annotate 1wire.c @ 15:0940abdf2b9d

- Add LED commands. - Fix backspace/delete.
author darius
date Sat, 17 Sep 2005 18:10:33 +0930
parents 4b141cc7cbd4
children 026dc24d85e0
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1 /*
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2 * Various 1 wire routines
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3 * Search routine is copied from the Dallas owpd library with mods
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4 * available from here http://www.ibutton.com/software/1wire/wirekit.html
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5 *
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6 * $Id$
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7 *
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8 * Copyright (c) 2004
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9 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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10 *
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11 * Redistribution and use in source and binary forms, with or without
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12 * modification, are permitted provided that the following conditions
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13 * are met:
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14 * 1. Redistributions of source code must retain the above copyright
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15 * notice, this list of conditions and the following disclaimer.
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16 * 2. Redistributions in binary form must reproduce the above copyright
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17 * notice, this list of conditions and the following disclaimer in the
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18 * documentation and/or other materials provided with the distribution.
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19 *
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20 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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23 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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30 * SUCH DAMAGE.
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31 */
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32
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33 #include <stdio.h>
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34 #include <avr/io.h>
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35 #include <avr/pgmspace.h>
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36
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37 #include "1wire.h"
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38 #include "1wire-delay.h"
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39
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40 #if OW_DEBUG
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41 void uart_putsP(const char *addr);
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42 void uart_puts(const char *addr);
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43 void uart_getc();
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44 int uart_putc(char c);
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45 #endif
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46
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47 static uint8_t OW_LastDevice = 0;
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48 static uint8_t OW_LastDiscrepancy = 0;
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49 static uint8_t OW_LastFamilyDiscrepancy = 0;
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50
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51 static void
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52 OWdelay(void) {
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53 DELAY_I;
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54 }
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55
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56 /*-----------------------------------------------------------------------------
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57 * Generate a 1-Wire reset, return 0 if presence pulse was found,
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58 * return 1 otherwise.
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59 * (NOTE: Does not handle alarm presence from DS2404/DS1994)
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60 */
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61 uint8_t
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62 OWTouchReset(void) {
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63 DELAY_G;
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64 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN));
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65 OWIREDDR |= _BV(OWIREOUTPIN);
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66 DELAY_H;
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67 OWIREDDR &= ~(_BV(OWIREOUTPIN));
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68 DELAY_I;
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69
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70 return(OWIREINPORT & _BV(OWIREINPIN) ? 1 : 0);
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71 }
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72
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73 /*-----------------------------------------------------------------------------
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74 * Send a 1-wire write bit.
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75 */
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76 void
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77 OWWriteBit(uint8_t bit) {
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78 OWdelay();
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79 if (bit) {
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80 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN));
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81 OWIREDDR |= _BV(OWIREOUTPIN);
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82 DELAY_A;
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83 OWIREDDR &= ~(_BV(OWIREOUTPIN));
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84 DELAY_B;
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85 } else {
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86 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN));
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87 OWIREDDR |= _BV(OWIREOUTPIN);
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88 DELAY_C;
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89 OWIREDDR &= ~(_BV(OWIREOUTPIN));
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90 DELAY_D;
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91 }
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92 }
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93
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94 /*-----------------------------------------------------------------------------
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95 * Read a bit from the 1-wire bus and return it.
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96 */
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97 uint8_t
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98 OWReadBit(void) {
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99 OWdelay();
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100
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101 OWIREOUTPORT &= ~(_BV(OWIREOUTPIN));
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102 OWIREDDR |= _BV(OWIREOUTPIN);
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103 DELAY_A;
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104 OWIREDDR &= ~(_BV(OWIREOUTPIN));
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105 DELAY_E;
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106 return(OWIREINPORT & _BV(OWIREINPIN) ? 1 : 0);
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107 }
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108
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109 /*-----------------------------------------------------------------------------
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110 * Write a byte to the 1-wire bus
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111 */
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112 void
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113 OWWriteByte(uint8_t data) {
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114 uint8_t i;
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115
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116 /* Send LSB first */
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117 for (i = 0; i < 8; i++) {
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118 OWWriteBit(data & 0x01);
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119 data >>= 1;
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120 }
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121 }
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122
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123 /*-----------------------------------------------------------------------------
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124 * Read a byte from the 1-wire bus
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125 */
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126 uint8_t
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127 OWReadByte(void) {
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128 int i, result = 0;
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129
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130 for (i = 0; i < 8; i++) {
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131 result >>= 1;
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132 if (OWReadBit())
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133 result |= 0x80;
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134 }
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135 return(result);
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136 }
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137
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138 /*-----------------------------------------------------------------------------
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139 * Write a 1-wire data byte and return the sampled result.
