1 | /* |
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2 | * This file contains the Force CPU386 console IO package. |
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3 | * |
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4 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * All rights assigned to U.S. Government, 1994. |
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7 | * |
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8 | * This material may be reproduced by or for the U.S. Government pursuant |
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9 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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10 | * notice must appear in all copies of this file and its derivatives. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #define F386_INIT |
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16 | |
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17 | #include <stdlib.h> |
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18 | |
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19 | #include <rtems.h> |
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20 | #include "console.h" |
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21 | #include "bsp.h" |
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22 | |
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23 | /* console_cleanup |
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24 | * |
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25 | * This routine is called at exit to clean up the console hardware. |
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26 | * |
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27 | * Input parameters: NONE |
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28 | * |
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29 | * Output parameters: NONE |
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30 | * |
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31 | * Return values: |
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32 | */ |
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33 | |
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34 | void console_cleanup( void ) |
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35 | { |
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36 | register rtems_unsigned8 ignored; |
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37 | /* |
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38 | * FORCE technical support mentioned that it may be necessary to |
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39 | * read the DUSCC RX_BUFFER port four times to remove all junk. |
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40 | * This code is a little more paranoid. |
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41 | */ |
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42 | |
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43 | inport_byte( RX_BUFFER, ignored ); |
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44 | inport_byte( RX_BUFFER, ignored ); |
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45 | inport_byte( RX_BUFFER, ignored ); |
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46 | inport_byte( RX_BUFFER, ignored ); |
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47 | inport_byte( RX_BUFFER, ignored ); |
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48 | } |
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49 | |
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50 | /* console_initialize |
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51 | * |
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52 | * This routine initializes the console IO driver. |
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53 | * |
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54 | * Input parameters: NONE |
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55 | * |
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56 | * Output parameters: NONE |
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57 | * |
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58 | * Return values: |
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59 | */ |
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60 | |
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61 | rtems_device_driver console_initialize( |
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62 | rtems_device_major_number major, |
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63 | rtems_device_minor_number minor, |
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64 | void *arg, |
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65 | rtems_id self, |
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66 | rtems_unsigned32 *status |
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67 | ) |
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68 | { |
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69 | /* |
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70 | * flush the console now and at exit. Just in case. |
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71 | */ |
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72 | |
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73 | console_cleanup(); |
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74 | |
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75 | atexit( console_cleanup ); |
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76 | } |
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77 | |
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78 | |
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79 | /* is_character_ready |
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80 | * |
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81 | * This routine returns TRUE if a character is available. |
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82 | * |
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83 | * Input parameters: NONE |
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84 | * |
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85 | * Output parameters: NONE |
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86 | * |
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87 | * Return values: |
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88 | */ |
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89 | |
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90 | rtems_boolean is_character_ready( |
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91 | char *ch |
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92 | ) |
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93 | { |
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94 | register rtems_unsigned8 status; |
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95 | |
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96 | inport_byte( RX_STATUS, status ); |
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97 | |
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98 | if ( Is_rx_ready( status ) ) { |
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99 | inport_byte( RX_BUFFER, status ); |
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100 | *ch = status; |
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101 | return TRUE; |
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102 | } |
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103 | return FALSE; |
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104 | } |
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105 | |
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106 | /* inbyte |
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107 | * |
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108 | * This routine reads a character from the UART. |
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109 | * |
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110 | * Input parameters: NONE |
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111 | * |
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112 | * Output parameters: NONE |
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113 | * |
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114 | * Return values: |
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115 | * character read from UART |
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116 | */ |
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117 | |
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118 | char inbyte( void ) |
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119 | { |
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120 | register rtems_unsigned8 status; |
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121 | char ch; |
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122 | |
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123 | do { |
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124 | inport_byte( RX_STATUS, status ); |
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125 | } while ( !Is_rx_ready( status ) ); |
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126 | |
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127 | #if ( PORTB == 1 ) |
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128 | /* |
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129 | * Force example code resets the Channel B Receiver here. |
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130 | * It appears to cause XON's to be lost. |
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131 | */ |
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132 | |
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133 | /* outport_byte( RX_STATUS, 0x10 ); */ |
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134 | #endif |
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135 | |
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136 | inport_byte( RX_BUFFER, ch ); |
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137 | |
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138 | return ch; |
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139 | } |
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140 | |
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141 | /* outbyte |
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142 | * |
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143 | * This routine transmits a character out the port. It supports |
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144 | * XON/XOFF flow control. |
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145 | * |
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146 | * Input parameters: |
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147 | * ch - character to be transmitted |
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148 | * |
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149 | * Output parameters: NONE |
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150 | */ |
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151 | |
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152 | void outbyte( |
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153 | char ch |
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154 | ) |
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155 | { |
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156 | rtems_unsigned8 status; |
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157 | |
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158 | do { |
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159 | inport_byte( TX_STATUS, status ); |
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160 | } while ( !Is_tx_ready( status ) ); |
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161 | |
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162 | #if 0 |
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163 | while ( is_character_ready( &status ) == TRUE ) { /* must be an XOFF */ |
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164 | if ( status == XOFF ) |
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165 | do { |
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166 | while ( is_character_ready( &status ) == FALSE ) ; |
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167 | } while ( status != XON ); |
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168 | } |
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169 | #endif |
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170 | |
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171 | outport_byte( TX_BUFFER, ch ); |
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172 | } |
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173 | |
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174 | /* |
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175 | * __read -- read bytes from the serial port. Ignore fd, since |
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176 | * we only have stdin. |
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177 | */ |
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178 | |
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179 | int __read( |
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180 | int fd, |
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181 | char *buf, |
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182 | int nbytes |
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183 | ) |
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184 | { |
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185 | int i = 0; |
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186 | |
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187 | for (i = 0; i < nbytes; i++) { |
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188 | *(buf + i) = inbyte(); |
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189 | if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) { |
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190 | (*(buf + i++)) = '\n'; |
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191 | (*(buf + i)) = 0; |
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192 | break; |
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193 | } |
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194 | } |
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195 | return (i); |
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196 | } |
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197 | |
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198 | /* |
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199 | * __write -- write bytes to the serial port. Ignore fd, since |
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200 | * stdout and stderr are the same. Since we have no filesystem, |
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201 | * open will only return an error. |
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202 | */ |
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203 | |
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204 | int __write( |
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205 | int fd, |
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206 | char *buf, |
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207 | int nbytes |
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208 | ) |
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209 | { |
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210 | int i; |
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211 | |
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212 | for (i = 0; i < nbytes; i++) { |
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213 | if (*(buf + i) == '\n') { |
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214 | outbyte ('\r'); |
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215 | } |
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216 | outbyte (*(buf + i)); |
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217 | } |
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218 | return (nbytes); |
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219 | } |
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