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annotate packages/devs/serial/loop/current/src/loop_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
children e0c0827131d1
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115
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1 //==========================================================================
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2 //
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3 // loop_serial.c
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4 //
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5 // Loopback serial device 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): nickg
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35 // Contributors: nickg
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36 // Date: 1999-02-25
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37 // Purpose: Loopback serial device driver
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38 // Description: This device driver implements a pair of serial lines that are
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39 // connected back-to-back. Data output to one will appear as
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40 // input on the other. This process in in part driven by an alarm
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41 // object which provides a degree of separation between the two
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42 // channels.
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43 //
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44 //####DESCRIPTIONEND####
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45 //
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46 //==========================================================================
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47
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48 #include <pkgconf/hal.h>
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49 #include <pkgconf/io_serial.h>
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50 #include <pkgconf/io_serial_loop.h>
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51 #include <cyg/hal/hal_io.h>
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52
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53 #include <cyg/io/io.h>
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54 #include <cyg/io/devtab.h>
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55 #include <cyg/io/serial.h>
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56 #include <cyg/hal/hal_intr.h>
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57 #include <cyg/kernel/kapi.h>
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58
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59 #ifdef CYGPKG_IO_SERIAL_LOOP
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60
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61 //-------------------------------------------------------------------------
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62
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63 extern void diag_printf(const char *fmt, ...);
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64
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65 //-------------------------------------------------------------------------
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66 // Forward definitions
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67
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68 static bool loop_serial_init(struct cyg_devtab_entry *tab);
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69 static bool loop_serial_putc(serial_channel *chan, unsigned char c);
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70 static Cyg_ErrNo loop_serial_lookup(struct cyg_devtab_entry **tab,
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71 struct cyg_devtab_entry *sub_tab,
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72 const char *name);
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73 static unsigned char loop_serial_getc(serial_channel *chan);
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74 static Cyg_ErrNo loop_serial_set_config(serial_channel *chan, cyg_uint32 key,
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75 const void *xbuf, cyg_uint32 *len);
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76 static void loop_serial_start_xmit(serial_channel *chan);
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77 static void loop_serial_stop_xmit(serial_channel *chan);
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78
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79 #ifndef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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80 static void alarm_handler(cyg_handle_t alarm, cyg_addrword_t data);
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81 #endif
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82
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83 //-------------------------------------------------------------------------
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84 // Alarm object for feeding data back into serial channels
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85
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86 static cyg_alarm alarm_obj;
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87
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88 static cyg_handle_t alarm_handle;
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89
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90 //-------------------------------------------------------------------------
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91 // Transfer FIFOs
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92
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93 #define FIFO_SIZE 16
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94
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95 struct fifo
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96 {
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97 cyg_bool tx_enable;
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98 volatile int head;
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99 volatile int tail;
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100 volatile int num;
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101 volatile char buf[FIFO_SIZE+1];
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102 };
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103
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104 static struct fifo fifo0 = { false, 0, 0, 0 }; // from serial0 to serial1
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105 static struct fifo fifo1 = { false, 0, 0, 0 }; // from serial1 to serial0
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106
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107 //-------------------------------------------------------------------------
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108
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109 #define BUFSIZE 128
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110
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111 //-------------------------------------------------------------------------
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112 // Info for each serial device controlled
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113
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114 typedef struct loop_serial_info {
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115 struct fifo *write_fifo;
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116 struct fifo *read_fifo;
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117 } loop_serial_info;
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118
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119 //-------------------------------------------------------------------------
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120 // Callback functions exported by this driver
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121
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122 static SERIAL_FUNS(loop_serial_funs,
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123 loop_serial_putc,
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124 loop_serial_getc,
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125 loop_serial_set_config,
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126 loop_serial_start_xmit,
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127 loop_serial_stop_xmit
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128 );
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129
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130 //-------------------------------------------------------------------------
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131 // Hardware info for each serial line
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132
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133 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL0
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134 static loop_serial_info loop_serial_info0 = {
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135 &fifo0,
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136 &fifo1
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137 };
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138 #if CYGNUM_IO_SERIAL_LOOP_SERIAL0_BUFSIZE > 0
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139 static unsigned char loop_serial_out_buf0[CYGNUM_IO_SERIAL_LOOP_SERIAL0_BUFSIZE];
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140 static unsigned char loop_serial_in_buf0[CYGNUM_IO_SERIAL_LOOP_SERIAL0_BUFSIZE];
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141 #endif
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142 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL0
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143
