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annotate packages/io/serial/current/src/common/serial.c @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents 7f461c3a372c
children 0c2b7be0d798
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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/diag.h>
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51
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52 static Cyg_ErrNo serial_write(cyg_io_handle_t handle, const void *buf, cyg_uint32 *len);
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53 static Cyg_ErrNo serial_read(cyg_io_handle_t handle, void *buf, cyg_uint32 *len);
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54 static Cyg_ErrNo serial_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info);
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55 static Cyg_ErrNo serial_get_config(cyg_io_handle_t handle, cyg_uint32 key, void *buf, cyg_uint32 *len);
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56 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 DEVIO_TABLE(cyg_io_serial_devio,
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59 serial_write,
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60 serial_read,
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61 serial_select,
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62 serial_get_config,
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63 serial_set_config
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64 );
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65
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66 static void serial_init(serial_channel *chan);
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67 static void serial_xmt_char(serial_channel *chan);
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68 static void serial_rcv_char(serial_channel *chan, unsigned char c);
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69 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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70 static void serial_indicate_status(serial_channel *chan,
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71 cyg_serial_line_status_t *s);
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72 #endif
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73 #if CYGINT_IO_SERIAL_BLOCK_TRANSFER
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74 static bool serial_data_rcv_req(serial_channel *chan, int avail,
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75 int* space_avail, unsigned char** space);
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76 static void serial_data_rcv_done(serial_channel *chan);
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77 static bool serial_data_xmt_req(serial_channel *chan, int space,
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78 int* chars_avail, unsigned char** chars);
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79 static void serial_data_xmt_done(serial_channel *chan);
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80 # ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
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81 SERIAL_CALLBACKS(cyg_io_serial_callbacks,
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82 serial_init,
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83 serial_xmt_char,
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84 serial_rcv_char,
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85 serial_data_rcv_req,
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86 serial_data_rcv_done,
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87 serial_data_xmt_req,
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88 serial_data_xmt_done,
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89 serial_indicate_status);
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90
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91 # else
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92 SERIAL_CALLBACKS(cyg_io_serial_callbacks,
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93 serial_init,
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94 serial_xmt_char,
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95 serial_rcv_char,
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96 serial_data_rcv_req,
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97 serial_data_rcv_done,
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98 serial_data_xmt_req,
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99 serial_data_xmt_done);
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100 # endif
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101 #else
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102 # ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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103 SERIAL_CALLBACKS(cyg_io_serial_callbacks,
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104 serial_init,
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105 serial_xmt_char,
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106 serial_rcv_char,
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107 serial_indicate_status);
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108 # else
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109 SERIAL_CALLBACKS(cyg_io_serial_callbacks,
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110 serial_init,
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111 serial_xmt_char,
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112 serial_rcv_char);
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113 # endif
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114 #endif
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115
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116 // ---------------------------------------------------------------------------
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117
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118 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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119
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120 static __inline__ void
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121 throttle_tx( serial_channel *chan )
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122 {
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123 chan->flow_desc.flags |= CYG_SERIAL_FLOW_OUT_THROTTLED;
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124 // the throttling itself occurs in the serial_xmt_char() callback
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125 }
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126
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127 static __inline__ void
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128 restart_tx( serial_channel *chan )
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129 {
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130 serial_funs *funs = chan->funs;
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131
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132 chan->flow_desc.flags &= ~CYG_SERIAL_FLOW_OUT_THROTTLED;
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133
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134 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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135 // See if there is now enough room to say it is available
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136 // for writing
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137 {
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138 cbuf_t *cbuf = &chan->out_cbuf;
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139 int space;
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140
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141 space = cbuf->len - cbuf->nb;
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142 if (space >= cbuf->low_water)
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143 cyg_selwakeup( &cbuf->selinfo );
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144 }
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145 #endif
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146 if ( chan->out_cbuf.nb > 0 )
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147 (funs->start_xmit)(chan);
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148 }
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149
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150 static __inline__ void
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151 throttle_rx( serial_channel *chan, cyg_bool force )
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152 {
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153 serial_funs *funs = chan->funs;
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154
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155 chan->flow_desc.flags |= CYG_SERIAL_FLOW_IN_THROTTLED;
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156 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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157 // send an xoff
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158 if ( force || chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_RX ) {
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159 chan->flow_desc.xchar = CYGDAT_IO_SERIAL_FLOW_CONTROL_XOFF_CHAR;
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160 // Make sure xmit is running so we can send it
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161 (funs->start_xmit)(chan);
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162 }
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163 #endif
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164 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
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165 {
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166 cyg_uint32 i=1;
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167 cyg_uint32 len = sizeof(i);
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168
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169 // set hardware flow control - don't care if it fails
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170 if ( force || (chan->config.flags & CYGNUM_SERIAL_FLOW_RTSCTS_RX) ||
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171 (chan->config.flags & CYGNUM_SERIAL_FLOW_DSRDTR_RX) )
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172 (funs->set_config)(chan,
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173 CYG_IO_SET_CONFIG_SERIAL_HW_RX_FLOW_THROTTLE,
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174 &i, &len);
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175 }
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176 #endif
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177 }
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178
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179 static __inline__ void
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180 restart_rx( serial_channel *chan, cyg_bool force )
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181 {
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182 serial_funs *funs = chan->funs;
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183
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184 chan->flow_desc.flags &= ~CYG_SERIAL_FLOW_IN_THROTTLED;
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185 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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186 // send an xon
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187 if ( force || chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_RX ) {
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188 chan->flow_desc.xchar = CYGDAT_IO_SERIAL_FLOW_CONTROL_XON_CHAR;
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189 (funs->start_xmit)(chan); // Make sure xmit is running so we can send it
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190 }
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191 #endif
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192 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
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193 {
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194 cyg_uint32 i=0;
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195 cyg_uint32 len = sizeof(i);
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196
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197 // set hardware flow control - don't care if it fails
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198 if ( force || (chan->config.flags & CYGNUM_SERIAL_FLOW_RTSCTS_RX) ||
