annotate testavr.c @ 23:845934a4e7fe

Add code to talk to a Phillips PDIUSBB12.
author darius
date Mon, 12 Dec 2005 23:32:59 +1030
parents 108a703c39e6
children 2b0ed085b95b
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1 /*
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2 * Test various AVR bits and pieces
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3 *
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4 * $Id$
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5 *
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6 * Copyright (c) 2004
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7 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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8 *
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions
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11 * are met:
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * 2. Redistributions in binary form must reproduce the above copyright
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15 * notice, this list of conditions and the following disclaimer in the
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16 * documentation and/or other materials provided with the distribution.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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21 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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28 * SUCH DAMAGE.
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29 */
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30
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31 #include <avr/io.h>
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32 #include <avr/interrupt.h>
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33 #include <avr/pgmspace.h>
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34 #include <string.h>
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35 #include <ctype.h>
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36 #include <stdlib.h>
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37
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38 #include "1wire.h"
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39
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40 #define UART_BAUD_SELECT(baudRate,xtalCpu) ((xtalCpu)/((baudRate)*16l)-1)
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41 #define UART_BAUD_RATE 19200
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42
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43 void uart_putsP(const char *addr);
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44 void uart_puts(const char *addr);
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45 int uart_putc(char c);
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46 int uart_getc(void);
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47 void uart_puts_dec(uint8_t a, uint8_t l);
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48 void uart_puts_hex(uint8_t a);
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49
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50 int
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51 main(void) {
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52 uint8_t ROM[8];
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53 char cmdbuf[40];
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54 int8_t i, arg;
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55 uint8_t crc, buf[9];;
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56 int8_t temp;
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57 uint16_t tfrac;
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58
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59 cli();
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60
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61 DDRC = 0xfc;
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62 PORTC = 0x00;
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63 DDRA = 0xff;
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64
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65 /* Init UART */
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66 UBRR = UART_BAUD_SELECT(UART_BAUD_RATE,XTAL_CPU);
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67
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68 /* Enable receiver and transmitter. Turn on transmit interrupts */
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69 UCR = _BV(RXEN) | _BV(TXEN);
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70
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71 uart_putsP(PSTR("\n\r\n\r===============\n\r"
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72 "Inited!\n\r\n\r"));
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73
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74 while (1) {
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75 uart_putsP(PSTR("> "));
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76 i = 0;
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77 while (1) {
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78 cmdbuf[i] = tolower(uart_getc());
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79 if (cmdbuf[i] == '\n' || cmdbuf[i] == '\r')
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80 break;
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81
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82 /* Backspace/Delete */
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83 if (cmdbuf[i] == 0x08) {
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84 if (i > 0) {
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85 uart_putsP(PSTR("\010\040\010"));
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86 i--;
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87 }
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88 continue;
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89 }
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90
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91 /* Anything unprintable just ignore it */
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92 if (!isprint(cmdbuf[i]))
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93 continue;
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94
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95 uart_putc(cmdbuf[i]);
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96 i++;
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97 if (i == sizeof(cmdbuf)) {
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98 uart_putsP(PSTR("\n\rLine too long"));
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99 i = 0;
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100 break;
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101 }
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102 }
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103 cmdbuf[i + 1] = '\0';
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104 uart_putsP(PSTR("\n\r"));
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105 if (i == 0)
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106 continue;
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107
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108 if (cmdbuf[0] == '?') {
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109 uart_putsP(PSTR("rs Reset and check for presence\n\r"
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110 "sr Search the bus for ROMs\n\r"
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111 "re Read a bit\n\r"
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112 "rb Read a byte\n\r"
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113 "wr bit Write a bit\n\r"
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114 "wb byte Write a byte (hex)\n\r"
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115 "wc cmd [ROMID] Write command\n\r"
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116 "te ROMID Read the temperature from a DS1820\n\r"
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117 "le byte Set the LED port\n\r"));
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118
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119 continue;
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120 }
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121
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122 if (i < 2)
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123 goto badcmd;
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124
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125 if (cmdbuf[0] == 'r' && cmdbuf[1] == 's') {
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126 uart_putsP(PSTR("Resetting... "));
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127
