1 | /* |
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2 | * This file contains the TTY driver for the serial ports on the erc32. |
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3 | * |
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4 | * This driver uses the termios pseudo driver. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1997. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * Copyright assigned to U.S. Government, 1994. |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #include <bsp.h> |
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18 | #include <rtems/libio.h> |
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19 | #include <stdlib.h> |
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20 | #include <assert.h> |
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21 | |
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22 | /* |
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23 | * Should we use a polled or interrupt drived console? |
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24 | * |
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25 | * NOTE: This is defined in the custom/erc32.cfg file. |
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26 | * |
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27 | * WARNING: In sis 1.6, it did not appear that the UART interrupts |
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28 | * worked in a desirable fashion. Immediately upon writing |
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29 | * a character into the TX buffer, an interrupt was generated. |
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30 | * This did not allow enough time for the program to put more |
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31 | * characters in the buffer. So every character resulted in |
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32 | * "priming" the transmitter. This effectively results in |
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33 | * in a polled console with a useless interrupt per character |
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34 | * on output. It is reasonable to assume that input does not |
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35 | * share this problem although it was not investigated. |
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36 | * |
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37 | */ |
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38 | |
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39 | /* |
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40 | * console_outbyte_polled |
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41 | * |
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42 | * This routine transmits a character using polling. |
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43 | */ |
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44 | |
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45 | void console_outbyte_polled( |
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46 | int port, |
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47 | char ch |
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48 | ) |
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49 | { |
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50 | if ( port == 0 ) { |
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51 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA) == 0 ); |
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52 | ERC32_MEC.UART_Channel_A = (int) ch; |
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53 | return; |
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54 | } |
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55 | |
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56 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB) == 0 ); |
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57 | ERC32_MEC.UART_Channel_B = (int) ch; |
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58 | } |
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59 | |
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60 | /* |
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61 | * console_inbyte_nonblocking |
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62 | * |
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63 | * This routine polls for a character. |
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64 | */ |
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65 | |
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66 | int console_inbyte_nonblocking( |
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67 | int port, |
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68 | char *c |
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69 | ) |
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70 | { |
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71 | int UStat; |
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72 | |
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73 | UStat = ERC32_MEC.UART_Status; |
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74 | |
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75 | switch (port) { |
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76 | |
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77 | case 0: |
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78 | if (UStat & ERC32_MEC_UART_STATUS_ERRA) { |
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79 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA; |
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80 | ERC32_MEC.Control = ERC32_MEC.Control; |
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81 | } |
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82 | |
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83 | if ((UStat & ERC32_MEC_UART_STATUS_DRA) == 0) |
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84 | return 0; |
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85 | *c = (char) ERC32_MEC.UART_Channel_A; |
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86 | return 1; |
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87 | |
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88 | case 1: |
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89 | if (UStat & ERC32_MEC_UART_STATUS_ERRB) { |
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90 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB; |
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91 | ERC32_MEC.Control = ERC32_MEC.Control; |
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92 | } |
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93 | |
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94 | if ((UStat & ERC32_MEC_UART_STATUS_DRB) == 0) |
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95 | return 0; |
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96 | *c = (char) ERC32_MEC.UART_Channel_B; |
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97 | return 1; |
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98 | |
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99 | default: |
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100 | assert( 0 ); |
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101 | } |
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102 | |
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103 | return 0; |
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104 | } |
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105 | |
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106 | /* |
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107 | * Interrupt driven console IO |
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108 | */ |
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109 | |
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110 | #ifdef CONSOLE_USE_INTERRUPTS |
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111 | |
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112 | /* |
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113 | * Buffers between task and ISRs |
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114 | */ |
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115 | |
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116 | #include <ringbuf.h> |
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117 | |
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118 | Ring_buffer_t TX_Buffer[ 2 ]; |
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119 | boolean Is_TX_active[ 2 ]; |
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120 | |
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121 | void *console_termios_data[ 2 ]; |
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122 | |
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123 | /* |
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124 | * console_isr_a |
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125 | * |
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126 | * This routine is the console interrupt handler for Channel A. |
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127 | * |
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128 | * Input parameters: |
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129 | * vector - vector number |
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130 | * |
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131 | * Output parameters: NONE |
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132 | * |
