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annotate packages/devs/serial/loop/current/src/loop_serial.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents d2c90368aeef
children
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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 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): nickg
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43 // Contributors: nickg
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44 // Date: 1999-02-25
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45 // Purpose: Loopback serial device driver
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46 // Description: This device driver implements a pair of serial lines that are
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47 // connected back-to-back. Data output to one will appear as
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48 // input on the other. This process in in part driven by an alarm
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49 // object which provides a degree of separation between the two
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50 // channels.
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //==========================================================================
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55
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56 #include <pkgconf/hal.h>
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57 #include <pkgconf/io_serial.h>
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58 #include <pkgconf/io_serial_loop.h>
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59 #include <cyg/hal/hal_io.h>
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60
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61 #include <cyg/io/io.h>
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62 #include <cyg/io/devtab.h>
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63 #include <cyg/io/serial.h>
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64 #include <cyg/hal/hal_intr.h>
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65 #include <cyg/kernel/kapi.h>
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66
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67 #ifdef CYGPKG_IO_SERIAL_LOOP
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68
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69 //-------------------------------------------------------------------------
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70
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71 extern void diag_printf(const char *fmt, ...);
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72
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73 //-------------------------------------------------------------------------
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74 // Forward definitions
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75
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76 static bool loop_serial_init(struct cyg_devtab_entry *tab);
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77 static bool loop_serial_putc(serial_channel *chan, unsigned char c);
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78 static Cyg_ErrNo loop_serial_lookup(struct cyg_devtab_entry **tab,
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79 struct cyg_devtab_entry *sub_tab,
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80 const char *name);
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81 static unsigned char loop_serial_getc(serial_channel *chan);
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82 static Cyg_ErrNo loop_serial_set_config(serial_channel *chan, cyg_uint32 key,
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83 const void *xbuf, cyg_uint32 *len);
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84 static void loop_serial_start_xmit(serial_channel *chan);
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85 static void loop_serial_stop_xmit(serial_channel *chan);
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86
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87 #ifndef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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88 static void alarm_handler(cyg_handle_t alarm, cyg_addrword_t data);
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89 #endif
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90
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91 //-------------------------------------------------------------------------
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92 // Alarm object for feeding data back into serial channels
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93
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94 static cyg_alarm alarm_obj;
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95
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96 static cyg_handle_t alarm_handle;
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97
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98 //-------------------------------------------------------------------------
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99 // Transfer FIFOs
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100
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101 #define FIFO_SIZE 16
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102
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103 struct fifo
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104 {
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105 cyg_bool tx_enable;
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106 volatile int head;
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107 volatile int tail;
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108 volatile int num;
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109 volatile char buf[FIFO_SIZE+1];
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110 };
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111
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112 static struct fifo fifo0 = { false, 0, 0, 0 }; // from serial0 to serial1
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113 static struct fifo fifo1 = { false, 0, 0, 0 }; // from serial1 to serial0
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114
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115 //-------------------------------------------------------------------------
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116
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117 #define BUFSIZE 128
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118
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119 //-------------------------------------------------------------------------
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120 // Info for each serial device controlled
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121
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122 typedef struct loop_serial_info {
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123 struct fifo *write_fifo;
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124 struct fifo *read_fifo;
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125 } loop_serial_info;
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126
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127 //-------------------------------------------------------------------------
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128 // Callback functions exported by this driver
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129
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130 static SERIAL_FUNS(loop_serial_funs,
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131 loop_serial_putc,
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132 loop_serial_getc,
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133 loop_serial_set_config,
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134 loop_serial_start_xmit,
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135 loop_serial_stop_xmit
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136 );
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137
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138 //-------------------------------------------------------------------------
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139 // Hardware info for each serial line
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140
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141 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL0
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142 static loop_serial_info loop_serial_info0 = {
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143 &fifo0,
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144 &fifo1
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145 };
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146 #if CYGNUM_IO_SERIAL_LOOP_SERIAL0_BUFSIZE > 0
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147 static unsigned char loop_serial_out_buf0[CYGNUM_IO_SERIAL_LOOP_SERIAL0_BUFSIZE];
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148 static unsigned char loop_serial_in_buf0[CYGNUM_IO_SERIAL_LOOP_SERIAL0_BUFSIZE];
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149 #endif
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150 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL0
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151
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152 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL1
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153 static loop_serial_info loop_serial_info1 = {
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154 &fifo1,
