1 | /* |
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2 | * Initialize SMC1 for console IO. |
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3 | * |
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4 | * Based on the `gen68302' board support package, and covered by the |
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5 | * original distribution terms. |
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6 | * |
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7 | * W. Eric Norum |
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8 | * Saskatchewan Accelerator Laboratory |
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9 | * University of Saskatchewan |
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10 | * Saskatoon, Saskatchewan, CANADA |
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11 | * eric@skatter.usask.ca |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | /* |
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17 | * |
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18 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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19 | * On-Line Applications Research Corporation (OAR). |
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20 | * All rights assigned to U.S. Government, 1994. |
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21 | * |
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22 | * This material may be reproduced by or for the U.S. Government pursuant |
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23 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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24 | * notice must appear in all copies of this file and its derivatives. |
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25 | */ |
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26 | |
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27 | #define GEN68360_INIT |
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28 | |
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29 | #include <bsp.h> |
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30 | #include <rtems/libio.h> |
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31 | #include "m68360.h" |
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32 | |
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33 | /* console_initialize |
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34 | * |
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35 | * This routine initializes the console IO driver. |
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36 | * |
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37 | * Input parameters: NONE |
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38 | * |
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39 | * Output parameters: NONE |
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40 | * |
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41 | * Return values: |
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42 | */ |
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43 | |
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44 | /* |
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45 | * Place buffer descriptors at end of User Data/BD space in dual-port RAM |
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46 | */ |
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47 | #define consoleRxBd ((volatile m360BufferDescriptor_t *)((char *)m360.dpram1 + \ |
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48 | (sizeof(m360.dpram2) - 2*sizeof(m360BufferDescriptor_t)))) |
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49 | #define consoleTxBd ((volatile m360BufferDescriptor_t *)((char *)m360.dpram1 + \ |
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50 | (sizeof(m360.dpram2) - sizeof(m360BufferDescriptor_t)))) |
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51 | |
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52 | /* |
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53 | * I/O buffers can be in ordindary RAM |
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54 | */ |
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55 | static volatile char rxBuf, txBuf; |
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56 | |
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57 | rtems_device_driver console_initialize( |
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58 | rtems_device_major_number major, |
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59 | rtems_device_minor_number minor, |
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60 | void *arg |
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61 | ) |
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62 | { |
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63 | rtems_status_code status; |
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64 | |
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65 | /* |
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66 | * Configure port B pins to enable SMTXD1 and SMRXD1 pins |
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67 | */ |
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68 | m360.pbpar |= 0xC0; |
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69 | m360.pbdir &= ~0xC0; |
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70 | m360.pbodr &= ~0xC0; |
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71 | |
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72 | /* |
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73 | * Set up BRG1 (9,600 baud) |
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74 | */ |
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75 | m360.brgc1 = M360_BRG_RST; |
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76 | m360.brgc1 = M360_BRG_EN | M360_BRG_EXTC_BRGCLK | M360_BRG_9600; |
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77 | |
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78 | /* |
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79 | * Put SMC1 in NMSI mode, connect SMC1 to BRG1 |
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80 | */ |
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81 | m360.simode |= M360_SI_SMC1_BRG1; |
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82 | |
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83 | /* |
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84 | * Set up SMC1 parameter RAM common to all protocols |
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85 | */ |
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86 | m360.smc1p.rbase = (char *)consoleRxBd - (char *)&m360; |
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87 | m360.smc1p.tbase = (char *)consoleTxBd - (char *)&m360; |
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88 | m360.smc1p.rfcr = M360_RFCR_MOT | M360_RFCR_DMA_SPACE; |
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89 | m360.smc1p.tfcr = M360_TFCR_MOT | M360_TFCR_DMA_SPACE; |
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90 | m360.smc1p.mrblr = 1; |
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91 | |
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92 | /* |
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93 | * Set up SMC1 parameter RAM UART-specific parameters |
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94 | */ |
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95 | m360.smc1p.un.uart.max_idl = 0; |
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96 | m360.smc1p.un.uart.brklen = 0; |
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97 | m360.smc1p.un.uart.brkec = 0; |
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98 | m360.smc1p.un.uart.brkcr = 0; |
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99 | |
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100 | /* |
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101 | * Set up the Receive Buffer Descriptor |
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102 | */ |
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103 | consoleRxBd->status = M360_BD_EMPTY | M360_BD_WRAP; |
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104 | consoleRxBd->length = 0; |
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105 | consoleRxBd->buffer = &rxBuf; |
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106 | |
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107 | /* |
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108 | * Setup the Transmit Buffer Descriptor |
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109 | */ |
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110 | consoleTxBd->length = 1; |
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111 | consoleTxBd->status = M360_BD_WRAP; |
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112 | consoleTxBd->buffer = &txBuf; |
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113 | |
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114 | /* |
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115 | * Set up SMC1 general and protocol-specific mode registers |
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116 | */ |
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117 | m360.smc1.smce = ~0; /* Clear any pending events */ |
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118 | m360.smc1.smcm = 0; /* Mask all interrupt/event sources */ |
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119 | m360.smc1.smcmr = M360_SMCMR_CLEN(9) | M360_SMCMR_SM_UART; |
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120 | |
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121 | /* |
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122 | * Send "Init parameters" command |
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123 | */ |
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124 | m360.cr = M360_CR_OP_INIT_RX_TX | M360_CR_CHAN_SMC1 | M360_CR_FLG; |
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125 | while (m360.cr & M360_CR_FLG) |
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126 | continue; |
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127 | |
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128 | /* |
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129 | * Enable receiver and transmitter |
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130 | */ |
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131 | m360.smc1.smcmr |= M360_SMCMR_TEN | M360_SMCMR_REN; |
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132 | |
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133 | status = rtems_io_register_name( |
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134 | "/dev/console", |
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135 | major, |
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136 | (rtems_device_minor_number)0); |
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137 | if (status != RTEMS_SUCCESSFUL) |
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138 | rtems_fatal_error_occurred(status); |
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139 | return RTEMS_SUCCESSFUL; |
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140 | } |
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141 | |
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142 | /* is_character_ready |
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143 | * |
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144 | * Check to see if a character is available on the console port. If so, |
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145 | * then return a TRUE (along with the character). Otherwise return FALSE. |
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146 | * |
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147 | * Input parameters: pointer to location in which to return character |
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148 | * |
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149 | * Output parameters: character (if available) |
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150 | * |
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151 | * Return values: TRUE - character available |
