) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
841 cbuf->get++;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
842 if (cbuf->get == cbuf->len) cbuf->get = 0;
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
843 cbuf->nb--;
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jlarmour
parents: 107
diff changeset
844 } else {
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jlarmour
parents: 107
diff changeset
845 // See if there is now enough room to restart writer
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jlarmour
parents: 107
diff changeset
846 space = cbuf->len - cbuf->nb;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
847 if (space >= cbuf->low_water) {
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jlarmour
parents: 107
diff changeset
848 if (cbuf->waiting) {
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
849 cbuf->waiting = false;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
850 cyg_drv_cond_broadcast(&cbuf->wait);
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
851 }
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
852 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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jlarmour
parents: 107
diff changeset
853 cyg_selwakeup( &cbuf->selinfo );
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parents: 107
diff changeset
854 #endif
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
855 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
856 return; // Need to wait for more space
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
857 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
858 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
859 (funs->stop_xmit)(chan); // Done with transmit
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
860
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
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diff changeset
861 // must signal waiters, and wake up selecters for the case when
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diff changeset
862 // this was the last char to be sent and they hadn't been signalled
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diff changeset
863 // before (e.g. because of flow control)
2
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864 if (cbuf->waiting) {
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diff changeset
865 cbuf->waiting = false;
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diff changeset
866 cyg_drv_cond_signal(&cbuf->wait);
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parents:
diff changeset
867 }
115
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diff changeset
868 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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diff changeset
869 cyg_selwakeup( &cbuf->selinfo );
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diff changeset
870 #endif
2
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diff changeset
871 }
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872
115
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diff changeset
873 // ---------------------------------------------------------------------------
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diff changeset
874
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diff changeset
875 static void
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parents:
diff changeset
876 serial_rcv_char(serial_channel *chan, unsigned char c)
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parents:
diff changeset
877 {
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parents:
diff changeset
878 cbuf_t *cbuf = &chan->in_cbuf;
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parents:
diff changeset
879
128
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diff changeset
880 #if CYGINT_IO_SERIAL_BLOCK_TRANSFER
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diff changeset
881 CYG_ASSERT(false == cbuf->block_mode_xfer_running,
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diff changeset
882 "Attempting char rcv while block transfer is running");
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diff changeset
883 #endif
115
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diff changeset
884 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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diff changeset
885 // for software flow control, if the driver returns one of the characters
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diff changeset
886 // we act on it and then drop it (the app must not see it)
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diff changeset
887 if ( chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_TX ) {
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888 if ( c == CYGDAT_IO_SERIAL_FLOW_CONTROL_XOFF_CHAR ) {
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diff changeset
889 throttle_tx( chan );
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diff changeset
890 return; // it wasn't a "real" character
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diff changeset
891 } else if ( c == CYGDAT_IO_SERIAL_FLOW_CONTROL_XON_CHAR ) {
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diff changeset
892 restart_tx( chan );
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diff changeset
893 return; // it wasn't a "real" character
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diff changeset
894 }
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diff changeset
895 }
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diff changeset
896 #endif
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diff changeset
897 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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diff changeset
898 // If we've hit the high water mark, tell the other side to stop
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diff changeset
899 if ( cbuf->nb >= cbuf->high_water ) {
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diff changeset
900 throttle_rx( chan, false );
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diff changeset
901 }
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diff changeset
902 #endif
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diff changeset
903 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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diff changeset
904 // Wake up any pending selectors if we are about to
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diff changeset
905 // put some data into a previously empty buffer.
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diff changeset
906 if( cbuf->nb == 0 )
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diff changeset
907 cyg_selwakeup( &cbuf->selinfo );
86
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diff changeset
908 #endif
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diff changeset
909
115
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diff changeset
910 // If the flow control is not enabled/sufficient and the buffer is
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diff changeset
911 // already full, just throw new characters away.
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diff changeset
912
128
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diff changeset
913 if ( cbuf->nb < cbuf->len ) {
115
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diff changeset
914 cbuf->data[cbuf->put++] = c;
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diff changeset
915 if (cbuf->put == cbuf->len) cbuf->put = 0;
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diff changeset
916 cbuf->nb++;
128
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diff changeset
917 } // note trailing else
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diff changeset
918 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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diff changeset
919 else {
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diff changeset
920 // Overrun. Report the error.
