1 | /* |
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2 | * This file contains the efi68k console IO package. |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1997. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * Copyright assigned to U.S. Government, 1994. |
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7 | * |
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8 | * The license and distribution terms for this file may in |
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9 | * the file LICENSE in this distribution or at |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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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 | #include <stdlib.h> |
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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 | |
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20 | #define BAUD 38400 |
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21 | #define CLK_FREQ 8000000.0 |
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22 | |
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23 | /* BUFFER_LENGTH must be 2^n for n=1, 2, 3, .... */ |
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24 | #define BUFFER_LENGTH 256 |
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25 | #define RTS_STOP_SIZE BUFFER_LENGTH-64 |
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26 | #define RTS_START_SIZE 16 |
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27 | |
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28 | char xmt_buf[BUFFER_LENGTH]; |
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29 | char rcv_buf[BUFFER_LENGTH]; |
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30 | /* in: last entry into the buffer; always on a valid character */ |
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31 | /* out: points to the next character to be pull from the buffer */ |
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32 | /* in+1=out => buffer empty */ |
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33 | /* in+2=out => buffer full */ |
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34 | struct UART_buf { |
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35 | char *offset; |
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36 | char *in; |
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37 | char *out; |
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38 | }; |
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39 | static volatile struct UART_buf xmt = { xmt_buf, (char *)0, (char *)1}; |
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40 | static volatile struct UART_buf rcv = { rcv_buf, (char *)0, (char *)1}; |
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41 | static volatile char _debug_flag = 0; |
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42 | static volatile char _tx_stop = 0; |
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43 | |
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44 | /* _catchUARTint is the interrupt front-end */ |
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45 | extern void _catchUARTint(); |
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46 | asm(" .text |
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47 | .align 2 |
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48 | .globl _catchUARTint |
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49 | _catchUARTint: |
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50 | lea %sp@(4),%sp /* pop return address */ |
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51 | moveml %d0-%d7/%a0-%a6,%sp@- /* save registers */ |
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52 | jbsr uart_interrupt |
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53 | moveml %sp@+,%d0-%d7/%a0-%a6 |
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54 | rte |
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55 | "); |
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56 | |
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57 | /* _fake_trap_1 will continue the UART interrupt (%sr *still* |
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58 | UART_ISR_LEVEL) as a trap #1 to enter the debugger */ |
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59 | asm(" .text |
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60 | .align 2 |
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61 | _fake_trap_1: |
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62 | unlk %a6 /* clear interrupt frame */ |
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63 | lea %sp@(4),%sp /* remove jbsr instruction */ |
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64 | moveml %sp@+,%d0-%d7/%a0-%a6 /* pop registers */ |
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65 | jmp (33*6-12+_VBR) /* jump exception 1 */ |
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66 | "); |
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67 | |
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68 | /* dispatch UART interrupt */ |
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69 | void xmit_interrupt(void); |
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70 | void rcvr_interrupt(void); |
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71 | void modem_status(void); |
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72 | void _fake_trap_1(void); |
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73 | void uart_interrupt(void) { |
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74 | register char a; |
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75 | |
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76 | a=*IIR & (NIP | IID_MASK); /* read interrupt id register */ |
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77 | switch (a) { |
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78 | case 0x04: case 0x0c: |
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79 | rcvr_interrupt(); |
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80 | break; |
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81 | case 0x02: |
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82 | xmit_interrupt(); |
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83 | break; |
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84 | case 0x00: |
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85 | modem_status(); |
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86 | break; |
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87 | default: |
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88 | break; |
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89 | } |
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90 | if (_debug_flag) { |
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91 | _debug_flag = 0; /* reset the flag */ |
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92 | _fake_trap_1(); /* fake a trap #1 */ |
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93 | } |
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94 | } |
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95 | |
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96 | /* transfer received character to the buffer */ |
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97 | void rcvr_interrupt(void) { |
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98 | register char *a, c; |
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99 | register int length; |
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100 | |
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101 | while ( (*LSR & DR) != 0) { |
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102 | if ((c=*RBR) == 0x1a) /* use ctl-z to reboot */ |
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103 | reboot(); |
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104 | else if (c == 0x03) { /* use ctl-c to enter debugger */ |
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105 | _debug_flag = 1; |
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106 | continue; |
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107 | } |
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108 | *(char *)((int)rcv.offset +(int) |
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109 | (a=(char *)(((int)rcv.in+1) & ((int)BUFFER_LENGTH-1)))) = c; |
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110 | if ((char *)(((int)rcv.in+2) & ((int)BUFFER_LENGTH-1)) != rcv.out) |
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111 | rcv.in=a; |
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112 | } |
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113 | length = (BUFFER_LENGTH -1) & ( |
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114 | ( ((int)rcv.out <= (int)rcv.in) ? 0 : BUFFER_LENGTH) - (int)rcv.out |
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115 | + (int)rcv.in + 1); |
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116 | if (length >= RTS_STOP_SIZE) |
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117 | *MCR &= (char) (~RTS); |
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118 | } |
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119 | |
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120 | /* tranfer buffered characters to the UART */ |
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121 | void xmit_interrupt(void) { |
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122 | register short int i, oldsr; |