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152 | * FALSE - no character available |
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153 | */ |
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154 | |
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155 | rtems_boolean is_character_ready( |
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156 | char *ch /* -> character */ |
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157 | ) |
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158 | { |
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159 | if (consoleRxBd->status & M360_BD_EMPTY) |
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160 | return FALSE; |
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161 | *ch = rxBuf; |
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162 | consoleRxBd->status = M360_BD_EMPTY | M360_BD_WRAP; |
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163 | return TRUE; |
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164 | } |
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165 | |
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166 | |
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167 | /* inbyte |
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168 | * |
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169 | * Receive a character from the console port |
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170 | * |
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171 | * Input parameters: NONE |
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172 | * |
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173 | * Output parameters: NONE |
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174 | * |
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175 | * Return values: character read |
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176 | */ |
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177 | |
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178 | char inbyte( void ) |
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179 | { |
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180 | char ch; |
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181 | |
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182 | while (is_character_ready (&ch) == FALSE) |
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183 | continue; |
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184 | return ch; |
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185 | } |
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186 | |
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187 | |
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188 | /* outbyte |
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189 | * |
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190 | * Transmit a character to the console serial port |
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191 | * |
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192 | * Input parameters: |
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193 | * ch - character to be transmitted |
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194 | * |
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195 | * Output parameters: NONE |
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196 | */ |
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197 | |
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198 | void outbyte( |
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199 | char ch |
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200 | ) |
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201 | { |
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202 | if (ch == '\n') |
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203 | outbyte('\r'); |
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204 | while (consoleTxBd->status & M360_BD_READY) |
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205 | continue; |
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206 | txBuf = ch; |
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207 | consoleTxBd->status = M360_BD_READY | M360_BD_WRAP; |
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208 | } |
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209 | |
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210 | /* |
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211 | * Open entry point |
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212 | */ |
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213 | |
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214 | rtems_device_driver console_open( |
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215 | rtems_device_major_number major, |
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216 | rtems_device_minor_number minor, |
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217 | void * arg |
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218 | ) |
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219 | { |
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220 | return RTEMS_SUCCESSFUL; |
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221 | } |
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222 | |
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223 | /* |
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224 | * Close entry point |
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225 | */ |
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226 | |
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227 | rtems_device_driver console_close( |
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228 | rtems_device_major_number major, |
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229 | rtems_device_minor_number minor, |
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230 | void * arg |
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231 | ) |
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232 | { |
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233 | return RTEMS_SUCCESSFUL; |
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234 | } |
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235 | |
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236 | /* |
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237 | * read bytes from the serial port. We only have stdin. |
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238 | */ |
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239 | |
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240 | rtems_device_driver console_read( |
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241 | rtems_device_major_number major, |
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242 | rtems_device_minor_number minor, |
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243 | void * arg |
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244 | ) |
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245 | { |
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246 | rtems_libio_rw_args_t *rw_args; |
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247 | char *buffer; |
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248 | int maximum; |
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249 | int count = 0; |
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250 | |
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251 | rw_args = (rtems_libio_rw_args_t *) arg; |
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252 | |
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253 | buffer = rw_args->buffer; |
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254 | maximum = rw_args->count; |
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255 | |
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256 | for (count = 0; count < maximum; count++) { |
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257 | buffer[ count ] = inbyte(); |
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258 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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259 | buffer[ count++ ] = '\n'; |
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260 | buffer[ count ] = 0; |
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261 | break; |
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262 | } |
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263 | } |
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264 | |
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265 | rw_args->bytes_moved = count; |
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266 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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267 | } |
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268 | |
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269 | /* |
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270 | * write bytes to the serial port. Stdout and stderr are the same. |
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271 | */ |
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272 | |
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273 | rtems_device_driver console_write( |
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274 | rtems_device_major_number major, |
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275 | rtems_device_minor_number minor, |
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276 | void * arg |
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277 | ) |
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278 | { |
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279 | int count; |
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280 | int maximum; |
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281 | rtems_libio_rw_args_t *rw_args; |
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282 | char *buffer; |
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283 | |
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284 | rw_args = (rtems_libio_rw_args_t *) arg; |
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285 | |
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286 | buffer = rw_args->buffer; |
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287 | maximum = rw_args->count; |
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288 | |
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289 | for (count = 0; count < maximum; count++) { |
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290 | if ( buffer[ count ] == '\n') { |
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291 | outbyte('\r'); |
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292 | } |
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293 | outbyte( buffer[ count ] ); |
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294 | } |
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295 | |
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296 | rw_args->bytes_moved = maximum; |
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297 | return 0; |
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298 | } |
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299 | |
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300 | /* |
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301 | * IO Control entry point |
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302 | */ |
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303 | |
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304 | rtems_device_driver console_control( |
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305 | rtems_device_major_number major, |
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306 | rtems_device_minor_number minor, |
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307 | void * arg |
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308 | ) |
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309 | { |
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310 | return RTEMS_SUCCESSFUL; |
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311 | } |
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