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155 &fifo0
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156 };
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157 #if CYGNUM_IO_SERIAL_LOOP_SERIAL1_BUFSIZE > 0
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158 static unsigned char loop_serial_out_buf1[CYGNUM_IO_SERIAL_LOOP_SERIAL1_BUFSIZE];
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159 static unsigned char loop_serial_in_buf1[CYGNUM_IO_SERIAL_LOOP_SERIAL1_BUFSIZE];
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160 #endif
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161 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL1
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162
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163 //-------------------------------------------------------------------------
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164 // Channel descriptions:
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165
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166 #ifdef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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167 #define SIZEOF_BUF(_x_) 0
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168 #else
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169 #define SIZEOF_BUF(_x_) sizeof(_x_)
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170 #endif
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171
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172 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL0
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173 #if CYGNUM_IO_SERIAL_LOOP_SERIAL0_BUFSIZE > 0
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174 static SERIAL_CHANNEL_USING_INTERRUPTS(loop_serial_channel0,
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175 loop_serial_funs,
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176 loop_serial_info0,
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177 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_LOOP_SERIAL0_BAUD),
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178 CYG_SERIAL_STOP_DEFAULT,
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179 CYG_SERIAL_PARITY_DEFAULT,
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180 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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181 CYG_SERIAL_FLAGS_DEFAULT,
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182 &loop_serial_out_buf0[0],
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183 SIZEOF_BUF(loop_serial_out_buf0),
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184 &loop_serial_in_buf0[0],
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185 SIZEOF_BUF(loop_serial_in_buf0)
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186 );
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187 #else
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188 static SERIAL_CHANNEL(loop_serial_channel0,
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189 loop_serial_funs,
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190 loop_serial_info0,
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191 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_LOOP_SERIAL0_BAUD),
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192 CYG_SERIAL_STOP_DEFAULT,
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193 CYG_SERIAL_PARITY_DEFAULT,
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194 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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195 CYG_SERIAL_FLAGS_DEFAULT
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196 );
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197 #endif
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198 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL0
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199
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200 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL1
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201 #if CYGNUM_IO_SERIAL_LOOP_SERIAL1_BUFSIZE > 0
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202 static SERIAL_CHANNEL_USING_INTERRUPTS(loop_serial_channel1,
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203 loop_serial_funs,
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204 loop_serial_info1,
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205 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_LOOP_SERIAL1_BAUD),
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206 CYG_SERIAL_STOP_DEFAULT,
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207 CYG_SERIAL_PARITY_DEFAULT,
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208 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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209 CYG_SERIAL_FLAGS_DEFAULT,
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210 &loop_serial_out_buf1[0],
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211 SIZEOF_BUF(loop_serial_out_buf1),
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212 &loop_serial_in_buf1[0],
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213 SIZEOF_BUF(loop_serial_in_buf1)
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214 );
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215 #else
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216 static SERIAL_CHANNEL(loop_serial_channel1,
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217 loop_serial_funs,
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218 loop_serial_info1,
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219 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_LOOP_SERIAL1_BAUD),
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220 CYG_SERIAL_STOP_DEFAULT,
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221 CYG_SERIAL_PARITY_DEFAULT,
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222 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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223 CYG_SERIAL_FLAGS_DEFAULT
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224 );
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225 #endif
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226 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL1
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227
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228 //-------------------------------------------------------------------------
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229 // And finally, the device table entries:
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230
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231 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL0
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232 DEVTAB_ENTRY(loop_serial_io0,
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233 CYGDAT_IO_SERIAL_LOOP_SERIAL0_NAME,
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234 0, // Does not depend on a lower level interface
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235 &cyg_io_serial_devio,
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236 loop_serial_init,
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237 loop_serial_lookup, // Serial driver may need initializing
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238 &loop_serial_channel0
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239 );
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240 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL0
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241
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242 #ifdef CYGPKG_IO_SERIAL_LOOP_SERIAL1
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243 DEVTAB_ENTRY(loop_serial_io1,
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244 CYGDAT_IO_SERIAL_LOOP_SERIAL1_NAME,
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245 0, // Does not depend on a lower level interface
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246 &cyg_io_serial_devio,
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247 loop_serial_init,
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248 loop_serial_lookup, // Serial driver may need initializing
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249 &loop_serial_channel1
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250 );
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251 #endif // CYGPKG_IO_SERIAL_LOOP_SERIAL1
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252
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253 //-------------------------------------------------------------------------
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254
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255 static bool
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256 loop_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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257 {
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258 // loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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259
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260 if (new_config != &chan->config) {
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261 chan->config = *new_config;
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262 }
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263 return true;
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264 }
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265
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266 //-------------------------------------------------------------------------
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267 // Function to initialize the device. Called at bootstrap time.