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199 (chan->config.flags & CYGNUM_SERIAL_FLOW_DSRDTR_RX) )
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200 (funs->set_config)(chan,
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201 CYG_IO_SET_CONFIG_SERIAL_HW_RX_FLOW_THROTTLE,
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202 &i, &len);
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203 }
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204 #endif
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205 }
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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
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211 static void
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212 serial_init(serial_channel *chan)
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213 {
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214 if (chan->init) return;
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215 if (chan->out_cbuf.len != 0) {
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216 #ifdef CYGDBG_IO_INIT
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217 diag_printf("Set output buffer - buf: %x len: %d\n", chan->out_cbuf.data, chan->out_cbuf.len);
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218 #endif
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219 chan->out_cbuf.waiting = false;
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220 chan->out_cbuf.abort = false;
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221 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
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222 chan->out_cbuf.blocking = true;
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223 #endif
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224 chan->out_cbuf.pending = 0;
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225 cyg_drv_mutex_init(&chan->out_cbuf.lock);
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226 cyg_drv_cond_init(&chan->out_cbuf.wait, &chan->out_cbuf.lock);
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227 chan->out_cbuf.low_water = chan->out_cbuf.len / 4;
115
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228 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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229 cyg_selinit( &chan->out_cbuf.selinfo );
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230 #endif
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231 }
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232 if (chan->in_cbuf.len != 0) {
115
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233 cbuf_t *cbuf = &chan->in_cbuf;
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234
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235 #ifdef CYGDBG_IO_INIT
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236 diag_printf("Set input buffer - buf: %x len: %d\n", cbuf->data, cbuf->len);
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237 #endif
115
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238 cbuf->waiting = false;
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239 cbuf->abort = false;
86
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240 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
115
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241 cbuf->blocking = true;
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242 #endif
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243 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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244 cyg_selinit( &cbuf->selinfo );
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245 #endif
115
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246 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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247 cbuf->low_water =
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248 (CYGNUM_IO_SERIAL_FLOW_CONTROL_LOW_WATER_PERCENT * cbuf->len) / 100;
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249 cbuf->high_water =
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250 (CYGNUM_IO_SERIAL_FLOW_CONTROL_HIGH_WATER_PERCENT * cbuf->len) / 100;
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251 # ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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252 // But make sure it is at least 35 below buffer size, to allow
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253 // for 16 byte fifos, twice, plus some latency before s/w flow
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254 // control can kick in. This doesn't apply to h/w flow control
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255 // as it is near-instaneous
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256 if ( (cbuf->len - cbuf->high_water) < 35 )
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257 cbuf->high_water = cbuf->len - 35;
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258 // and just in case...
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259 if ( cbuf->high_water <= 0 )
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260 cbuf->high_water = 1;
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261 if ( cbuf->low_water > cbuf->high_water )
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262 cbuf->low_water = cbuf->high_water;
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263 # endif
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264 #endif
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265 cyg_drv_mutex_init(&cbuf->lock);
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266 cyg_drv_cond_init(&cbuf->wait, &cbuf->lock);
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267 }
115
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268 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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269 chan->status_callback = NULL;
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270 #endif
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271
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272 chan->init = true;
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273 }
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274
115
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275 // ---------------------------------------------------------------------------
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276 // FIXME:@@@ Throughout this file there are uses of cyg_drv_cond_signal and
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277 // cyg_drv_cond_broadcast. Does it matter which? -Jifl
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278
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279 static Cyg_ErrNo
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280 serial_write(cyg_io_handle_t handle, const void *_buf, cyg_uint32 *len)
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281 {
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282 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
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283 serial_channel *chan = (serial_channel *)t->priv;
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284 serial_funs *funs = chan->funs;
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285 cyg_int32 size = *len;
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286 cyg_uint8 *buf = (cyg_uint8 *)_buf;
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287 int next;
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288 cbuf_t *cbuf = &chan->out_cbuf;
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289 Cyg_ErrNo res = ENOERR;
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diff changeset
290
115
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291 cyg_drv_mutex_lock(&cbuf->lock);
4
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292 cbuf->abort = false;
86
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293
2
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294 if (cbuf->len == 0) {
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295 // Non interrupt driven (i.e. polled) operation
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296 while (size-- > 0) {
115
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297 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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298 while ( ( 0 == (chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) ) &&
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299 ((funs->putc)(chan, *buf) == false) )
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300 ; // Ignore full, keep trying
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301 #else
2
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302 while ((funs->putc)(chan, *buf) == false) ; // Ignore full, keep trying
115
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303 #endif
2
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304 buf++;
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305 }
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306 } else {
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307 cyg_drv_dsr_lock(); // Avoid race condition testing pointers
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308 while (size > 0) {
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309 next = cbuf->put + 1;
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310 if (next == cbuf->len) next = 0;
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311 if (cbuf->nb == cbuf->len) {
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312 cbuf->waiting = true;
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313 // Buffer full - wait for space
115
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314 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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315 if ( 0 == (chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) )
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316 #endif
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317 (funs->start_xmit)(chan); // Make sure xmit is running
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318
86
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319 // Check flag: 'start_xmit' may have obviated the need to wait :-)
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320 if (cbuf->waiting) {
86
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321 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
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322 // Optionally return if configured for non-blocking mode.
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323 if (!cbuf->blocking) {
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324 *len -= size; // number of characters actually sent
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325 cbuf->waiting = false;
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326 res = -EAGAIN;
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327 break;
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328 }
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329 #endif // CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
62
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330 cbuf->pending += size; // Have this much more to send [eventually]
115
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331 if( !cyg_drv_cond_wait(&cbuf->wait) )
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332 cbuf->abort = true;
62
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333 cbuf->pending -= size;
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334 }
2
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335 if (cbuf->abort) {
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336 // Give up!
86
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337 *len -= size; // number of characters actually sent
2
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338 cbuf->abort = false;
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339 cbuf->waiting = false;
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340 res = -EINTR;
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341 break;
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342 }
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343 } else {
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344 cbuf->data[cbuf->put++] = *buf++;
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345 cbuf->put = next;
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346 cbuf->nb++;
2
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347 size--; // Only count if actually sent!
