1 | /*===============================================================*\ |
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2 | | File: termios_printk.c | |
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3 | +-----------------------------------------------------------------+ |
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4 | | Copyright (c) 2002 IMD | |
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5 | | Ingenieurbuero fuer Microcomputertechnik Th. Doerfler | |
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6 | | Hebststr. 8, 82178 Puchheim, Germany | |
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7 | | <Thomas.Doerfler@imd-systems.de> | |
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8 | | The license and distribution terms for this file may be | |
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9 | | found in the file LICENSE in this distribution or at | |
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10 | | http://www.rtems.com/license/LICENSE. | |
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11 | | all rights reserved | |
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12 | +-----------------------------------------------------------------+ |
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13 | | TERMIOS printk support | |
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14 | | this module performs low-level printk output using | |
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15 | | a polled termios driver | |
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16 | | | |
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17 | +-----------------------------------------------------------------+ |
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18 | | date history ID | |
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19 | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
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20 | | 13.05.02 creation doe | |
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21 | |*****************************************************************| |
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22 | |* $Id$ |
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23 | * |
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24 | |*****************************************************************| |
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25 | \*===============================================================*/ |
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26 | |
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27 | #ifdef HAVE_CONFIG_H |
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28 | #include "config.h" |
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29 | #endif |
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30 | |
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31 | #include <rtems.h> |
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32 | #include <rtems/libio_.h> |
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33 | #include <errno.h> |
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34 | #include <stdio.h> |
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35 | #include <fcntl.h> |
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36 | #include <termios.h> |
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37 | |
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38 | #include <rtems/termiostypes.h> |
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39 | #include <rtems/bspIo.h> |
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40 | #include <rtems/termios_printk.h> |
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41 | |
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42 | /* |
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43 | * internal variables |
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44 | */ |
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45 | int termios_printk_fd = -1; |
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46 | struct rtems_termios_tty *termios_printk_tty; |
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47 | |
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48 | static void _termios_printk_null_char( char c ) {return;} |
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49 | |
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50 | BSP_output_char_function_type BSP_output_char = _termios_printk_null_char; |
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51 | BSP_polling_getchar_function_type BSP_poll_char; |
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52 | |
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53 | /*=========================================================================*\ |
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54 | | Function: | |
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55 | \*-------------------------------------------------------------------------*/ |
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56 | void termios_printk_outputchar |
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57 | /*-------------------------------------------------------------------------*\ |
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58 | | Purpose: | |
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59 | | send one character to serial port | |
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60 | +---------------------------------------------------------------------------+ |
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61 | | Input Parameters: | |
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62 | \*-------------------------------------------------------------------------*/ |
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63 | ( |
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64 | char c /* character to print */ |
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65 | ) |
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66 | /*-------------------------------------------------------------------------*\ |
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67 | | Return Value: | |
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68 | | <none> | |
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69 | \*=========================================================================*/ |
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70 | { |
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71 | static const char cr = '\r'; |
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72 | /* |
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73 | * check, whether printk serial port is available |
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74 | */ |
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75 | |
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76 | if ((termios_printk_tty != NULL) && |
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77 | (termios_printk_tty->device.write != NULL)) { |
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78 | /* |
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79 | * call termios_printk polling callout, if available |
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80 | */ |
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81 | if (termios_printk_conf.callout != NULL) { |
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82 | termios_printk_conf.callout(); |
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83 | } |
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84 | /* |
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85 | * send character to debug serial port |
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86 | */ |
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87 | if (c == '\n') { |
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88 | termios_printk_tty->device.write(termios_printk_tty->minor,&cr,1); |
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89 | } |
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90 | termios_printk_tty->device.write(termios_printk_tty->minor,&c,1); |
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91 | } |
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92 | } |
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93 | |
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94 | /*=========================================================================*\ |
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95 | | Function: | |
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96 | \*-------------------------------------------------------------------------*/ |
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97 | char termios_printk_inputchar |
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98 | /*-------------------------------------------------------------------------*\ |
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99 | | Purpose: | |
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100 | | wait for one character from serial port | |
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101 | +---------------------------------------------------------------------------+ |
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102 | | Input Parameters: | |
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103 | \*-------------------------------------------------------------------------*/ |
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104 | ( |
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105 | void /* none */ |
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106 | ) |
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107 | /*-------------------------------------------------------------------------*\ |
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108 | | Return Value: | |
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109 | | received character | |
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110 | \*=========================================================================*/ |
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111 | { |
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112 | int c = -1; |
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113 | /* |
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114 | * check, whether debug serial port is available |
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115 | */ |