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123 | |
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124 | _CPU_ISR_Disable( oldsr ); /* for when outbyte calls */ |
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125 | if ( (*LSR & THRE) != 0 && _tx_stop == 0 ) |
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126 | for (i=0;i<16;i++) { |
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127 | if ((char *)(((int)xmt.in+1) & ((int)BUFFER_LENGTH-1))== xmt.out) |
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128 | break; |
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129 | *THR=*(char *)((int)xmt.offset+(int)xmt.out); |
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130 | xmt.out= (char *)(((int)xmt.out+1) & ((int)BUFFER_LENGTH-1)); |
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131 | } |
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132 | _CPU_ISR_Enable( oldsr ); |
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133 | } |
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134 | |
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135 | void modem_status(void) { |
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136 | register char a; |
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137 | |
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138 | if ( ((a=*MDSR) & DCTS) != 0 ) |
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139 | if ( (a & CTS) == 0) |
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140 | _tx_stop = 1; |
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141 | else { |
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142 | _tx_stop = 0; |
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143 | xmit_interrupt(); |
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144 | } |
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145 | } |
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146 | |
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147 | /* transfer character from the buffer */ |
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148 | char inbyte(void) { |
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149 | register char a; |
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150 | register int length; |
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151 | |
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152 | while ((char *)(((int)rcv.in+1) & ((int)BUFFER_LENGTH-1))== rcv.out); |
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153 | a=*(char *)((int)rcv.offset+(int)rcv.out); |
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154 | rcv.out= (char *)(((int)rcv.out+1) & ((int)BUFFER_LENGTH-1)); |
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155 | length = (BUFFER_LENGTH -1) & ( |
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156 | ( ((int)rcv.out <= (int)rcv.in) ? 0 : BUFFER_LENGTH) - (int)rcv.out |
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157 | + (int)rcv.in + 1); |
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158 | if (length < RTS_START_SIZE) |
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159 | *MCR |= (char) RTS; |
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160 | return (a); |
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161 | } |
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162 | |
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163 | /* once room is avaliable in the buffer, transfer |
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164 | the character into the buffer and enable |
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165 | the xmtr interrupt */ |
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166 | void outbyte(char c) { |
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167 | register char *a; |
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168 | |
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169 | while ((char *)(((int)xmt.in+2) & ((int)BUFFER_LENGTH-1)) == xmt.out); |
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170 | *(char *)((int)xmt.offset+(int) |
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171 | (a=(char *)(((int)xmt.in+1) & ((int)BUFFER_LENGTH-1))))=c; |
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172 | xmt.in=a; |
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173 | |
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174 | if ( (*LSR & THRE) != 0 ) /* if THRE, uart has already interrupted */ |
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175 | xmit_interrupt(); /* and was ignored. Need to restart. */ |
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176 | } |
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177 | |
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178 | void _UART_flush(void) { |
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179 | /* loop till xmt buffer empty. Works with interrupts disabled */ |
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180 | while ((char *)(((int)xmt.in+1) & ((int)BUFFER_LENGTH-1)) != xmt.out) |
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181 | xmit_interrupt(); |
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182 | /* loop till UART buffer empty */ |
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183 | while ( (*LSR & TEMT) == 0 ); |
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184 | } |
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185 | |
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186 | /* console_initialize |
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187 | * |
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188 | * This routine initializes the console IO driver. |
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189 | * |
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190 | * Input parameters: NONE |
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191 | * |
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192 | * Output parameters: NONE |
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193 | * |
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194 | * Return values: |
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195 | */ |
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196 | |
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197 | void console_init() |
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198 | { |
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199 | /* set clock divisor */ |
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200 | *LCR = (char)(DLAB); |
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201 | *DLL = (char)((int)(CLK_FREQ/BAUD/16.0+0.5) & 0xFF); |
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202 | *DLM = (char)(((int)(CLK_FREQ/BAUD/16.0+0.5) & 0xFF00) >> 8); |
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203 | |
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204 | /* Line control setup */ |
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205 | *LCR = (char)(WL_8 | NSB); |
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206 | |
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207 | /* Interrupt setup */ |
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208 | *IER = (char) 0x0b; /* enable transmit, receive, modem stat int */ |
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209 | |
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210 | /* FIFO setup */ |
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211 | *FCR = (char)(FIFO_E | 0xc0); |
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212 | |
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213 | /* Modem control setup */ |
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214 | *MCR = (char) RTS; |
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215 | |
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216 | /* init tx_stop with CTS */ |
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217 | _tx_stop = ( (*MDSR & CTS) ? 0 : 1); |
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218 | |
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219 | set_vector(_catchUARTint, UART_ISR_LEVEL+24, 0); |
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220 | } |
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221 | |
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222 | rtems_device_driver console_initialize( |
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223 | rtems_device_major_number major, |
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224 | rtems_device_minor_number minor, |
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225 | void *arg |
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226 | ) |
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227 | { |
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228 | rtems_status_code status; |
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229 | |
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230 | status = rtems_io_register_name( |
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231 | "/dev/console", |
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232 | major, |
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233 | (rtems_device_minor_number) 0 |
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234 | ); |
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235 | |
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236 | if (status != RTEMS_SUCCESSFUL) |
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237 | rtems_fatal_error_occurred(status); |
