1 | /* |
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2 | * Initialize the MC68302 SCC2 for console IO board support package. |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #define GEN68302_INIT |
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15 | |
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16 | #include <bsp.h> |
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17 | #include <rtems/libio.h> |
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18 | |
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19 | #include <rtems/m68k/m68302.h> |
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20 | |
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21 | /* console_initialize |
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22 | * |
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23 | * This routine initializes the console IO driver. |
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24 | * |
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25 | * Input parameters: NONE |
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26 | * |
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27 | * Output parameters: NONE |
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28 | * |
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29 | * Return values: |
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30 | */ |
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31 | |
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32 | rtems_device_driver console_initialize( |
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33 | rtems_device_major_number major, |
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34 | rtems_device_minor_number minor, |
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35 | void *arg |
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36 | ) |
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37 | { |
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38 | rtems_status_code status; |
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39 | volatile m302_dualPortRAM_t *p = &m302; |
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40 | |
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41 | p->reg.pacnt |= 0x0003; /* enable RXD2 and TXD2 signals */ |
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42 | /* |
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43 | * TODO: Check assembly code. I think gcc's volatile semantics force |
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44 | * this to not use a CLR. |
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45 | */ |
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46 | p->reg.simode = 0; /* NMSI mode */ |
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47 | |
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48 | p->reg.scc[1].scon = 0x00d8; /* 9600 baud */ |
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49 | p->reg.scc[1].scm = 0x01b1; |
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50 | |
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51 | p->scc2.parm.rfcr = 0x50; /* Rx buffers in supervisor data */ |
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52 | p->scc2.parm.tfcr = 0x50; /* Tx buffers in supervisor data */ |
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53 | p->scc2.parm.mrblr = 0x0001; /* Max Rx buffer length is 1 byte */ |
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54 | |
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55 | p->scc2.prot.uart.max_idl = 0x0000; /* 0 = maximum timeout value */ |
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56 | p->scc2.prot.uart.brkcr = 0x0001; /* send 1 break char on STOP TX cmd */ |
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57 | p->scc2.prot.uart.parec = 0x0000; /* reset parity error counter */ |
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58 | p->scc2.prot.uart.frmec = 0x0000; /* reset framing error counter */ |
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59 | p->scc2.prot.uart.nosec = 0x0000; /* reset noise error counter */ |
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60 | p->scc2.prot.uart.brkec = 0x0000; /* reset break condition counter */ |
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61 | |
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62 | p->scc2.prot.uart.character[0] = 0x0003; /* use <ctrl>c as control char */ |
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63 | p->scc2.prot.uart.character[1] = 0x8000; /* set end of cntrl char table */ |
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64 | |
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65 | p->scc2.bd.rx[0].status = 0xA000; /* RxBD0 empty, wrap, no intr */ |
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66 | p->scc2.bd.rx[0].length = 0x0000; |
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67 | p->scc2.bd.rx[0].buffer = |
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68 | (uint8_t*) &m302.scc2.bd.rx[1]; /* RxBD1 is Rx buffer */ |
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69 | |
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70 | p->reg.scc[1].dsr = 0x7000; /* set full-length last stop bit */ |
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71 | |
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72 | p->scc2.bd.tx[0].status = 0x3000; /* TxBD0 not ready, wrap, intr */ |
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73 | p->scc2.bd.tx[0].length = 0x0001; |
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74 | p->scc2.bd.tx[0].buffer = |
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75 | (uint8_t*) &m302.scc2.bd.tx[1]; /* TxBD1 is Tx buffer */ |
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76 | |
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77 | p->reg.scc[1].scce = 0xFF; /* clear all SCC event flags */ |
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78 | p->reg.scc[1].sccm = 0x03; /* enable only Tx & Rx interrupts */ |
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79 | p->reg.scc[1].scm = 0x01BD; |
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80 | |
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81 | status = rtems_io_register_name( |
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82 | "/dev/console", |
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83 | major, |
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84 | (rtems_device_minor_number) 0 |
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85 | ); |
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86 | |
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87 | if (status != RTEMS_SUCCESSFUL) |
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88 | rtems_fatal_error_occurred(status); |
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89 | |
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90 | return RTEMS_SUCCESSFUL; |
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91 | |
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92 | } |
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93 | |
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94 | /* is_character_ready |
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95 | * |
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96 | * Check to see if a character is available on the MC68302's SCC2. If so, |
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97 | * then return a TRUE (along with the character). Otherwise return FALSE. |
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98 | * |
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99 | * Input parameters: pointer to location in which to return character |
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100 | * |
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101 | * Output parameters: character (if available) |