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348 }
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349 }
115
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350 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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351 if ( 0 == (chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) )
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352 #endif
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353 (funs->start_xmit)(chan); // Start output as necessary
2
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354 cyg_drv_dsr_unlock();
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355 }
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356 cyg_drv_mutex_unlock(&cbuf->lock);
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357 return res;
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358 }
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359
115
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360
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361 // ---------------------------------------------------------------------------
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362
2
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363 static Cyg_ErrNo
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364 serial_read(cyg_io_handle_t handle, void *_buf, cyg_uint32 *len)
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365 {
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366 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
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367 serial_channel *chan = (serial_channel *)t->priv;
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368 serial_funs *funs = chan->funs;
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369 cyg_uint8 *buf = (cyg_uint8 *)_buf;
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370 cyg_int32 size = 0;
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371 cbuf_t *cbuf = &chan->in_cbuf;
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372 Cyg_ErrNo res = ENOERR;
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373 #ifdef XX_CYGDBG_DIAG_BUF
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374 extern int enable_diag_uart;
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375 int _enable = enable_diag_uart;
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376 int _time, _stime;
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377 externC cyg_tick_count_t cyg_current_time(void);
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378 #endif // CYGDBG_DIAG_BUF
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379
115
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380 cyg_drv_mutex_lock(&cbuf->lock);
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381 cbuf->abort = false;
86
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382
2
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383 if (cbuf->len == 0) {
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384 // Non interrupt driven (i.e. polled) operation
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385 while (size++ < *len) {
115
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386 cyg_uint8 c = (funs->getc)(chan);
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387 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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388 // for software flow control, if the driver returns one of the
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389 // characters we act on it and then drop it (the app must not
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390 // see it)
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391 if ( chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_TX ) {
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392 if ( c == CYGDAT_IO_SERIAL_FLOW_CONTROL_XOFF_CHAR ) {
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393 throttle_tx( chan );
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394 } else if ( c == CYGDAT_IO_SERIAL_FLOW_CONTROL_XON_CHAR ) {
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395 restart_tx( chan );
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396 }
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397 else
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398 *buf++ = c;
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399 }
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400 else
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401 *buf++ = c;
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402 #else
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403 *buf++ = c;
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404 #endif
2
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405 }
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406 } else {
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407 cyg_drv_dsr_lock(); // Avoid races
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408 while (size < *len) {
115
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409 if (cbuf->nb > 0) {
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410 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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411 if ( (cbuf->nb <= cbuf->low_water) &&
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412 (chan->flow_desc.flags & CYG_SERIAL_FLOW_IN_THROTTLED) )
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413 restart_rx( chan, false );
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diff changeset
414 #endif
2
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415 *buf++ = cbuf->data[cbuf->get];
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416 if (++cbuf->get == cbuf->len) cbuf->get = 0;
115
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417 cbuf->nb--;
2
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418 size++;
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419 } else {
86
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420 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
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diff changeset
421 if (!cbuf->blocking) {
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422 *len = size; // characters actually read
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423 res = -EAGAIN;
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diff changeset
424 break;
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diff changeset
425 }
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426 #endif // CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
2
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427 cbuf->waiting = true;
20
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428 #ifdef XX_CYGDBG_DIAG_BUF
115
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429 enable_diag_uart = 0;
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430 HAL_CLOCK_READ(&_time);
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431 _stime = (int)cyg_current_time();
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diff changeset
432 diag_printf("READ wait - get: %d, put: %d, time: %x.%x\n", cbuf->get, cbuf->put, _stime, _time);
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parents: 107
diff changeset
433 enable_diag_uart = _enable;
20
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jlarmour
parents: 4
diff changeset
434 #endif // CYGDBG_DIAG_BUF
115
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parents: 107
diff changeset
435 if( !cyg_drv_cond_wait(&cbuf->wait) )
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parents: 107
diff changeset
436 cbuf->abort = true;
20
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jlarmour
parents: 4
diff changeset
437 #ifdef XX_CYGDBG_DIAG_BUF
115
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parents: 107
diff changeset
438 enable_diag_uart = 0;
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parents: 107
diff changeset
439 HAL_CLOCK_READ(&_time);
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parents: 107
diff changeset
440 _stime = (int)cyg_current_time();
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parents: 107
diff changeset
441 diag_printf("READ continue - get: %d, put: %d, time: %x.%x\n", cbuf->get, cbuf->put, _stime, _time);
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parents: 107
diff changeset
442 enable_diag_uart = _enable;
20
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jlarmour
parents: 4
diff changeset
443 #endif // CYGDBG_DIAG_BUF
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
444 if (cbuf->abort) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
445 // Give up!
86
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parents: 82
diff changeset
446 *len = size; // characters actually read
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
447 cbuf->abort = false;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
448 cbuf->waiting = false;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
449 res = -EINTR;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
450 break;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
451 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
452 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
453 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
454 cyg_drv_dsr_unlock();
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
455 }
82
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parents: 66
diff changeset
456 #ifdef XX_CYGDBG_DIAG_BUF
20
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jlarmour
parents: 4
diff changeset
457 cyg_drv_isr_lock();
82
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parents: 66
diff changeset
458 enable_diag_uart = 0;
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jlarmour
parents: 66
diff changeset
459 HAL_CLOCK_READ(&_time);
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jlarmour
parents: 66
diff changeset
460 _stime = (int)cyg_current_time();
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parents: 66
diff changeset
461 diag_printf("READ done - size: %d, len: %d, time: %x.%x\n", size, *len, _stime, _time);
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parents: 66
diff changeset
462 enable_diag_uart = _enable;
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parents: 66
diff changeset
463 cyg_drv_isr_unlock();
20
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jlarmour
parents: 4
diff changeset
464 #endif // CYGDBG_DIAG_BUF
2
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jlarmour
parents:
diff changeset
465 cyg_drv_mutex_unlock(&cbuf->lock);
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
466 return res;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
467 }
443894e2e912 Block commit of eCos version 1.2.1
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parents:
diff changeset
468
115
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parents: 107
diff changeset
469
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parents: 107
diff changeset
470 // ---------------------------------------------------------------------------
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diff changeset
471
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diff changeset
472 static cyg_bool
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diff changeset
473 serial_select(cyg_io_handle_t handle, cyg_uint32 which, CYG_ADDRWORD info)
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jlarmour
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diff changeset
474 {
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parents: 107
diff changeset
475 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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diff changeset
476
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diff changeset
477 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
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diff changeset
478 serial_channel *chan = (serial_channel *)t->priv;
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jlarmour
parents: 107
diff changeset
479
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jlarmour
parents: 107
diff changeset
480
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
481 switch( which )
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jlarmour
parents: 107
diff changeset
482 {
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jlarmour
parents: 107
diff changeset
483 case CYG_FREAD:
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diff changeset
484 {
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diff changeset
485 cbuf_t *cbuf = &chan->in_cbuf;
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diff changeset
486
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diff changeset
487 // Check for data in the input buffer. If there is none,
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diff changeset
488 // register the select operation, otherwise return true.