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238 | |
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239 | return RTEMS_SUCCESSFUL; |
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240 | |
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241 | } |
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242 | |
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243 | |
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244 | /* is_character_ready |
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245 | * |
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246 | * This routine returns TRUE if a character is available. |
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247 | * |
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248 | * Input parameters: NONE |
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249 | * |
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250 | * Output parameters: NONE |
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251 | * |
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252 | * Return values: |
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253 | */ |
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254 | |
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255 | rtems_boolean is_character_ready( |
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256 | char *ch |
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257 | ) |
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258 | { |
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259 | if ((char *)(((int)rcv.in+1) & ((int)BUFFER_LENGTH-1))== rcv.out) |
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260 | return(FALSE); |
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261 | else |
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262 | return(TRUE); |
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263 | } |
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264 | |
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265 | /* |
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266 | * Open entry point |
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267 | */ |
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268 | |
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269 | rtems_device_driver console_open( |
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270 | rtems_device_major_number major, |
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271 | rtems_device_minor_number minor, |
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272 | void * arg |
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273 | ) |
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274 | { |
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275 | return RTEMS_SUCCESSFUL; |
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276 | } |
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277 | |
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278 | /* |
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279 | * Close entry point |
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280 | */ |
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281 | |
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282 | rtems_device_driver console_close( |
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283 | rtems_device_major_number major, |
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284 | rtems_device_minor_number minor, |
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285 | void * arg |
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286 | ) |
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287 | { |
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288 | return RTEMS_SUCCESSFUL; |
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289 | } |
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290 | |
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291 | /* |
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292 | * read bytes from the serial port. We only have stdin. |
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293 | */ |
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294 | |
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295 | rtems_device_driver console_read( |
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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 | rtems_libio_rw_args_t *rw_args; |
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302 | char *buffer; |
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303 | int maximum; |
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304 | int count = 0; |
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305 | |
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306 | rw_args = (rtems_libio_rw_args_t *) arg; |
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307 | |
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308 | buffer = rw_args->buffer; |
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309 | maximum = rw_args->count; |
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310 | |
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311 | for (count = 0; count < maximum; count++) { |
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312 | buffer[ count ] = inbyte(); |
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313 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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314 | buffer[ count++ ] = '\n'; |
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315 | buffer[ count ] = 0; |
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316 | break; |
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317 | } |
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318 | } |
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319 | |
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320 | rw_args->bytes_moved = count; |
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321 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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322 | } |
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323 | |
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324 | /* |
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325 | * write bytes to the serial port. Stdout and stderr are the same. |
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326 | */ |
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327 | |
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328 | rtems_device_driver console_write( |
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329 | rtems_device_major_number major, |
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330 | rtems_device_minor_number minor, |
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331 | void * arg |
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332 | ) |
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333 | { |
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334 | int count; |
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335 | int maximum; |
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336 | rtems_libio_rw_args_t *rw_args; |
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337 | char *buffer; |
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338 | |
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339 | rw_args = (rtems_libio_rw_args_t *) arg; |
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340 | |
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341 | buffer = rw_args->buffer; |
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342 | maximum = rw_args->count; |
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343 | |
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344 | for (count = 0; count < maximum; count++) { |
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345 | if ( buffer[ count ] == '\n') { |
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346 | outbyte('\r'); |
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347 | } |
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348 | outbyte( buffer[ count ] ); |
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349 | } |
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350 | |
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351 | rw_args->bytes_moved = maximum; |
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352 | return 0; |
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353 | } |
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354 | |
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355 | /* |
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356 | * IO Control entry point |
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357 | */ |
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358 | |
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359 | rtems_device_driver console_control( |
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360 | rtems_device_major_number major, |
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361 | rtems_device_minor_number minor, |
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362 | void * arg |
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363 | ) |
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364 | { |
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365 | return RTEMS_SUCCESSFUL; |
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366 | } |
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