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102 | * |
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103 | * Return values: TRUE - character available |
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104 | * FALSE - no character available |
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105 | */ |
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106 | |
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107 | rtems_boolean is_character_ready( |
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108 | char *ch /* -> character */ |
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109 | ) |
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110 | { |
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111 | #define RXS (m302.scc2.bd.rx[0].status) |
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112 | #define RXD (* ((volatile char *) m302.scc2.bd.rx[0].buffer)) |
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113 | |
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114 | for (;;) { |
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115 | if (RXS & RBIT_HDLC_EMPTY_BIT) |
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116 | return FALSE; |
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117 | |
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118 | *ch = RXD; |
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119 | RXS = RBIT_HDLC_EMPTY_BIT | RBIT_HDLC_WRAP_BIT; |
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120 | if ( *ch >= ' ' && *ch <= '~' ) |
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121 | return TRUE; |
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122 | } |
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123 | } |
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124 | |
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125 | |
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126 | /* inbyte |
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127 | * |
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128 | * Receive a character from the MC68302's SCC2. |
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129 | * |
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130 | * Input parameters: NONE |
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131 | * |
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132 | * Output parameters: NONE |
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133 | * |
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134 | * Return values: character read |
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135 | */ |
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136 | |
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137 | char inbyte( void ) |
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138 | { |
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139 | char ch; |
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140 | |
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141 | #define RXS (m302.scc2.bd.rx[0].status) |
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142 | #define RXD (* ((volatile char *) m302.scc2.bd.rx[0].buffer)) |
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143 | |
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144 | do { |
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145 | while (RXS & RBIT_HDLC_EMPTY_BIT) |
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146 | /* Wait until character received */ ; |
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147 | |
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148 | ch = RXD; |
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149 | RXS = RBIT_HDLC_EMPTY_BIT | RBIT_HDLC_WRAP_BIT; |
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150 | |
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151 | if (ch == '\r' || ch == '\n') |
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152 | break; |
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153 | } while (ch < ' ' || ch > '~'); |
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154 | |
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155 | return ch; |
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156 | } |
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157 | |
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158 | |
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159 | /* outbyte |
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160 | * |
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161 | * Transmit a character out on the MC68302's SCC2. |
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162 | * It may support XON/XOFF flow control. |
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163 | * |
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164 | * Input parameters: |
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165 | * ch - character to be transmitted |
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166 | * |
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167 | * Output parameters: NONE |
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168 | */ |
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169 | |
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170 | void outbyte( |
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171 | char ch |
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172 | ) |
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173 | { |
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174 | #define TXS (m302.scc2.bd.tx[0].status) |
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175 | #define TXD (* ((volatile char *) m302.scc2.bd.tx[0].buffer)) |
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176 | |
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177 | #define RXS (m302.scc2.bd.rx[0].status) |
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178 | #define RXD (* ((volatile char *) m302.scc2.bd.rx[0].buffer)) |
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179 | |
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180 | while (TXS & RBIT_HDLC_READY_BIT) |
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181 | /* Wait until okay to transmit */ ; |
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182 | |
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183 | /* |
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184 | * Check for flow control requests and process. |
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185 | */ |
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186 | while ( ! (RXS & RBIT_HDLC_EMPTY_BIT)) { |
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187 | if (RXD == XOFF) |
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188 | do { |
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189 | RXS = RBIT_HDLC_EMPTY_BIT | RBIT_HDLC_WRAP_BIT; |
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190 | while (RXS & RBIT_HDLC_EMPTY_BIT) |
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191 | /* Wait until character received */ ; |
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192 | } while (RXD != XON); |
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193 | RXS = RBIT_HDLC_EMPTY_BIT | RBIT_HDLC_WRAP_BIT; |
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194 | } |
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195 | |
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196 | TXD = ch; |
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197 | TXS = RBIT_HDLC_READY_BIT | RBIT_HDLC_WRAP_BIT; |
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198 | if (ch == '\n') |
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199 | outbyte('\r'); |
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200 | } |