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144 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL1
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145 static loop_serial_info loop_serial_info1 = {
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146 &fifo1,
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147 &fifo0
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148 };
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149 #if CYGNUM_IO_SERIAL_LOOP_SERIAL1_BUFSIZE > 0
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150 static unsigned char loop_serial_out_buf1[CYGNUM_IO_SERIAL_LOOP_SERIAL1_BUFSIZE];
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151 static unsigned char loop_serial_in_buf1[CYGNUM_IO_SERIAL_LOOP_SERIAL1_BUFSIZE];
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152 #endif
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153 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL1
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154
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155 //-------------------------------------------------------------------------
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156 // Channel descriptions:
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157
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158 #ifdef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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159 #define SIZEOF_BUF(_x_) 0
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160 #else
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161 #define SIZEOF_BUF(_x_) sizeof(_x_)
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162 #endif
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163
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164 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL0
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165 #if CYGNUM_IO_SERIAL_LOOP_SERIAL0_BUFSIZE > 0
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166 static SERIAL_CHANNEL_USING_INTERRUPTS(loop_serial_channel0,
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167 loop_serial_funs,
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168 loop_serial_info0,
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169 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_LOOP_SERIAL0_BAUD),
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170 CYG_SERIAL_STOP_DEFAULT,
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171 CYG_SERIAL_PARITY_DEFAULT,
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172 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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173 CYG_SERIAL_FLAGS_DEFAULT,
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174 &loop_serial_out_buf0[0],
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175 SIZEOF_BUF(loop_serial_out_buf0),
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176 &loop_serial_in_buf0[0],
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177 SIZEOF_BUF(loop_serial_in_buf0)
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178 );
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179 #else
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180 static SERIAL_CHANNEL(loop_serial_channel0,
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181 loop_serial_funs,
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182 loop_serial_info0,
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183 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_LOOP_SERIAL0_BAUD),
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184 CYG_SERIAL_STOP_DEFAULT,
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185 CYG_SERIAL_PARITY_DEFAULT,
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186 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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187 CYG_SERIAL_FLAGS_DEFAULT
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188 );
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189 #endif
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190 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL0
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191
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192 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL1
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193 #if CYGNUM_IO_SERIAL_LOOP_SERIAL1_BUFSIZE > 0
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194 static SERIAL_CHANNEL_USING_INTERRUPTS(loop_serial_channel1,
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195 loop_serial_funs,
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196 loop_serial_info1,
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197 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_LOOP_SERIAL1_BAUD),
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198 CYG_SERIAL_STOP_DEFAULT,
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199 CYG_SERIAL_PARITY_DEFAULT,
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200 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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201 CYG_SERIAL_FLAGS_DEFAULT,
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202 &loop_serial_out_buf1[0],
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203 SIZEOF_BUF(loop_serial_out_buf1),
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204 &loop_serial_in_buf1[0],
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205 SIZEOF_BUF(loop_serial_in_buf1)
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206 );
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207 #else
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208 static SERIAL_CHANNEL(loop_serial_channel1,
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209 loop_serial_funs,
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210 loop_serial_info1,
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211 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_LOOP_SERIAL1_BAUD),
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212 CYG_SERIAL_STOP_DEFAULT,
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213 CYG_SERIAL_PARITY_DEFAULT,
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214 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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215 CYG_SERIAL_FLAGS_DEFAULT
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216 );
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217 #endif
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218 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL1
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219
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220 //-------------------------------------------------------------------------
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221 // And finally, the device table entries:
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222
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223 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL0
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224 DEVTAB_ENTRY(loop_serial_io0,
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225 CYGDAT_IO_SERIAL_LOOP_SERIAL0_NAME,
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226 0, // Does not depend on a lower level interface
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227 &cyg_io_serial_devio,
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228 loop_serial_init,
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229 loop_serial_lookup, // Serial driver may need initializing
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230 &loop_serial_channel0
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231 );
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232 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL0
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233
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234 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL1
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235 DEVTAB_ENTRY(loop_serial_io1,
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236 CYGDAT_IO_SERIAL_LOOP_SERIAL1_NAME,
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237 0, // Does not depend on a lower level interface
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238 &cyg_io_serial_devio,
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239 loop_serial_init,
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240 loop_serial_lookup, // Serial driver may need initializing
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241 &loop_serial_channel1
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242 );
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243 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL1
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244
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245 //-------------------------------------------------------------------------
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246
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247 static bool
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248 loop_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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249 {
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250 // loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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251
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252 if (new_config != &chan->config) {
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253 chan->config = *new_config;
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254 }
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255 return true;
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256 }
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257
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258 //-------------------------------------------------------------------------
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259 // Function to initialize the device. Called at bootstrap time.