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133 | * Return values: NONE |
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134 | */ |
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135 | |
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136 | rtems_isr console_isr_a( |
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137 | rtems_vector_number vector |
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138 | ) |
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139 | { |
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140 | char ch; |
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141 | int UStat; |
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142 | |
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143 | if ( (UStat = ERC32_MEC.UART_Status) & ERC32_MEC_UART_STATUS_DRA ) { |
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144 | if (UStat & ERC32_MEC_UART_STATUS_ERRA) { |
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145 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA; |
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146 | ERC32_MEC.Control = ERC32_MEC.Control; |
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147 | } |
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148 | ch = ERC32_MEC.UART_Channel_A; |
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149 | |
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150 | rtems_termios_enqueue_raw_characters( console_termios_data[ 0 ], &ch, 1 ); |
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151 | } |
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152 | |
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153 | if ( ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA ) { |
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154 | if ( !Ring_buffer_Is_empty( &TX_Buffer[ 0 ] ) ) { |
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155 | Ring_buffer_Remove_character( &TX_Buffer[ 0 ], ch ); |
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156 | ERC32_MEC.UART_Channel_A = (unsigned32) ch; |
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157 | } else |
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158 | Is_TX_active[ 0 ] = FALSE; |
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159 | } |
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160 | |
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161 | ERC32_Clear_interrupt( ERC32_INTERRUPT_UART_A_RX_TX ); |
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162 | } |
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163 | |
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164 | /* |
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165 | * console_isr_b |
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166 | * |
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167 | * This routine is the console interrupt handler for Channel B. |
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168 | * |
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169 | * Input parameters: |
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170 | * vector - vector number |
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171 | * |
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172 | * Output parameters: NONE |
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173 | * |
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174 | * Return values: NONE |
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175 | */ |
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176 | |
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177 | rtems_isr console_isr_b( |
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178 | rtems_vector_number vector |
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179 | ) |
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180 | { |
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181 | char ch; |
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182 | int UStat; |
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183 | |
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184 | if ( (UStat = ERC32_MEC.UART_Status) & ERC32_MEC_UART_STATUS_DRB ) { |
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185 | if (UStat & ERC32_MEC_UART_STATUS_ERRB) { |
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186 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB; |
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187 | ERC32_MEC.Control = ERC32_MEC.Control; |
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188 | } |
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189 | ch = ERC32_MEC.UART_Channel_B; |
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190 | rtems_termios_enqueue_raw_characters( console_termios_data[ 1 ], &ch, 1 ); |
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191 | |
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192 | } |
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193 | |
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194 | if ( ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB ) { |
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195 | if ( !Ring_buffer_Is_empty( &TX_Buffer[ 1 ] ) ) { |
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196 | Ring_buffer_Remove_character( &TX_Buffer[ 1 ], ch ); |
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197 | ERC32_MEC.UART_Channel_B = (unsigned32) ch; |
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198 | } else |
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199 | Is_TX_active[ 1 ] = FALSE; |
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200 | } |
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201 | |
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202 | ERC32_Clear_interrupt( ERC32_INTERRUPT_UART_B_RX_TX ); |
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203 | } |
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204 | |
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205 | /* |
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206 | * console_exit |
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207 | * |
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208 | * This routine allows the console to exit by masking its associated interrupt |
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209 | * vectors. |
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210 | * |
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211 | * Input parameters: NONE |
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212 | * |
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213 | * Output parameters: NONE |
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214 | * |
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215 | * Return values: NONE |
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216 | */ |
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217 | |
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218 | void console_exit() |
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219 | { |
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220 | rtems_unsigned32 port; |
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221 | rtems_unsigned32 ch; |
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222 | |
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223 | /* |
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224 | * Although the interrupts for the UART are unmasked, the PIL is set to |
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225 | * disable all external interrupts. So we might as well do this first. |
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226 | */ |
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227 | |
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228 | ERC32_Mask_interrupt( ERC32_INTERRUPT_UART_A_RX_TX ); |
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229 | ERC32_Mask_interrupt( ERC32_INTERRUPT_UART_B_RX_TX ); |
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230 | |
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231 | for ( port=0 ; port <= 1 ; port++ ) { |
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232 | while ( !Ring_buffer_Is_empty( &TX_Buffer[ port ] ) ) { |
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233 | Ring_buffer_Remove_character( &TX_Buffer[ port ], ch ); |
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234 | console_outbyte_polled( port, ch ); |
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235 | } |
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236 | } |
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237 | |
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238 | /* |
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239 | * Now wait for all the data to actually get out ... the send register |
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240 | * should be empty. |
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241 | */ |
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242 | |
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243 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA) != |
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244 | ERC32_MEC_UART_STATUS_THEA ); |
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245 | |
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246 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB) != |
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247 | ERC32_MEC_UART_STATUS_THEB ); |