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diff changeset
489
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diff changeset
490 if( cbuf->nb == 0 )
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diff changeset
491 cyg_selrecord( info, &cbuf->selinfo );
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diff changeset
492 else return true;
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parents: 107
diff changeset
493 }
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jlarmour
parents: 107
diff changeset
494 break;
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parents: 107
diff changeset
495
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jlarmour
parents: 107
diff changeset
496 case CYG_FWRITE:
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jlarmour
parents: 107
diff changeset
497 {
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diff changeset
498 // Check for space in the output 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 cbuf_t *cbuf = &chan->out_cbuf;
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diff changeset
502 int space = cbuf->len - cbuf->nb;
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diff changeset
503 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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diff changeset
504 if ( (space < cbuf->low_water) ||
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diff changeset
505 (chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED) )
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diff changeset
506 cyg_selrecord( info, &cbuf->selinfo );
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diff changeset
507 #else
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parents: 107
diff changeset
508 if (space < cbuf->low_water)
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diff changeset
509 cyg_selrecord( info, &cbuf->selinfo );
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diff changeset
510 #endif
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diff changeset
511 else return true;
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parents: 107
diff changeset
512 }
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diff changeset
513 break;
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parents: 107
diff changeset
514
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parents: 107
diff changeset
515 case 0: // exceptions - none supported
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parents: 107
diff changeset
516 break;
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parents: 107
diff changeset
517 }
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diff changeset
518 return false;
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jlarmour
parents: 107
diff changeset
519 #else
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diff changeset
520
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jlarmour
parents: 107
diff changeset
521 // With no select support, we simply return true.
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diff changeset
522 return true;
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parents: 107
diff changeset
523 #endif
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jlarmour
parents: 107
diff changeset
524 }
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jlarmour
parents: 107
diff changeset
525
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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diff changeset
526
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
527 // ---------------------------------------------------------------------------
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diff changeset
528
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
529 static Cyg_ErrNo
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
530 serial_get_config(cyg_io_handle_t handle, cyg_uint32 key, void *xbuf, cyg_uint32 *len)
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
531 {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
532 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
533 serial_channel *chan = (serial_channel *)t->priv;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
534 cyg_serial_info_t *buf = (cyg_serial_info_t *)xbuf;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
535 Cyg_ErrNo res = ENOERR;
86
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jlarmour
parents: 82
diff changeset
536 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
537 cbuf_t *in_cbuf = &chan->in_cbuf;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
538 serial_funs *funs = chan->funs;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
539
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
540 switch (key) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
541 case CYG_IO_GET_CONFIG_SERIAL_INFO:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
542 if (*len < sizeof(cyg_serial_info_t)) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
543 return -EINVAL;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
544 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
545 *buf = chan->config;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
546 *len = sizeof(chan->config);
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
547 break;
86
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jlarmour
parents: 82
diff changeset
548
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jlarmour
parents: 82
diff changeset
549 case CYG_IO_GET_CONFIG_SERIAL_BUFFER_INFO:
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jlarmour
parents: 82
diff changeset
550 // return rx/tx buffer sizes and counts
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jlarmour
parents: 82
diff changeset
551 {
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jlarmour
parents: 82
diff changeset
552 cyg_serial_buf_info_t *p;
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jlarmour
parents: 82
diff changeset
553 if (*len < sizeof(cyg_serial_buf_info_t))
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jlarmour
parents: 82
diff changeset
554 return -EINVAL;
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jlarmour
parents: 82
diff changeset
555
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jlarmour
parents: 82
diff changeset
556 *len = sizeof(cyg_serial_buf_info_t);
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jlarmour
parents: 82
diff changeset
557 p = (cyg_serial_buf_info_t *)xbuf;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
558
88
afdeb44241de Merge from eCos master repository on 2000-05-12-07:47:04-BST
jlarmour
parents: 86
diff changeset
559 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
560 if (p->rx_bufsize)
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jlarmour
parents: 107
diff changeset
561 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
562 else
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jlarmour
parents: 82
diff changeset
563 p->rx_count = 0;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
564
88
afdeb44241de Merge from eCos master repository on 2000-05-12-07:47:04-BST
jlarmour
parents: 86
diff changeset
565 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
566 if (p->tx_bufsize)
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jlarmour
parents: 107
diff changeset
567 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
568 else
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
569 p->tx_count = 0;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
570 }
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jlarmour
parents: 82
diff changeset
571 break;
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jlarmour
parents: 82
diff changeset
572
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
573 case CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
574 // Wait for any pending output to complete
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
575 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
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parents: 82
diff changeset
576 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
577 cyg_drv_dsr_lock();
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
578 while (out_cbuf->pending || (out_cbuf->nb > 0)) {
86
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jlarmour
parents: 82
diff changeset
579 out_cbuf->waiting = true;
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
580 if(!cyg_drv_cond_wait(&out_cbuf->wait) )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
581 res = -EINTR;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
582 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
583 cyg_drv_dsr_unlock();
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
584 cyg_drv_mutex_unlock(&out_cbuf->lock);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
585 break;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
586
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
587 case CYG_IO_GET_CONFIG_SERIAL_INPUT_FLUSH:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
588 // Flush any buffered input
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
589 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
590 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
591 cyg_drv_dsr_lock();
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
592 if (in_cbuf->waiting) {
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jlarmour
parents: 82