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260
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261 bool loop_serial_init(struct cyg_devtab_entry *tab)
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262 {
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263 serial_channel *chan = (serial_channel *)tab->priv;
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264 // loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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265
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266 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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267
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268 #ifndef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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269
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270 // Set up alarm for feeding data back into channels
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271
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272 cyg_alarm_create( cyg_real_time_clock(),
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273 alarm_handler,
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274 0,
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275 &alarm_handle,
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276 &alarm_obj);
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277
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278 cyg_alarm_initialize( alarm_handle, 1, 1 );
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279
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280 #endif
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281
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282 loop_serial_config_port(chan, &chan->config, true);
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283
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284 return true;
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285 }
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286
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287 //-------------------------------------------------------------------------
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288 // This routine is called when the device is "looked" up (i.e. attached)
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289
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290 static Cyg_ErrNo
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291 loop_serial_lookup(struct cyg_devtab_entry **tab,
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292 struct cyg_devtab_entry *sub_tab,
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293 const char *name)
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294 {
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295 serial_channel *chan = (serial_channel *)(*tab)->priv;
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296 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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297 return ENOERR;
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298 }
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299
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300 //-------------------------------------------------------------------------
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301 // Return 'true' if character is sent to device
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302
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303 bool
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304 loop_serial_putc(serial_channel *chan, unsigned char c)
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305 {
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306 loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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307
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308 struct fifo *f = loop_chan->write_fifo;
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309
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310 if( f->num == FIFO_SIZE )
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311 return false;
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312
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313 f->buf[f->tail] = c;
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314 f->num++;
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315 f->tail++;
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316 if( f->tail == sizeof(f->buf) )
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317 f->tail = 0;
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318
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319 return true;
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320 }
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321
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322 //-------------------------------------------------------------------------
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323
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324 unsigned char
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325 loop_serial_getc(serial_channel *chan)
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326 {
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327 unsigned char c;
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328 loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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329
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330 struct fifo *f = loop_chan->read_fifo;
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331
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332 while( f->num == 0 )
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333 continue;
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334
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335 c = f->buf[f->head];
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336 f->num--;
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337 f->head++;
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338 if( f->head == sizeof(f->buf) )
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339 f->head = 0;
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340
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341 return c;
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342 }
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343
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344 //-------------------------------------------------------------------------
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345
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346 static Cyg_ErrNo
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347 loop_serial_set_config(serial_channel *chan, cyg_uint32 key,
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348 const void *xbuf, cyg_uint32 *len)
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349 {
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350 switch (key) {
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351 case CYG_IO_SET_CONFIG_SERIAL_INFO:
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352 {
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353 cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
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354 if ( *len < sizeof(cyg_serial_info_t) ) {
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355 return -EINVAL;
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356 }
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357 *len = sizeof(cyg_serial_info_t);
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358 if ( true != loop_serial_config_port(chan, config, false) )
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359 return -EINVAL;
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360 }
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361 break;
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362 default:
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363 return -EINVAL;
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364 }
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365 return ENOERR;
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366 }
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367
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368 //-------------------------------------------------------------------------
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369 // Enable the transmitter on the device
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370
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371 static void
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372 loop_serial_start_xmit(serial_channel *chan)
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373 {
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374 #ifndef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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375 loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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376
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377 loop_chan->write_fifo->tx_enable = true;
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378
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379 (chan->callbacks->xmt_char)(chan);
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380 #endif
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381 }
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382
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383 //-------------------------------------------------------------------------
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384 // Disable the transmitter on the device
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385
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386 static void
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387 loop_serial_stop_xmit(serial_channel *chan)
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388 {
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389 #ifndef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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390 loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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391
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392 loop_chan->write_fifo->tx_enable = false;
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393
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394 #endif
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395 }
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396
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397 //-------------------------------------------------------------------------
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398
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399 static void alarm_handler(cyg_handle_t alarm, cyg_addrword_t data)
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400 {
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401 serial_channel *chan0 = &loop_serial_channel0;
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402 serial_channel *chan1 = &loop_serial_channel1;
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403
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404 while( fifo0.num )
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405 {
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406 // Data ready for delivery to serial1
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407
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408 struct fifo *f = &fifo0;
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409 char c;
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410
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411 c = f->buf[f->head];
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412 f->num--;
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413 f->head++;
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414 if( f->head == sizeof(f->buf) )
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415 f->head = 0;
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416
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417 (chan1->callbacks->rcv_char)(chan1, c);
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418 if( f->tx_enable )
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419 (chan0->callbacks->xmt_char)(chan0);
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420 }
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421
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422 while( fifo1.num )
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423 {
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424 // Data ready for delivery to serial0
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425
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426 struct fifo *f = &fifo1;
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427 char c;
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428
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429 c = f->buf[f->head];
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430 f->num--;
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431 f->head++;
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432 if( f->head == sizeof(f->buf) )
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433 f->head = 0;
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434
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435 (chan0->callbacks->rcv_char)(chan0, c);
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436 if( f->tx_enable )
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437 (chan1->callbacks->xmt_char)(chan1);
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438 }
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439
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440
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441
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442 }
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443
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444
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445 #endif // CYGPKG_IO_SERIAL_LOOP
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446
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447 //-------------------------------------------------------------------------
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448 // EOF loop.c