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diff changeset
921 cyg_serial_line_status_t stat;
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diff changeset
922 stat.which = CYGNUM_SERIAL_STATUS_OVERRUNERR;
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diff changeset
923 serial_indicate_status(chan, &stat);
115
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diff changeset
924 }
128
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diff changeset
925 #endif
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diff changeset
926
2
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diff changeset
927 if (cbuf->waiting) {
20
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diff changeset
928 #ifdef XX_CYGDBG_DIAG_BUF
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diff changeset
929 extern int enable_diag_uart;
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parents: 4
diff changeset
930 int _enable = enable_diag_uart;
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parents: 4
diff changeset
931 int _time, _stime;
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parents: 4
diff changeset
932 externC cyg_tick_count_t cyg_current_time(void);
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parents: 4
diff changeset
933 enable_diag_uart = 0;
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diff changeset
934 HAL_CLOCK_READ(&_time);
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diff changeset
935 _stime = (int)cyg_current_time();
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parents: 4
diff changeset
936 diag_printf("Signal reader - time: %x.%x\n", _stime, _time);
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parents: 4
diff changeset
937 enable_diag_uart = _enable;
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parents: 4
diff changeset
938 #endif // CYGDBG_DIAG_BUF
2
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parents:
diff changeset
939 cbuf->waiting = false;
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jlarmour
parents:
diff changeset
940 cyg_drv_cond_signal(&cbuf->wait);
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parents:
diff changeset
941 }
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parents:
diff changeset
942 }
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diff changeset
943
86
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diff changeset
944 //----------------------------------------------------------------------------
115
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diff changeset
945 // Flow control indication callback
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diff changeset
946
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diff changeset
947 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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diff changeset
948 static void
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diff changeset
949 serial_indicate_status(serial_channel *chan, cyg_serial_line_status_t *s )
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diff changeset
950 {
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diff changeset
951 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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diff changeset
952 if ( CYGNUM_SERIAL_STATUS_FLOW == s->which ) {
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diff changeset
953 if ( s->value )
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diff changeset
954 restart_tx( chan );
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diff changeset
955 else
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diff changeset
956 throttle_tx( chan );
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diff changeset
957 }
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diff changeset
958 #endif
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diff changeset
959 if ( chan->status_callback )
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parents: 107
diff changeset
960 (*chan->status_callback)(s, chan->status_callback_priv);
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diff changeset
961 }
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diff changeset
962 #endif // ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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diff changeset
963
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diff changeset
964 //----------------------------------------------------------------------------
128
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diff changeset
965 // Block transfer functions. Not all drivers require these. Those that
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diff changeset
966 // do must follow the required semantics:
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diff changeset
967 //
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diff changeset
968 // Attempt to transfer as much via the block transfer function as
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diff changeset
969 // possible, _but_ if that fails, do the remaining bytes via the
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diff changeset
970 // single-char function. That ensures that all policy decisions can be
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diff changeset
971 // made in this driver, and not in the device driver.
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diff changeset
972 //
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diff changeset
973 // Note: if the driver uses DMA for transmission, an initial failing
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diff changeset
974 // call to the xmt_req function must cause the start_xmit function to
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diff changeset
975 // fall-back to regular CPU-interrupt based single-character
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diff changeset
976 // transmission.
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diff changeset
977
115
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diff changeset
978 #if CYGINT_IO_SERIAL_BLOCK_TRANSFER
86
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diff changeset
979
128
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diff changeset
980 static rcv_req_reply_t
86
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diff changeset
981 serial_data_rcv_req(serial_channel *chan, int avail,
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diff changeset
982 int* space_avail, unsigned char** space)
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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diff changeset
983 {
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diff changeset
984 cbuf_t *cbuf = &chan->in_cbuf;
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diff changeset
985 int gap;
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parents: 82
diff changeset
986
128
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diff changeset
987 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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diff changeset
988 // When there is software flow-control, force the serial device
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parents: 115
diff changeset
989 // driver to use the single-char xmt/rcv functions, since these
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diff changeset
990 // have to make policy decision based on the data. Rcv function
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diff changeset
991 // may also have to transmit data to throttle the xmitter.