diff changeset
593 in_cbuf->abort = true;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
594 cyg_drv_cond_signal(&in_cbuf->wait);
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
595 in_cbuf->waiting = false;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
596 }
115
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parents: 107
diff changeset
597 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
598 cyg_drv_dsr_unlock();
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
599 cyg_drv_mutex_unlock(&in_cbuf->lock);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
600 break;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
601
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
602 case CYG_IO_GET_CONFIG_SERIAL_ABORT:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
603 // Abort any outstanding I/O, including blocked reads
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
604 // 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
605 if (in_cbuf->len != 0) {
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jlarmour
parents: 82
diff changeset
606 in_cbuf->abort = true;
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jlarmour
parents: 82
diff changeset
607 cyg_drv_cond_signal(&in_cbuf->wait);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
608 }
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
609 if (out_cbuf->len != 0) {
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jlarmour
parents: 82
diff changeset
610 out_cbuf->abort = true;
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jlarmour
parents: 82
diff changeset
611 cyg_drv_cond_signal(&out_cbuf->wait);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
612 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
613 break;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
614
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
615 case CYG_IO_GET_CONFIG_SERIAL_OUTPUT_FLUSH:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
616 // 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
617 if (out_cbuf->len == 0) break; // Nothing to do if not buffered
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jlarmour
parents: 82
diff changeset
618 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
619 cyg_drv_dsr_lock();
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
620 if (out_cbuf->nb > 0) {
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diff changeset
621 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
622 (funs->stop_xmit)(chan); // Done with transmit
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
623 }
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
624 if (out_cbuf->waiting) {
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jlarmour
parents: 82
diff changeset
625 out_cbuf->abort = true;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
626 cyg_drv_cond_signal(&out_cbuf->wait);
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
627 out_cbuf->waiting = false;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
628 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
629 cyg_drv_dsr_unlock();
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
630 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
631 break;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
632
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
633 #ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
634 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
635 if (*len < sizeof(cyg_uint32)) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
636 return -EINVAL;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
637 }
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
638 *(cyg_uint32*)xbuf = (in_cbuf->blocking) ? 1 : 0;
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
639 break;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
640
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
641 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
642 if (*len < sizeof(cyg_uint32)) {
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
643 return -EINVAL;
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 *(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
646 break;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
647 #endif // CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
648
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
649 default:
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
650 res = -EINVAL;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
651 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
652 return res;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
653 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
654
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
655
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
656 // ---------------------------------------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
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diff changeset
657
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
658 static Cyg_ErrNo
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
659 serial_set_config(cyg_io_handle_t handle, cyg_uint32 key, const void *xbuf, cyg_uint32 *len)
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
660 {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
661 Cyg_ErrNo res = ENOERR;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
662 cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)handle;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
663 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
664 #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
665 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
666 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
667 #endif
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
668 serial_funs *funs = chan->funs;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
669
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
670 switch (key) {
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
671 #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
672 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
673 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
674 return -EINVAL;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
675 }
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
676 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
677 break;
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
678 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
679 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
680 return -EINVAL;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
681 }
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
682 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
683 break;
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
jlarmour
parents: 82
diff changeset
684 #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
685
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jlarmour
parents: 107
diff changeset
686 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
687 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
688 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
689 cyg_uint32 *f = (cyg_uint32 *)xbuf;
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jlarmour
parents: 107
diff changeset
690
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
691 if (*len < sizeof(*f))
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jlarmour
parents: 107
diff changeset
692 return -EINVAL;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
693
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
694 cyg_drv_dsr_lock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
695
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
696 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
697 CYGNUM_SERIAL_FLOW_XONXOFF_TX|
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jlarmour
parents: 107
diff changeset
698 CYGNUM_SERIAL_FLOW_RTSCTS_RX|
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
699 CYGNUM_SERIAL_FLOW_RTSCTS_TX|
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
700 CYGNUM_SERIAL_FLOW_DSRDTR_RX|
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jlarmour
parents: 107
diff changeset
701 CYGNUM_SERIAL_FLOW_DSRDTR_TX);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
702 chan->config.flags |= (*f & (
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
703 #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
704 CYGNUM_SERIAL_FLOW_XONXOFF_RX|
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jlarmour
parents: 107
diff changeset
705 CYGNUM_SERIAL_FLOW_XONXOFF_TX|
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jlarmour
parents: 107
diff changeset
706 #endif
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jlarmour
parents: 107
diff changeset
707 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
708 CYGNUM_SERIAL_FLOW_RTSCTS_RX|
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jlarmour
parents: 107
diff changeset
709 CYGNUM_SERIAL_FLOW_RTSCTS_TX|
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jlarmour
parents: 107
diff changeset
710 CYGNUM_SERIAL_FLOW_DSRDTR_RX|
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jlarmour
parents: 107
diff changeset
711 CYGNUM_SERIAL_FLOW_DSRDTR_TX|
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jlarmour
parents: 107
diff changeset
712 #endif
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jlarmour
