Mercurial > ~darius > hgwebdir.cgi > avr-lib

annotate cons.c @ 3:15d89caaf516

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Add support for single UART devices, although untested apart from a compile. Doesn't break dual UART ones :) Also checks for PRR before setting it.
author darius@Inchoate
date Wed, 11 Mar 2009 17:28:39 +1030
parents 3879f487b661
children 095216e8453d
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1 /*
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2 * Console code for AVR board
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3 *
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4 * Copyright (c) 2008
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5 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 * SUCH DAMAGE.
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27 */
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28
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29 #include <ctype.h>
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30 #include <stdio.h>
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31 #include <stdint.h>
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32 #include <stdlib.h>
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33 #include <avr/interrupt.h>
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34 #include <avr/pgmspace.h>
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35 #include "cons.h"
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36
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37 #define UART_BAUD_SELECT(baudRate,xtalCpu) ((xtalCpu)/((baudRate)*16l)-1)
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38
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39 #ifdef UBRR0
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40 #define DUALUART
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41 #endif
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42
0
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43 /* Receive buffer storage */
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44 consbuf_t cmd;
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45
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46 /*
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47 * Stub to use with fdevopen
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48 *
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49 * We ignore f and always succeed
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50 */
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51 static int _putc(char c, FILE *f) {
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52 cons_putc(c);
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53 return(0);
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54 }
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55
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56 /*
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57 * Stub to use with fdevopen
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58 *
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59 * We ignore f and always succeed
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60 */
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61 static int _getc(FILE *f) {
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62 return(cons_getc());
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63 }
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64
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65 void
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66 cons_init(void) {
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67 #ifdef DUALUART
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68 UBRR0 = UART_BAUD_SELECT(38400, F_CPU);
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69
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70 /* Enable receiver and transmitter. Turn on rx interrupts */
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71 UCSR0A = 0;
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72 UCSR0B = _BV(RXEN0) | _BV(TXEN0) | _BV(RXCIE0);
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73 UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
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74 #else
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75 UBRRH = UART_BAUD_SELECT(38400, F_CPU) >> 8;
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76 UBRRL = (uint8_t)UART_BAUD_SELECT(38400, F_CPU);
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77
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78 /* Enable receiver and transmitter. Turn on rx interrupts */
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79 UCSRA = 0;
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80 UCSRB = _BV(RXEN) | _BV(TXEN) | _BV(RXCIE);
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81 UCSRC = _BV(URSEL) | _BV(UCSZ1) | _BV(UCSZ0);
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82 #endif
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83
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84 fdevopen(_putc, NULL); /* Open stdout */
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85 fdevopen(NULL, _getc); /* Open stdin */
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86 }
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87
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88 int
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89 cons_putc(char c) {
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90 #ifdef DUALUART
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91 loop_until_bit_is_set(UCSR0A, UDRE0);
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92 UDR0 = c;
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93 #else
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94 loop_until_bit_is_set(UCSRA, UDRE);
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95 UDR = c;
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96 #endif
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97
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98 return(0);
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99 }
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100
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101 void
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102 cons_putsP(const char *addr) {
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103 char c;
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104
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105 while ((c = pgm_read_byte_near(addr++)))
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106 cons_putc(c);
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107 }
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108
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109 void
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110 cons_puts(const char *addr) {
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111 while (*addr)
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112 cons_putc(*addr++);
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113 }
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114
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115 void
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116 cons_puts_dec(uint8_t a, uint8_t l) {
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117 char s[4];
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118
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119 if (l && a < 10)
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120 cons_putsP(PSTR("0"));
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121 cons_puts(utoa(a, s, 10));
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122 }
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123
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124 void
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125 cons_puts_hex(uint8_t a) {
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126 char s[3];
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127
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128 if (a < 0x10)
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129 cons_putc('0');
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130
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131 cons_puts(utoa(a, s, 16));
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132 }
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133
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134 char
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135 cons_getc(void) {
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136 #ifdef DUALUART
0
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137 while (!(UCSR0A & _BV(RXC0)))
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138 ;
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139 return (UDR0);
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140 #else
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141 while (!(UCSRA & _BV(RXC)))
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142 ;
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143 return (UDR);
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144 #endif
0
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145 }
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146
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147 /* Rx complete */
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148 #ifdef DUALUART
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149 ISR(USART0_RX_vect) {
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150 #else
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151 ISR(USART_RXC_vect) {
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152 #endif
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153 char c;
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154
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155 #ifdef DUALUART
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156 while (UCSR0A & _BV(RXC0)) {
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157 #else
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158 while (UCSRA & _BV(RXC)) {
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159 #endif
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160
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161 #ifdef DUALUART
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162 c = UDR0;
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163 #else
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164 c = UDR;
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165 #endif
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166 /* 255 means we're waiting for main to process the command,
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167 * just throw stuff away
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168 */
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169 if (cmd.state == 255)
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170 continue;
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171
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172 /* End of line? */
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173 if (c == '\n' || c == '\r') {
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174 cmd.buf[cmd.state] = '\0';
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175 printf_P(PSTR("\r\n"));
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176 cmd.len = cmd.state;
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177 cmd.state = 255;
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178 continue;
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179 }
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180
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181 /* Backspace/delete */
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182 if (c == 0x08 || c == 0x7f) {
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183 if (cmd.state > 0) {
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184 cmd.state--;
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185 printf_P(PSTR("\010\040\010"));
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186 }
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187 continue;
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188 }
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189
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190 /* Anything unprintable just ignore it */
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191 if (!isprint(c))
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192 continue;
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193
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194 cmd.buf[cmd.state] = tolower(c);
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195
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196 /* Echo back to the user */
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197 cons_putc(cmd.buf[cmd.state]);
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198
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199 cmd.state++;
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200 /* Over flow? */
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201 if (cmd.state == ((sizeof(cmd.buf) / sizeof(cmd.buf[0])) - 1)) {
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202 printf_P(PSTR("\r\nLine too long"));
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203 cmd.state = 0;
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204 continue;
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205 }
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206 }
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207 }
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208
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209 /* Tx complete */
3
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210 #ifdef DUALUART
0
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211 ISR(USART0_TX_vect) {
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212 #else
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213 ISR(USART_TXC_vect) {
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214 #endif
0
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215 }
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216