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268
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269 bool loop_serial_init(struct cyg_devtab_entry *tab)
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270 {
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271 serial_channel *chan = (serial_channel *)tab->priv;
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272 // loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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273
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274 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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275
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276 #ifndef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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277
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278 // Set up alarm for feeding data back into channels
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279
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280 cyg_alarm_create( cyg_real_time_clock(),
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281 alarm_handler,
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282 0,
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283 &alarm_handle,
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284 &alarm_obj);
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285
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286 cyg_alarm_initialize( alarm_handle, 1, 1 );
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287
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288 #endif
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289
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290 loop_serial_config_port(chan, &chan->config, true);
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291
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292 return true;
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293 }
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294
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295 //-------------------------------------------------------------------------
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296 // This routine is called when the device is "looked" up (i.e. attached)
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297
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298 static Cyg_ErrNo
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299 loop_serial_lookup(struct cyg_devtab_entry **tab,
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300 struct cyg_devtab_entry *sub_tab,
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301 const char *name)
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302 {
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303 serial_channel *chan = (serial_channel *)(*tab)->priv;
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304 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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305 return ENOERR;
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306 }
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307
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308 //-------------------------------------------------------------------------
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309 // Return 'true' if character is sent to device
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310
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311 bool
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312 loop_serial_putc(serial_channel *chan, unsigned char c)
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313 {
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314 loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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315
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316 struct fifo *f = loop_chan->write_fifo;
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317
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318 if( f->num == FIFO_SIZE )
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319 return false;
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320
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321 f->buf[f->tail] = c;
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322 f->num++;
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323 f->tail++;
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324 if( f->tail == sizeof(f->buf) )
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325 f->tail = 0;
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326
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327 return true;
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328 }
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329
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330 //-------------------------------------------------------------------------
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331
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332 unsigned char
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333 loop_serial_getc(serial_channel *chan)
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334 {
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335 unsigned char c;
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336 loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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337
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338 struct fifo *f = loop_chan->read_fifo;
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339
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340 while( f->num == 0 )
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341 continue;
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342
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343 c = f->buf[f->head];
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344 f->num--;
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345 f->head++;
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346 if( f->head == sizeof(f->buf) )
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347 f->head = 0;
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348
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349 return c;
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350 }
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351
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352 //-------------------------------------------------------------------------
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353
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354 static Cyg_ErrNo
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355 loop_serial_set_config(serial_channel *chan, cyg_uint32 key,
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356 const void *xbuf, cyg_uint32 *len)
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357 {
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358 switch (key) {
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359 case CYG_IO_SET_CONFIG_SERIAL_INFO:
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360 {
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361 cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
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362 if ( *len < sizeof(cyg_serial_info_t) ) {
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363 return -EINVAL;
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364 }
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365 *len = sizeof(cyg_serial_info_t);
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366 if ( true != loop_serial_config_port(chan, config, false) )
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367 return -EINVAL;
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368 }
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369 break;
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370 default:
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371 return -EINVAL;
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372 }
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373 return ENOERR;
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374 }
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375
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376 //-------------------------------------------------------------------------
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377 // Enable the transmitter on the device
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378
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379 static void
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380 loop_serial_start_xmit(serial_channel *chan)
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381 {
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382 #ifndef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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383 loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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384
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385 loop_chan->write_fifo->tx_enable = true;
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386
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387 (chan->callbacks->xmt_char)(chan);
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388 #endif
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389 }
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390
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391 //-------------------------------------------------------------------------
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392 // Disable the transmitter on the device
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393
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394 static void
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395 loop_serial_stop_xmit(serial_channel *chan)
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396 {
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397 #ifndef CYGPKG_IO_SERIAL_LOOP_POLLED_MODE
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398 loop_serial_info *loop_chan = (loop_serial_info *)chan->dev_priv;
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399
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400 loop_chan->write_fifo->tx_enable = false;
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401
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402 #endif
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403 }
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404
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405 //-------------------------------------------------------------------------
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406
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407 static void alarm_handler(cyg_handle_t alarm, cyg_addrword_t data)
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408 {
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409 serial_channel *chan0 = &loop_serial_channel0;
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410 serial_channel *chan1 = &loop_serial_channel1;
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411
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412 while( fifo0.num )
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413 {
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414 // Data ready for delivery to serial1
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415
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416 struct fifo *f = &fifo0;
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417 char c;
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418
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419 c = f->buf[f->head];
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420 f->num--;
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421 f->head++;
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422 if( f->head == sizeof(f->buf) )
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423 f->head = 0;
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424
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425 (chan1->callbacks->rcv_char)(chan1, c);
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426 if( f->tx_enable )
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427 (chan0->callbacks->xmt_char)(chan0);
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428 }
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429
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430 while( fifo1.num )
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431 {
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432 // Data ready for delivery to serial0
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433
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434 struct fifo *f = &fifo1;
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435 char c;
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436
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437 c = f->buf[f->head];
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438 f->num--;
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439 f->head++;
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440 if( f->head == sizeof(f->buf) )
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441 f->head = 0;
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442
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443 (chan0->callbacks->rcv_char)(chan0, c);
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444 if( f->tx_enable )
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445 (chan1->callbacks->xmt_char)(chan1);
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446 }
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447
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448
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449
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450 }
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451
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452
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453 #endif // CYGPKG_IO_SERIAL_LOOP
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454
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455 //-------------------------------------------------------------------------
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456 // EOF loop.c