parents: 107
diff changeset
713 0));
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jlarmour
parents: 107
diff changeset
714 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_HW
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
715 // up to hardware driver to clear flags if rejected
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jlarmour
parents: 107
diff changeset
716 res = (funs->set_config)(chan,
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
717 CYG_IO_SET_CONFIG_SERIAL_HW_FLOW_CONFIG,
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
718 NULL, NULL);
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jlarmour
parents: 107
diff changeset
719 #endif
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jlarmour
parents: 107
diff changeset
720 cyg_drv_dsr_unlock();
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jlarmour
parents: 107
diff changeset
721 }
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jlarmour
parents: 107
diff changeset
722 break;
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jlarmour
parents: 107
diff changeset
723
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jlarmour
parents: 107
diff changeset
724 case CYG_IO_SET_CONFIG_SERIAL_FLOW_CONTROL_FORCE:
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parents: 107
diff changeset
725 {
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jlarmour
parents: 107
diff changeset
726 cyg_uint32 *f = (cyg_uint32 *)xbuf;
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jlarmour
parents: 107
diff changeset
727
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jlarmour
parents: 107
diff changeset
728 if (*len < sizeof(*f))
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jlarmour
parents: 107
diff changeset
729 return -EINVAL;
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jlarmour
parents: 107
diff changeset
730
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jlarmour
parents: 107
diff changeset
731 cyg_drv_dsr_lock();
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parents: 107
diff changeset
732 switch (*f) {
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jlarmour
parents: 107
diff changeset
733 case CYGNUM_SERIAL_FLOW_THROTTLE_RX:
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jlarmour
parents: 107
diff changeset
734 throttle_rx( chan, true );
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parents: 107
diff changeset
735 break;
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jlarmour
parents: 107
diff changeset
736 case CYGNUM_SERIAL_FLOW_RESTART_RX:
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parents: 107
diff changeset
737 restart_rx( chan, true );
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parents: 107
diff changeset
738 break;
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parents: 107
diff changeset
739 case CYGNUM_SERIAL_FLOW_THROTTLE_TX:
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parents: 107
diff changeset
740 throttle_tx( chan );
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parents: 107
diff changeset
741 break;
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parents: 107
diff changeset
742 case CYGNUM_SERIAL_FLOW_RESTART_TX:
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parents: 107
diff changeset
743 restart_tx( chan );
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parents: 107
diff changeset
744 break;
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parents: 107
diff changeset
745 default:
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parents: 107
diff changeset
746 res = -EINVAL;
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jlarmour
parents: 107
diff changeset
747 break;
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jlarmour
parents: 107
diff changeset
748 }
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jlarmour
parents: 107
diff changeset
749 cyg_drv_dsr_unlock();
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parents: 107
diff changeset
750 }
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jlarmour
parents: 107
diff changeset
751 break;
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parents: 107
diff changeset
752 #endif // CYGPKG_IO_SERIAL_FLOW_CONTROL
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diff changeset
753
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jlarmour
parents: 107
diff changeset
754 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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parents: 107
diff changeset
755 case CYG_IO_SET_CONFIG_SERIAL_STATUS_CALLBACK:
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parents: 107
diff changeset
756 {
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parents: 107
diff changeset
757 cyg_serial_line_status_callback_fn_t newfn;
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parents: 107
diff changeset
758 CYG_ADDRWORD newpriv;
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parents: 107
diff changeset
759 cyg_serial_line_status_callback_t *tmp =
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parents: 107
diff changeset
760 (cyg_serial_line_status_callback_t *)xbuf;
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parents: 107
diff changeset
761
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jlarmour
parents: 107
diff changeset
762 if ( *len < sizeof(*tmp) )
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jlarmour
parents: 107
diff changeset
763 return -EINVAL;
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parents: 107
diff changeset
764
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parents: 107
diff changeset
765 newfn = tmp->fn;
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jlarmour
parents: 107
diff changeset
766 newpriv = tmp->priv;
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parents: 107
diff changeset
767
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parents: 107
diff changeset
768 // prevent callbacks while we do this
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parents: 107
diff changeset
769 cyg_drv_dsr_lock();
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parents: 107
diff changeset
770 // store old callbacks in same structure
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parents: 107
diff changeset
771 tmp->fn = chan->status_callback;
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jlarmour
parents: 107
diff changeset
772 tmp->priv = chan->status_callback_priv;
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parents: 107
diff changeset
773 chan->status_callback = newfn;
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parents: 107
diff changeset
774 chan->status_callback_priv = newpriv;
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parents: 107
diff changeset
775 cyg_drv_dsr_unlock();
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parents: 107
diff changeset
776 *len = sizeof(*tmp);
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jlarmour
parents: 107
diff changeset
777 }
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jlarmour
parents: 107
diff changeset
778 break;
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parents: 107
diff changeset
779 #endif
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diff changeset
780
2
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jlarmour
parents:
diff changeset
781 default:
115
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parents: 107
diff changeset
782 // pass down to lower layers
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parents: 107
diff changeset
783 return (funs->set_config)(chan, key, xbuf, len);
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
784 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
785 return res;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
786 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
787
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
788 // ---------------------------------------------------------------------------
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parents: 107
diff changeset
789
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
790 static void
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jlarmour
parents:
diff changeset
791 serial_xmt_char(serial_channel *chan)
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jlarmour
parents:
diff changeset
792 {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
793 cbuf_t *cbuf = &chan->out_cbuf;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
794 serial_funs *funs = chan->funs;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
795 unsigned char c;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
796 int space;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
797
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
798 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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jlarmour
parents: 107
diff changeset
799 // if we are required to send an XON/XOFF char, send it before anything else
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jlarmour
parents: 107
diff changeset
800 // FIXME: what if XON gets corrupted in transit to the other end?
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jlarmour
parents: 107
diff changeset
801 // Should we resend XON even though the other end may not be wanting
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jlarmour
parents: 107
diff changeset
802 // to send us stuff at this point?