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248 | |
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249 | } |
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250 | |
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251 | #define CONSOLE_UART_A_TRAP ERC32_TRAP_TYPE( ERC32_INTERRUPT_UART_A_RX_TX ) |
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252 | #define CONSOLE_UART_B_TRAP ERC32_TRAP_TYPE( ERC32_INTERRUPT_UART_B_RX_TX ) |
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253 | |
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254 | /* |
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255 | * console_initialize_interrupts |
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256 | * |
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257 | * This routine initializes the console's receive and transmit |
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258 | * ring buffers and loads the appropriate vectors to handle the interrupts. |
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259 | * |
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260 | * Input parameters: NONE |
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261 | * |
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262 | * Output parameters: NONE |
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263 | * |
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264 | * Return values: NONE |
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265 | */ |
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266 | |
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267 | #ifdef RDB_BREAK_IN |
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268 | extern unsigned32 trap_table[]; |
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269 | #endif |
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270 | |
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271 | void console_initialize_interrupts( void ) |
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272 | { |
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273 | Ring_buffer_Initialize( &TX_Buffer[ 0 ] ); |
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274 | Ring_buffer_Initialize( &TX_Buffer[ 1 ] ); |
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275 | |
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276 | Is_TX_active[ 0 ] = FALSE; |
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277 | Is_TX_active[ 1 ] = FALSE; |
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278 | |
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279 | atexit( console_exit ); |
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280 | |
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281 | set_vector( console_isr_a, CONSOLE_UART_A_TRAP, 1 ); |
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282 | #ifdef RDB_BREAK_IN |
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283 | if (trap_table[0x150/4] == 0x91d02000) |
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284 | #endif |
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285 | set_vector( console_isr_b, CONSOLE_UART_B_TRAP, 1 ); |
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286 | } |
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287 | |
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288 | /* |
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289 | * console_outbyte_interrupts |
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290 | * |
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291 | * This routine transmits a character out. |
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292 | * |
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293 | * Input parameters: |
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294 | * port - port to transmit character to |
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295 | * ch - character to be transmitted |
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296 | * |
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297 | * Output parameters: NONE |
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298 | * |
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299 | * Return values: NONE |
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300 | */ |
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301 | |
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302 | void console_outbyte_interrupts( |
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303 | int port, |
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304 | char ch |
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305 | ) |
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306 | { |
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307 | /* |
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308 | * If this is the first character then we need to prime the pump |
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309 | */ |
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310 | |
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311 | if ( Is_TX_active[ port ] == FALSE ) { |
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312 | Is_TX_active[ port ] = TRUE; |
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313 | console_outbyte_polled( port, ch ); |
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314 | return; |
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315 | } |
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316 | |
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317 | while ( Ring_buffer_Is_full( &TX_Buffer[ port ] ) ); |
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318 | |
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319 | Ring_buffer_Add_character( &TX_Buffer[ port ], ch ); |
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320 | } |
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321 | |
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322 | #endif /* CONSOLE_USE_INTERRUPTS */ |
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323 | |
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324 | /* |
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325 | * DEBUG_puts |
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326 | * |
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327 | * This should be safe in the event of an error. It attempts to insure |
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328 | * that no TX empty interrupts occur while it is doing polled IO. Then |
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329 | * it restores the state of that external interrupt. |
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330 | * |
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331 | * Input parameters: |
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332 | * string - pointer to debug output string |
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333 | * |
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334 | * Output parameters: NONE |
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335 | * |
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336 | * Return values: NONE |
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337 | */ |
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338 | |
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339 | void DEBUG_puts( |
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340 | char *string |
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341 | ) |
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342 | { |
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343 | char *s; |
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344 | unsigned32 old_level; |
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345 | |
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346 | ERC32_Disable_interrupt( ERC32_INTERRUPT_UART_A_RX_TX, old_level ); |
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347 | for ( s = string ; *s ; s++ ) |
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348 | console_outbyte_polled( 0, *s ); |
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349 | |
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350 | console_outbyte_polled( 0, '\r' ); |
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351 | console_outbyte_polled( 0, '\n' ); |
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352 | ERC32_Restore_interrupt( ERC32_INTERRUPT_UART_A_RX_TX, old_level ); |
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353 | } |
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354 | |
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355 | |
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356 | /* |
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357 | * Console Termios Support Entry Points |
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358 | * |
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359 | */ |
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360 | |
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361 | int console_write_support (int minor, char *buf, int len) |
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362 | { |
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363 | int nwrite = 0; |
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364 | |
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365 | while (nwrite < len) { |
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366 | #if defined(CONSOLE_USE_INTERRUPTS) |
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367 | console_outbyte_interrupt( minor, *buf++ ); |