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diff changeset
992 if (chan->config.flags & (CYGNUM_SERIAL_FLOW_XONXOFF_TX|CYGNUM_SERIAL_FLOW_XONXOFF_RX))
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diff changeset
993 return CYG_RCV_DISABLED;
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parents: 115
diff changeset
994 #endif
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parents: 115
diff changeset
995
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diff changeset
996 CYG_ASSERT(false == cbuf->block_mode_xfer_running,
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
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diff changeset
997 "Attempting new block transfer while another is running");
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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diff changeset
998 // Check for space
115
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diff changeset
999 gap = cbuf->nb;
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1000 if (gap == cbuf->len)
128
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1001 return CYG_RCV_FULL;
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diff changeset
1002
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diff changeset
1003 #ifdef CYGDBG_USE_ASSERTS
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diff changeset
1004 cbuf->block_mode_xfer_running = true;
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diff changeset
1005 #endif
86
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diff changeset
1006
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diff changeset
1007 if (0 == gap) {
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diff changeset
1008 // Buffer is empty. Reset put/get indexes to get max transfer in
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diff changeset
1009 // one chunk.
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diff changeset
1010 cbuf->get = 0;
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diff changeset
1011 cbuf->put = 0;
115
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diff changeset
1012 gap = cbuf->len;
86
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1013 } else {
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1014 // Free space (G = get, P = put, x = data, . = empty)
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1015 // positive: xxxxP.....Gxxx
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1016 // negative: ..GxxxxxP..... [offer last chunk only]
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1017
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1018 // First try for a gap between put and get locations
115
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1019 gap = cbuf->get - cbuf->put;
86
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1020 if (gap < 0) {
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diff changeset
1021 // If failed, the gap is between put and the end of buffer
107
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1022 gap = cbuf->len - cbuf->put;
86
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1023 }
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1024 }
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diff changeset
1025
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1026 if (avail < gap) gap = avail; // bound by what's available from hw
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diff changeset
1027
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diff changeset
1028 *space_avail = gap;
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1029 *space = &cbuf->data[cbuf->put];
128
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1030
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1031 CYG_ASSERT((gap+cbuf->nb) <= cbuf->len, "Buffer will overflow");
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1032 CYG_ASSERT(cbuf->put < cbuf->len, "Invalid put ptr");
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1033 CYG_ASSERT(cbuf->get < cbuf->len, "Invalid get ptr");
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diff changeset
1034
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1035 return CYG_RCV_OK;
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1036 }
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diff changeset
1037
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1038 static void
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diff changeset
1039 serial_data_rcv_done(serial_channel *chan, int chars_rcvd)
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1040 {
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1041 cbuf_t *cbuf = &chan->in_cbuf;
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diff changeset
1042
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1043 cbuf->put += chars_rcvd;
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diff changeset
1044 cbuf->nb += chars_rcvd;
86
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diff changeset
1045
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1046 if (cbuf->put == cbuf->len) cbuf->put = 0;
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1047
128
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1048 CYG_ASSERT(cbuf->nb <= cbuf->len, "Buffer overflow");
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diff changeset
1049 CYG_ASSERT(cbuf->put < cbuf->len, "Invalid put ptr");
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1050 CYG_ASSERT(cbuf->get < cbuf->len, "Invalid get ptr");
86
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diff changeset
1051
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diff changeset
1052 if (cbuf->waiting) {
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diff changeset
1053 cbuf->waiting = false;
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diff changeset
1054 cyg_drv_cond_signal(&cbuf->wait);
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1055 }
128
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diff changeset
1056 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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1057 // If we've hit the high water mark, tell the other side to stop
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1058 if ( cbuf->nb >= cbuf->high_water ) {
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1059 throttle_rx( chan, false );
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1060 }
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1061 #endif
115
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diff changeset
1062 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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1063 // Wake up any pending selectors if we have
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diff changeset
1064 // put some data into a previously empty buffer.
128
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diff changeset
1065 if (chars_rcvd == cbuf->nb)
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diff changeset
1066 cyg_selwakeup( &cbuf->selinfo );
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1067 #endif
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diff changeset
1068
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1069 #ifdef CYGDBG_USE_ASSERTS
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1070 cbuf->block_mode_xfer_running = false;
115
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1071 #endif
86
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1072 }
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diff changeset
1073
128
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diff changeset
1074 static xmt_req_reply_t
86
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diff changeset
1075 serial_data_xmt_req(serial_channel *chan, int space,
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1076 int* chars_avail, unsigned char** chars)
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diff changeset
1077 {
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1078 cbuf_t *cbuf = &chan->out_cbuf;
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1079 int avail;
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1080
128
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diff changeset
1081 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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1082 // When there is software flow-control, force the serial device
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1083 // driver to use the single-char xmt/rcv functions, since these
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1084 // have to make policy decision based on the data. Rcv function
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1085 // may also have to transmit data to throttle the xmitter.