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jlarmour
parents: 107
diff changeset
803 if ( chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_RX ) {
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jlarmour
parents: 107
diff changeset
804 if ( chan->flow_desc.xchar ) {
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jlarmour
parents: 107
diff changeset
805 if ( (funs->putc)(chan, chan->flow_desc.xchar) ) {
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jlarmour
parents: 107
diff changeset
806 chan->flow_desc.xchar = '\0';
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jlarmour
parents: 107
diff changeset
807 } else { // otherwise there's no space and we have to wait
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jlarmour
parents: 107
diff changeset
808 return;
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jlarmour
parents: 107
diff changeset
809 }
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jlarmour
parents: 107
diff changeset
810 }
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jlarmour
parents: 107
diff changeset
811 }
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jlarmour
parents: 107
diff changeset
812 #endif
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jlarmour
parents: 107
diff changeset
813 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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jlarmour
parents: 107
diff changeset
814 // if we're meant to be throttled, just stop and leave
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jlarmour
parents: 107
diff changeset
815 if ( chan->flow_desc.flags & CYG_SERIAL_FLOW_OUT_THROTTLED ) {
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jlarmour
parents: 107
diff changeset
816 (funs->stop_xmit)(chan); // Stop transmitting for now
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jlarmour
parents: 107
diff changeset
817 return;
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jlarmour
parents: 107
diff changeset
818 }
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jlarmour
parents: 107
diff changeset
819 #endif
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jlarmour
parents: 107
diff changeset
820 while (cbuf->nb > 0) {
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
821 c = cbuf->data[cbuf->get];
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
822 if ((funs->putc)(chan, c)) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
823 cbuf->get++;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
824 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
825 cbuf->nb--;
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jlarmour
parents: 107
diff changeset
826 } else {
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jlarmour
parents: 107
diff changeset
827 // See if there is now enough room to restart writer
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jlarmour
parents: 107
diff changeset
828 space = cbuf->len - cbuf->nb;
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jlarmour
parents: 107
diff changeset
829 if (space >= cbuf->low_water) {
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jlarmour
parents: 107
diff changeset
830 if (cbuf->waiting) {
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
831 cbuf->waiting = false;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
832 cyg_drv_cond_broadcast(&cbuf->wait);
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
833 }
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
834 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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parents: 107
diff changeset
835 cyg_selwakeup( &cbuf->selinfo );
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parents: 107
diff changeset
836 #endif
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
837 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
838 return; // Need to wait for more space
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
839 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
840 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
841 (funs->stop_xmit)(chan); // Done with transmit
115
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parents: 107
diff changeset
842
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jlarmour
parents: 107
diff changeset
843 // must signal waiters, and wake up selecters for the case when
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
844 // this was the last char to be sent and they hadn't been signalled
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
845 // before (e.g. because of flow control)
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
846 if (cbuf->waiting) {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
847 cbuf->waiting = false;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
848 cyg_drv_cond_signal(&cbuf->wait);
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
849 }
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
850 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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jlarmour
parents: 107
diff changeset
851 cyg_selwakeup( &cbuf->selinfo );
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jlarmour
parents: 107
diff changeset
852 #endif
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
853 }
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
854
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
855 // ---------------------------------------------------------------------------
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parents: 107
diff changeset
856
2
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
857 static void
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
858 serial_rcv_char(serial_channel *chan, unsigned char c)
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
859 {
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
860 cbuf_t *cbuf = &chan->in_cbuf;
443894e2e912 Block commit of eCos version 1.2.1
jlarmour
parents:
diff changeset
861
115
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parents: 107
diff changeset
862 #ifdef CYGOPT_IO_SERIAL_FLOW_CONTROL_SOFTWARE
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jlarmour
parents: 107
diff changeset
863 // for software flow control, if the driver returns one of the characters
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents: 107
diff changeset
864 // we act on it and then drop it (the app must not see it)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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parents: 107
diff changeset
865 if ( chan->config.flags & CYGNUM_SERIAL_FLOW_XONXOFF_TX ) {
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parents: 107
diff changeset
866 if ( c == CYGDAT_IO_SERIAL_FLOW_CONTROL_XOFF_CHAR ) {
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diff changeset
867 throttle_tx( chan );
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diff changeset
868 return; // it wasn't a "real" character
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parents: 107
diff changeset
869 } else if ( c == CYGDAT_IO_SERIAL_FLOW_CONTROL_XON_CHAR ) {
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diff changeset
870 restart_tx( chan );
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diff changeset
871 return; // it wasn't a "real" character
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diff changeset
872 }
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diff changeset
873 }
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diff changeset
874 #endif
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diff changeset
875 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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diff changeset
876 // If we've hit the high water mark, tell the other side to stop
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diff changeset
877 if ( cbuf->nb >= cbuf->high_water ) {
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parents: 107
diff changeset
878 throttle_rx( chan, false );
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diff changeset
879 }
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diff changeset
880 #endif
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diff changeset
881 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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diff changeset
882 // Wake up any pending selectors if we are about to
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diff changeset
883 // put some data into a previously empty buffer.
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diff changeset
884 if( cbuf->nb == 0 )
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diff changeset
885 cyg_selwakeup( &cbuf->selinfo );
86
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diff changeset
886 #endif
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diff changeset
887
115
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diff changeset
888 // If the flow control is not enabled/sufficient and the buffer is
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diff changeset
889 // already full, just throw new characters away.
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diff changeset
890
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parents: 107
diff changeset
891 if( cbuf->nb < cbuf->len )
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parents: 107
diff changeset
892 {
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diff changeset
893 cbuf->data[cbuf->put++] = c;
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diff changeset
894 if (cbuf->put == cbuf->len) cbuf->put = 0;
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diff changeset
895 cbuf->nb++;
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diff changeset
896 }
2
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diff changeset
897 if (cbuf->waiting) {
20
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diff changeset
898 #ifdef XX_CYGDBG_DIAG_BUF
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diff changeset
899 extern int enable_diag_uart;
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diff changeset
900 int _enable = enable_diag_uart;
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parents: 4
diff changeset
901 int _time, _stime;
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diff changeset
902 externC cyg_tick_count_t cyg_current_time(void);
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diff changeset
903 enable_diag_uart = 0;
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diff changeset
904 HAL_CLOCK_READ(&_time);
5f5102441818 Merge from eCos master repository on 1999-07-02-23:17:07-BST
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diff changeset
905 _stime = (int)cyg_current_time();
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diff changeset
906 diag_printf("Signal reader - time: %x.%x\n", _stime, _time);
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parents: 4
diff changeset
907 enable_diag_uart = _enable;
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diff changeset
908 #endif // CYGDBG_DIAG_BUF
2
443894e2e912 Block commit of eCos version 1.2.1
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parents:
diff changeset
909 cbuf->waiting = false;
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jlarmour
parents:
diff changeset
910 cyg_drv_cond_signal(&cbuf->wait);
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jlarmour
parents:
diff changeset
911 }
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parents:
diff changeset
912 }
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diff changeset
913
86
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diff changeset
914 //----------------------------------------------------------------------------
115
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diff changeset
915 // Flow control indication callback
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diff changeset
916
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diff changeset
917 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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diff changeset
918 static void
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diff changeset
919 serial_indicate_status(serial_channel *chan, cyg_serial_line_status_t *s )
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diff changeset
920 {
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diff changeset
921 #ifdef CYGPKG_IO_SERIAL_FLOW_CONTROL
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diff changeset
922 if ( CYGNUM_SERIAL_STATUS_FLOW == s->which ) {
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parents: 107
diff changeset
923 if ( s->value )
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diff changeset
924 restart_tx( chan );
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diff changeset
925 else
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diff changeset
926 throttle_tx( chan );
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diff changeset
927 }
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diff changeset
928 #endif
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diff changeset
929 if ( chan->status_callback )
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diff changeset
930 (*chan->status_callback)(s, chan->status_callback_priv);
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diff changeset
931 }
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diff changeset
932 #endif // ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
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diff changeset
933
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diff changeset
934 //----------------------------------------------------------------------------
86
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diff changeset
935 // Block transfer functions. Not all drivers require these.