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128 if (OWTouchReset() == 1)
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129 uart_putsP(PSTR("No presence pulse found\n\r"));
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130 else
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131 uart_putsP(PSTR("Presence pulse found\n\r"));
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132 } else if (cmdbuf[0] == 'r' && cmdbuf[1] == 'e') {
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133 if (OWReadBit())
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134 uart_putsP(PSTR("Read a 1\n\r"));
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135 else
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136 uart_putsP(PSTR("Read a 0\n\r"));
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137 } else if (cmdbuf[0] == 'r' && cmdbuf[1] == 'b') {
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138 uart_putsP(PSTR("Read a 0x"));
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139 uart_puts_hex(OWReadByte());
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140 uart_putsP(PSTR("\n\r"));
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141 } else if (cmdbuf[0] == 'w' && cmdbuf[1] == 'r') {
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142 arg = strtol(cmdbuf + 3, (char **)NULL, 10);
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143 OWWriteBit(arg);
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144 uart_putsP(PSTR("Wrote a "));
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145 if (arg)
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146 uart_putsP(PSTR("1\n\r"));
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147 else
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148 uart_putsP(PSTR("0\n\r"));
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149 } else if (cmdbuf[0] == 'w' && cmdbuf[1] == 'b') {
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150 arg = (int)strtol(cmdbuf + 3, (char **)NULL, 16);
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151 OWWriteByte(arg);
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152 } else if (cmdbuf[0] == 'w' && cmdbuf[1] == 'c') {
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153 i = strlen(cmdbuf);
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154 if (i < 5) {
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155 uart_putsP(PSTR("No arguments\n\r"));
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156 continue;
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157 }
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158
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159 arg = (int)strtol(cmdbuf + 3, (char **)NULL, 16);
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160 if (arg == 0) {
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161 uart_putsP(PSTR("Unparseable command\n\r"));
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162 continue;
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163 }
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164
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165 if (i == 5) {
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166 OWSendCmd(NULL, arg);
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167 continue;
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168 }
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169
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170 if (i < 29) {
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171 uart_putsP(PSTR("Can't parse ROM ID\n\r"));
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172 continue;
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173 }
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174 for (i = 0; i < 8; i++)
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175 ROM[i] = (int)strtol(cmdbuf + 6 + (3 * i), (char **)NULL, 16);
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176
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177 OWSendCmd(ROM, arg);
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178 } else if (cmdbuf[0] == 't' && cmdbuf[1] == 'e') {
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179 if (strlen(cmdbuf) < 26) {
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180 uart_putsP(PSTR("Unable to parse ROM ID\n\r"));
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181 continue;
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182 }
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183
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184 for (i = 0; i < 8; i++)
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185 ROM[i] = (int)strtol(cmdbuf + 3 * (i + 1), (char **)NULL, 16);
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186
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187 if (ROM[0] != OW_FAMILY_TEMP) {
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188 uart_putsP(PSTR("ROM specified isn't a temperature sensor\n\r"));
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189 continue;
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190 }
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191
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192 OWSendCmd(ROM, OW_CONVERTT_CMD);
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193 i = 0;
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194 while (OWReadBit() == 0) {
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195 i++;
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196 }
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197 OWSendCmd(ROM, OW_RD_SCR_CMD);
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198 crc = 0;
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199 for (i = 0; i < 9; i++) {
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200 buf[i] = OWReadByte();
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201 if (i < 8)
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202 OWCRC(buf[i], &crc);
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203 }
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204
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205 if (crc != buf[8]) {
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206 uart_putsP(PSTR("CRC mismatch\n\r"));
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207 continue;
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208 }
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209
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210 #if 0
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211 uart_putsP(PSTR("temperature "));
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212 uart_puts_dec(temp >> 4, 0);
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213 uart_putsP(PSTR("."));
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214 uart_puts_dec((temp << 12) / 6553, 0);
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215 uart_putsP(PSTR("\n\r"));
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216 #else
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217 /* 0 Temperature LSB
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218 * 1 Temperature MSB
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219 * 2 Th
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220 * 3 Tl
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221 * 4 Reserved
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222 * 5 Reserved
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223 * 6 Count Remain
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224 * 7 Count per C
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225 * 8 CRC
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226 */
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227 #if 0
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228 for (i = 0; i < 9; i++) {
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229 uart_puts_dec(buf[i], 0);
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230 uart_putsP(PSTR("\n\r"));
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231 }
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232 #endif
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233 temp = buf[0];
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234 if (buf[0] & 0x01)
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235 temp -= 256;
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236 temp >>= 1;
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237
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238 tfrac = buf[7] - buf[6];
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239 tfrac *= (uint16_t)100;
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240 tfrac /= buf[7];
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241 tfrac += 75;