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116 | if ((termios_printk_tty != NULL) && |
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117 | (termios_printk_tty->device.pollRead != NULL)) { |
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118 | do { |
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119 | /* |
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120 | * call termios_printk polling callout, if available |
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121 | */ |
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122 | if (termios_printk_conf.callout != NULL) { |
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123 | termios_printk_conf.callout(); |
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124 | } |
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125 | /* |
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126 | * get character from debug serial port |
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127 | */ |
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128 | c = termios_printk_tty->device.pollRead(termios_printk_tty->minor); |
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129 | } while (c < 0); |
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130 | } |
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131 | return c; |
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132 | } |
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133 | |
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134 | |
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135 | /*=========================================================================*\ |
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136 | | Function: | |
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137 | \*-------------------------------------------------------------------------*/ |
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138 | int termios_printk_open |
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139 | |
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140 | /*-------------------------------------------------------------------------*\ |
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141 | | Purpose: | |
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142 | | try to open given serial debug port | |
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143 | +---------------------------------------------------------------------------+ |
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144 | | Input Parameters: | |
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145 | \*-------------------------------------------------------------------------*/ |
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146 | ( |
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147 | const char *dev_name, /* name of device to open */ |
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148 | uint32_t baudrate /* baud rate to use */ |
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149 | ) |
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150 | /*-------------------------------------------------------------------------*\ |
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151 | | Return Value: | |
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152 | | 0 on success, -1 and errno otherwise | |
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153 | \*=========================================================================*/ |
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154 | { |
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155 | boolean err_occurred = FALSE; |
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156 | rtems_libio_t *iop = NULL; |
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157 | struct termios act_termios; |
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158 | tcflag_t baudcode = B0; |
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159 | |
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160 | if (termios_printk_fd >= 0) { |
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161 | /* |
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162 | * already initialized |
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163 | */ |
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164 | return 0; |
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165 | } |
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166 | /* |
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167 | * translate baudrate into baud code |
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168 | */ |
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169 | switch(baudrate) { |
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170 | case 50: baudcode = B50; break; |
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171 | case 75: baudcode = B75; break; |
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172 | case 110: baudcode = B110; break; |
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173 | case 134: baudcode = B134; break; |
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174 | case 150: baudcode = B150; break; |
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175 | case 200: baudcode = B200; break; |
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176 | case 300: baudcode = B300; break; |
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177 | case 600: baudcode = B600; break; |
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178 | case 1200: baudcode = B1200; break; |
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179 | case 1800: baudcode = B1800; break; |
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180 | case 2400: baudcode = B2400; break; |
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181 | case 4800: baudcode = B4800; break; |
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182 | case 9600: baudcode = B9600; break; |
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183 | case 19200: baudcode = B19200; break; |
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184 | case 38400: baudcode = B38400; break; |
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185 | case 57600: baudcode = B57600; break; |
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186 | case 115200: baudcode = B115200; break; |
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187 | case 230400: baudcode = B230400; break; |
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188 | case 460800: baudcode = B460800; break; |
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189 | default : err_occurred = TRUE; errno = EINVAL; break; |
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190 | } |
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191 | /* |
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192 | * open device for serdbg operation |
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193 | */ |
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194 | if (!err_occurred && |
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195 | (dev_name != NULL) && |
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196 | (dev_name[0] != '\0')) { |
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197 | termios_printk_fd = open(dev_name,O_RDWR); |
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198 | if (termios_printk_fd < 0) { |
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199 | err_occurred = TRUE; |
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200 | } |
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201 | } |
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202 | /* |
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203 | * capture tty structure |
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204 | */ |
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205 | if (!err_occurred) { |
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206 | iop = &rtems_libio_iops[termios_printk_fd]; |
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207 | termios_printk_tty = iop->data1; |
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208 | } |
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209 | /* |
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210 | * set device baudrate |
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211 | * (and transp mode, this is not really needed) |
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212 | * ... |
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213 | */ |
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214 | /* |
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215 | * ... get fd settings |
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216 | */ |
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217 | if (!err_occurred && |
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218 | (0 != tcgetattr(termios_printk_fd,&act_termios))) { |
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219 | err_occurred = TRUE; |
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220 | } |
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221 | if (!err_occurred) { |
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222 | |
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223 | cfsetospeed(&act_termios,baudcode); |
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224 | cfsetispeed(&act_termios,baudcode); |
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225 | |
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226 | if (0 != tcsetattr(termios_printk_fd,TCSANOW,&act_termios)) { |
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227 | err_occurred = TRUE; |
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228 | } |
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229 | } |
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230 | if (!err_occurred) { |
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231 | BSP_output_char = termios_printk_outputchar; |
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232 | BSP_poll_char = termios_printk_inputchar; |
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233 | } |
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234 | return (err_occurred |
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235 | ? -1 |
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236 | : 0); |
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237 | } |
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