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201 | |
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202 | /* |
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203 | * Open entry point |
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204 | */ |
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205 | |
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206 | rtems_device_driver console_open( |
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207 | rtems_device_major_number major, |
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208 | rtems_device_minor_number minor, |
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209 | void * arg |
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210 | ) |
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211 | { |
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212 | return RTEMS_SUCCESSFUL; |
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213 | } |
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214 | |
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215 | /* |
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216 | * Close entry point |
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217 | */ |
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218 | |
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219 | rtems_device_driver console_close( |
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220 | rtems_device_major_number major, |
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221 | rtems_device_minor_number minor, |
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222 | void * arg |
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223 | ) |
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224 | { |
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225 | return RTEMS_SUCCESSFUL; |
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226 | } |
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227 | |
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228 | /* |
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229 | * read bytes from the serial port. We only have stdin. |
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230 | */ |
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231 | |
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232 | rtems_device_driver console_read( |
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233 | rtems_device_major_number major, |
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234 | rtems_device_minor_number minor, |
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235 | void * arg |
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236 | ) |
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237 | { |
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238 | rtems_libio_rw_args_t *rw_args; |
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239 | char *buffer; |
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240 | int maximum; |
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241 | int count = 0; |
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242 | |
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243 | rw_args = (rtems_libio_rw_args_t *) arg; |
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244 | |
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245 | buffer = rw_args->buffer; |
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246 | maximum = rw_args->count; |
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247 | |
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248 | for (count = 0; count < maximum; count++) { |
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249 | buffer[ count ] = inbyte(); |
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250 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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251 | buffer[ count++ ] = '\n'; |
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252 | break; |
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253 | } |
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254 | } |
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255 | |
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256 | rw_args->bytes_moved = count; |
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257 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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258 | } |
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259 | |
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260 | /* |
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261 | * write bytes to the serial port. Stdout and stderr are the same. |
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262 | */ |
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263 | |
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264 | rtems_device_driver console_write( |
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265 | rtems_device_major_number major, |
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266 | rtems_device_minor_number minor, |
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267 | void * arg |
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268 | ) |
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269 | { |
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270 | int count; |
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271 | int maximum; |
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272 | rtems_libio_rw_args_t *rw_args; |
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273 | char *buffer; |
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274 | |
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275 | rw_args = (rtems_libio_rw_args_t *) arg; |
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276 | |
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277 | buffer = rw_args->buffer; |
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278 | maximum = rw_args->count; |
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279 | |
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280 | for (count = 0; count < maximum; count++) { |
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281 | if ( buffer[ count ] == '\n') { |
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282 | outbyte('\r'); |
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283 | } |
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284 | outbyte( buffer[ count ] ); |
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285 | } |
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286 | |
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287 | rw_args->bytes_moved = maximum; |
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288 | return 0; |
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289 | } |
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290 | |
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291 | /* |
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292 | * IO Control entry point |
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293 | */ |
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294 | |
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295 | rtems_device_driver console_control( |
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296 | rtems_device_major_number major, |
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297 | rtems_device_minor_number minor, |
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298 | void * arg |
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299 | ) |
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300 | { |
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301 | return RTEMS_SUCCESSFUL; |
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302 | } |
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