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242 if (tfrac < 100) {
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243 temp--;
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244 } else {
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245 tfrac -= 100;
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246 }
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247
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248 if (temp < 0){
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249 uart_putc('-');
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250 uart_puts_dec(-temp, 0);
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251 } else
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252 uart_puts_dec(temp, 0);
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253 uart_putsP(PSTR("."));
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254 uart_puts_dec(tfrac, 1);
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255 uart_putsP(PSTR("\n\r"));
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256
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257 #endif
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258 } else if (cmdbuf[0] == 's' && cmdbuf[1] == 'r') {
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259 memset(ROM, 0, 8);
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260
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261 i = OWFirst(ROM, 1, 0);
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262 do {
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263 switch (i) {
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264 case OW_BADWIRE:
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265 uart_putsP(PSTR("Presence pulse, but no module found, bad module/cabling?\n\r"));
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266 break;
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267
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268 case OW_NOPRESENCE:
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269 uart_putsP(PSTR("No presence pulse found\n\r"));
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270 break;
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271
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272 case OW_BADCRC:
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273 uart_putsP(PSTR("Bad CRC\n\r"));
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274 break;
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275
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276 case OW_NOMODULES:
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277 case OW_FOUND:
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278 break;
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279
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280 default:
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281 uart_putsP(PSTR("Unknown error from 1 wire library\n\r"));
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282 break;
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283 }
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284
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285 if (i != OW_FOUND)
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286 break;
13
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287
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288 for (i = 0; i < 7; i++) {
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289 uart_puts_hex(ROM[i]);
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290 uart_putc(':');
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291 }
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292 uart_puts_hex(ROM[7]);
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293 uart_putsP(PSTR("\n\r"));
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294
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295 i = OWNext(ROM, 1, 0);
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296 } while (1);
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297 } else if (cmdbuf[0] == 'l' && cmdbuf[1] == 'e') {
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298 crc = (uint8_t)strtol(cmdbuf + 3, (char **)NULL, 16);
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299 PORTA = crc;
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300 #if 1
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301 uart_putsP(PSTR("LEDs set to 0x"));
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302 uart_puts_hex(crc);
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303 uart_putsP(PSTR("\n\r"));
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304 #endif
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305 } else {
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306 badcmd:
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307 uart_putsP(PSTR("Unknown command, ? for a list\n\r"));
0
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308 }
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309
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310 }
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311
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312 return(0);
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313 }
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314
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315 int
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316 uart_putc(char c) {
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317 loop_until_bit_is_set(USR, UDRE);
17
a58b41b7d15c Covert to a later version of avr-libc. Stuff like not using inb/outb,
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318 UDR = c;
0
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319
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320 return(0);
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321 }
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322
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323 void
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324 uart_putsP(const char *addr) {
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325 char c;
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326
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327 while ((c = pgm_read_byte_near(addr++)))
0
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328 uart_putc(c);
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329 }
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330
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331 void
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332 uart_puts(const char *addr) {
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333 while (*addr)
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334 uart_putc(*addr++);
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335 }
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336
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diff changeset
337 void
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338 uart_puts_dec(uint8_t a, uint8_t l) {
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339 char s[4];
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340
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341 if (l && a < 10)
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342 uart_putsP(PSTR("0"));
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343 uart_puts(utoa(a, s, 10));
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344 }
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345
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346 void
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347 uart_puts_hex(uint8_t a) {
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348 char s[3];
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349
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350 if (a < 0x10)
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351 uart_putc('0');
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352
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353 uart_puts(utoa(a, s, 16));
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diff changeset
354 }
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355
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356 int
0
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357 uart_getc(void) {
17
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diff changeset
358 while (!USR & 0x80)
0
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359 ;
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360
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361 return (UDR);
0
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362 }
4
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363