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368 | #else |
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369 | console_outbyte_polled( minor, *buf++ ); |
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370 | #endif |
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371 | nwrite++; |
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372 | } |
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373 | return nwrite; |
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374 | } |
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375 | |
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376 | void console_reserve_resources( |
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377 | rtems_configuration_table *configuration |
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378 | ) |
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379 | { |
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380 | rtems_termios_reserve_resources( configuration, 2 ); |
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381 | } |
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382 | |
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383 | /* |
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384 | * Console Device Driver Entry Points |
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385 | * |
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386 | */ |
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387 | |
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388 | rtems_device_driver console_initialize( |
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389 | rtems_device_major_number major, |
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390 | rtems_device_minor_number minor, |
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391 | void *arg |
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392 | ) |
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393 | { |
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394 | rtems_status_code status; |
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395 | |
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396 | rtems_termios_initialize(); |
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397 | |
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398 | /* |
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399 | * Register Device Names |
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400 | */ |
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401 | |
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402 | status = rtems_io_register_name( "/dev/console", major, 0 ); |
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403 | if (status != RTEMS_SUCCESSFUL) |
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404 | rtems_fatal_error_occurred(status); |
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405 | |
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406 | status = rtems_io_register_name( "/dev/console_b", major, 1 ); |
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407 | if (status != RTEMS_SUCCESSFUL) |
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408 | rtems_fatal_error_occurred(status); |
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409 | |
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410 | /* |
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411 | * Initialize Hardware |
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412 | */ |
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413 | |
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414 | #ifdef CONSOLE_USE_INTERRUPTS |
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415 | console_initialize_interrupts(); |
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416 | #endif |
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417 | |
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418 | return RTEMS_SUCCESSFUL; |
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419 | } |
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420 | |
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421 | rtems_device_driver console_open( |
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422 | rtems_device_major_number major, |
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423 | rtems_device_minor_number minor, |
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424 | void * arg |
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425 | ) |
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426 | { |
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427 | rtems_status_code sc; |
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428 | #if defined(CONSOLE_USE_INTERRUPTS) |
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429 | rtems_libio_open_close_args_t *args = arg; |
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430 | #endif |
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431 | |
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432 | assert( minor <= 1 ); |
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433 | if ( minor > 2 ) |
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434 | return RTEMS_INVALID_NUMBER; |
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435 | |
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436 | #if defined(CONSOLE_USE_INTERRUPTS) |
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437 | sc = rtems_termios_open (major, minor, arg, |
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438 | NULL, |
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439 | NULL, |
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440 | NULL, |
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441 | console_write_support); |
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442 | |
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443 | console_termios_data[ minor ] = args->iop->data1; |
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444 | #else |
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445 | sc = rtems_termios_open (major, minor, arg, |
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446 | NULL, |
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447 | NULL, |
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448 | console_inbyte_nonblocking, |
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449 | console_write_support); |
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450 | #endif |
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451 | |
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452 | return RTEMS_SUCCESSFUL; |
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453 | } |
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454 | |
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455 | rtems_device_driver console_close( |
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456 | rtems_device_major_number major, |
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457 | rtems_device_minor_number minor, |
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458 | void * arg |
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459 | ) |
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460 | { |
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461 | return rtems_termios_close (arg); |
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462 | } |
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463 | |
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464 | rtems_device_driver console_read( |
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465 | rtems_device_major_number major, |
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466 | rtems_device_minor_number minor, |
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467 | void * arg |
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468 | ) |
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469 | { |
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470 | return rtems_termios_read (arg); |
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471 | } |
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472 | |
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473 | rtems_device_driver console_write( |
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474 | rtems_device_major_number major, |
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475 | rtems_device_minor_number minor, |
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476 | void * arg |
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477 | ) |
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478 | { |
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479 | return rtems_termios_write (arg); |
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480 | } |
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481 | |
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482 | rtems_device_driver console_control( |
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483 | rtems_device_major_number major, |
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484 | rtems_device_minor_number minor, |
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485 | void * arg |
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486 | ) |
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487 | { |
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488 | return rtems_termios_ioctl (arg); |
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489 | } |
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490 | |
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