115
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diff changeset
936 #if CYGINT_IO_SERIAL_BLOCK_TRANSFER
86
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diff changeset
937
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parents: 82
diff changeset
938 static bool
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parents: 82
diff changeset
939 serial_data_rcv_req(serial_channel *chan, int avail,
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parents: 82
diff changeset
940 int* space_avail, unsigned char** space)
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
941 {
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diff changeset
942 cbuf_t *cbuf = &chan->in_cbuf;
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parents: 82
diff changeset
943 int gap;
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diff changeset
944
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diff changeset
945 // Check for space
115
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diff changeset
946 gap = cbuf->nb;
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diff changeset
947 if (gap == cbuf->len)
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diff changeset
948 return false; // full
86
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diff changeset
949
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diff changeset
950 if (0 == gap) {
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parents: 82
diff changeset
951 // Buffer is empty. Reset put/get indexes to get max transfer in
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
952 // one chunk.
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parents: 82
diff changeset
953 cbuf->get = 0;
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parents: 82
diff changeset
954 cbuf->put = 0;
115
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diff changeset
955 gap = cbuf->len;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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diff changeset
956 } else {
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parents: 82
diff changeset
957 // Free space (G = get, P = put, x = data, . = empty)
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
958 // positive: xxxxP.....Gxxx
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diff changeset
959 // negative: ..GxxxxxP..... [offer last chunk only]
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parents: 82
diff changeset
960
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diff changeset
961 // First try for a gap between put and get locations
115
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diff changeset
962 gap = cbuf->get - cbuf->put;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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diff changeset
963 if (gap < 0) {
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parents: 82
diff changeset
964 // If failed, the gap is between put and the end of buffer
107
7f461c3a372c Merge from eCos master repository on 2000-07-04-08:04:30-BST
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diff changeset
965 gap = cbuf->len - cbuf->put;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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parents: 82
diff changeset
966 }
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parents: 82
diff changeset
967 }
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diff changeset
968
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parents: 82
diff changeset
969 if (avail < gap) gap = avail; // bound by what's available from hw
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parents: 82
diff changeset
970
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parents: 82
diff changeset
971 *space_avail = gap;
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parents: 82
diff changeset
972 *space = &cbuf->data[cbuf->put];
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parents: 82
diff changeset
973 cbuf->put += gap;
115
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diff changeset
974 cbuf->nb += gap;
86
6512add4f5d6 Merge from eCos master repository on 2000-05-05-07:47:05-BST
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diff changeset
975
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diff changeset
976 if (cbuf->put == cbuf->len) cbuf->put = 0;
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parents: 82
diff changeset
977
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parents: 82
diff changeset
978 return true;
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parents: 82
diff changeset
979 }
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parents: 82
diff changeset
980
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parents: 82
diff changeset
981 static void
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diff changeset
982 serial_data_rcv_done(serial_channel *chan)
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diff changeset
983 {
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diff changeset
984 cbuf_t *cbuf = &chan->in_cbuf;
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parents: 82
diff changeset
985 if (cbuf->waiting) {
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jlarmour
parents: 82
diff changeset
986 cbuf->waiting = false;
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jlarmour
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diff changeset
987 cyg_drv_cond_signal(&cbuf->wait);
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parents: 82
diff changeset
988 }
115
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diff changeset
989 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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diff changeset
990 // Wake up any pending selectors if we have
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jlarmour
parents: 107
diff changeset
991 // put some data into a previously empty buffer.
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parents: 107
diff changeset
992 cyg_selwakeup( &cbuf->selinfo );
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diff changeset
993 #endif
86
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parents: 82
diff changeset
994 }
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parents: 82
diff changeset
995
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diff changeset
996 static bool
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jlarmour
parents: 82
diff changeset
997 serial_data_xmt_req(serial_channel *chan, int space,
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parents: 82
diff changeset
998 int* chars_avail, unsigned char** chars)
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parents: 82
diff changeset
999 {
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diff changeset
1000 cbuf_t *cbuf = &chan->out_cbuf;
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parents: 82
diff changeset
1001 int avail;
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jlarmour
parents: 82
diff changeset
1002
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parents: 82
diff changeset
1003 // Available data (G = get, P = put, x = data, . = empty)
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jlarmour
parents: 82
diff changeset
1004 // 0: no data
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1005 // negative: xxxxP.....Gxxx [offer last chunk only]
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1006 // positive: ..GxxxxxP.....
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1007 if (0 == cbuf->nb)
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1008 return false;
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1009 if (cbuf->get >= cbuf->put) {
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1010 avail = cbuf->len - cbuf->get;
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1011 } else {
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1012 avail = cbuf->put - cbuf->get;
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1013 }
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1014
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1015 if (avail > space) avail = space; // bound by space in hardware
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1016
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1017 *chars_avail = avail;
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1018 *chars = &cbuf->data[cbuf->get];
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1019 cbuf->get += avail;
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1020 cbuf->nb -= avail;
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1021
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1022 if (cbuf->get == cbuf->len) cbuf->get = 0;
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1023
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1024 return true;
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1025 }
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1026
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1027 static void
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1028 serial_data_xmt_done(serial_channel *chan)
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1029 {
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1030 cbuf_t *cbuf = &chan->out_cbuf;
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1031 serial_funs *funs = chan->funs;
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1032 int space;
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1033
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1034 (funs->stop_xmit)(chan); // Done with transmit
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1035
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1036 // See if there is now enough room to restart writer
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1037 space = cbuf->len - cbuf->nb;
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1038 if (space >= cbuf->low_water) {
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1039 if (cbuf->waiting) {
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1040 cbuf->waiting = false;
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1041 cyg_drv_cond_broadcast(&cbuf->wait);
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1042 }
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1043 #ifdef CYGPKG_IO_SERIAL_SELECT_SUPPORT
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1044 cyg_selwakeup( &cbuf->selinfo );
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1045 #endif
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1046 }
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1047 }
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1048
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1049 #endif // CYGINT_IO_SERIAL_BLOCK_TRANSFER
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1050
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1051 // ---------------------------------------------------------------------------
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1052
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1053 // EOF serial.c