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1086 if (chan->config.flags & (CYGNUM_SERIAL_FLOW_XONXOFF_TX|CYGNUM_SERIAL_FLOW_XONXOFF_RX))
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1087 return CYG_XMT_DISABLED;
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diff changeset
1088 #endif
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diff changeset
1089
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diff changeset
1090 CYG_ASSERT(false == cbuf->block_mode_xfer_running,
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diff changeset
1091 "Attempting new block transfer while another is running");
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diff changeset
1092
86
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1093 // Available data (G = get, P = put, x = data, . = empty)
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diff changeset
1094 // 0: no data
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diff changeset
1095 // negative: xxxxP.....Gxxx [offer last chunk only]
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diff changeset
1096 // positive: ..GxxxxxP.....
115
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diff changeset
1097 if (0 == cbuf->nb)
128
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diff changeset
1098 return CYG_XMT_EMPTY;
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diff changeset
1099
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diff changeset
1100 #ifdef CYGDBG_USE_ASSERTS
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diff changeset
1101 cbuf->block_mode_xfer_running = true;
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diff changeset
1102 #endif
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1103
115
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diff changeset
1104 if (cbuf->get >= cbuf->put) {
86
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1105 avail = cbuf->len - cbuf->get;
115
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diff changeset
1106 } else {
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diff changeset
1107 avail = cbuf->put - cbuf->get;
86
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1108 }
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diff changeset
1109
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1110 if (avail > space) avail = space; // bound by space in hardware
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1111
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1112 *chars_avail = avail;
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1113 *chars = &cbuf->data[cbuf->get];
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1114
128
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diff changeset
1115 CYG_ASSERT(avail <= cbuf->len, "Avail overflow");
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1116 CYG_ASSERT(cbuf->nb <= cbuf->len, "Buffer overflow");
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1117 CYG_ASSERT(cbuf->put < cbuf->len, "Invalid put ptr");
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1118 CYG_ASSERT(cbuf->get < cbuf->len, "Invalid get ptr");
86
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1119
128
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1120 return CYG_XMT_OK;
86
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1121 }
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1122
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1123 static void
128
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1124 serial_data_xmt_done(serial_channel *chan, int chars_sent)
86
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diff changeset
1125 {
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1126 cbuf_t *cbuf = &chan->out_cbuf;
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1127 serial_funs *funs = chan->funs;
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diff changeset
1128 int space;
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1129
128
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1130 cbuf->get += chars_sent;
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1131 cbuf->nb -= chars_sent;
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diff changeset
1132
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1133 if (cbuf->get == cbuf->len) cbuf->get = 0;
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1134
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1135 CYG_ASSERT(cbuf->nb <= cbuf->len, "Buffer overflow");
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1136 CYG_ASSERT(cbuf->nb >= 0, "Buffer underflow");
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1137 CYG_ASSERT(cbuf->put < cbuf->len, "Invalid put ptr");
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1138 CYG_ASSERT(cbuf->get < cbuf->len, "Invalid get ptr");
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1139
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1140 if (0 == cbuf->nb) {
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1141 (funs->stop_xmit)(chan); // Done with transmit
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1142 cbuf->get = cbuf->put = 0; // reset ptrs if empty
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1143 }
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1144
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1145 // See if there is now enough room to restart writer
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1146 space = cbuf->len - cbuf->nb;
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1147 if (space >= cbuf->low_water) {
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1148 if (cbuf->waiting) {
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1149 cbuf->waiting = false;
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1150 cyg_drv_cond_broadcast(&cbuf->wait);
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1151 }
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1152 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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1153 cyg_selwakeup( &cbuf->selinfo );
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1154 #endif
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1155 }
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1156
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1157 #ifdef CYGDBG_USE_ASSERTS
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1158 cbuf->block_mode_xfer_running = false;
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1159 #endif
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1160 }
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1161
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1162 #endif // CYGINT_IO_SERIAL_BLOCK_TRANSFER
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1163
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1164 // ---------------------------------------------------------------------------
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1165
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1166 // EOF serial.c