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140 */
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141 uint8_t
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142 OWTouchByte(uint8_t data) {
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143 uint8_t i, result = 0;
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144
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145 for (i = 0; i < 8; i++) {
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146 result >>= 1;
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147
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148 /* If sending a 1 then read a bit, otherwise write a 0 */
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149 if (data & 0x01) {
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150 if (OWReadBit())
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151 result |= 0x80;
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152 } else
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153 OWWriteBit(0);
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154
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155 data >>= 1;
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156 }
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157
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158 return(result);
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159 }
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160
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161 /*-----------------------------------------------------------------------------
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162 * Write a block of bytes to the 1-wire bus and return the sampled result in
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163 * the same buffer
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164 */
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165 void
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166 OWBlock(uint8_t *data, int len) {
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167 int i;
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168
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169 for (i = 0; i < len; i++)
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170 data[i] = OWTouchByte(data[i]);
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171 }
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172
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173
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174 /*-----------------------------------------------------------------------------
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175 * Send a 1 wire command to a device, or all if no ROM ID provided
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176 */
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177 void
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178 OWSendCmd(uint8_t *ROM, uint8_t cmd) {
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179 uint8_t i;
0
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180
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181 OWTouchReset();
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182
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183 if (ROM == NULL)
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184 OWWriteByte(OW_SKIP_ROM_CMD);
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185 else {
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186 OWWriteByte(OW_MATCH_ROM_CMD);
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187 for (i = 0; i < 8; i++)
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188 OWWriteByte(ROM[i]);
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189 }
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190
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191 OWWriteByte(cmd);
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192 }
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193
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194 /*-----------------------------------------------------------------------------
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195 * Search algorithm from App note 187 (and 162)
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196 *
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197 * OWFirst/OWNext return..
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198 * 1 when something is found,
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199 * 0 no more modules
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200 * -1 if no presense pulse,
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201 * -2 if bad CRC,
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202 * -3 if bad wiring.
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203 */
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204 uint8_t
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205 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
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206 /* Reset state */
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207 OW_LastDiscrepancy = 0;
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208 OW_LastDevice = 0;
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209 OW_LastFamilyDiscrepancy = 0;
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210
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211 /* Go looking */
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212 return (OWNext(ROM, do_reset, alarm_only));
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213 }
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214
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215 /* Returns 1 when something is found, 0 if nothing left */
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216 uint8_t
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217 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
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218 uint8_t bit_test, search_direction, bit_number;
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219 uint8_t last_zero, rom_byte_number, rom_byte_mask;
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220 uint8_t lastcrc8, crcaccum;
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221 int8_t next_result;
0
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222
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223 /* Init for search */
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224 bit_number = 1;
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225 last_zero = 0;
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226 rom_byte_number = 0;
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227 rom_byte_mask = 1;
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228 next_result = OW_NOMODULES;
0
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229 lastcrc8 = 0;
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230 crcaccum = 0;
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231
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232 /* if the last call was not the last one */
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233 if (!OW_LastDevice) {
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234 /* check if reset first is requested */
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235 if (do_reset) {
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236 /* reset the 1-wire
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237 * if there are no parts on 1-wire, return 0 */
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238 #if OW_DEBUG
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239 uart_putsP(PSTR("Resetting\n\r"));
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240 #endif
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241 if (OWTouchReset()) {
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242 /* reset the search */
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243 OW_LastDiscrepancy = 0;
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244 OW_LastFamilyDiscrepancy = 0;
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245 #if OW_DEBUG
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246 uart_putsP(PSTR("No devices on bus\n\r"));
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247 #endif
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248 return OW_NOPRESENCE;
0
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249 }
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250 }
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251
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252 /* If finding alarming devices issue a different command */
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253 if (alarm_only)
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254 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */
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255 else
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256 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */
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257
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258 /* pause before beginning the search */
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259 OWdelay();
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260 OWdelay();
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261 OWdelay();
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262
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263 /* loop to do the search */
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264 do {
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265 /* read a bit and its compliment */
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266 bit_test = OWReadBit() << 1;
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267 bit_test |= OWReadBit();
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268
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269 #if OW_DEBUG
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270 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
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271 uart_puts(errstr);
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272 #endif
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273
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274 /* check for no devices on 1-wire */
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275 if (bit_test == 3) {
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276 #if OW_DEBUG
0
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277 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
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278 uart_puts(errstr);
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279 #endif
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280 return(OW_BADWIRE);
0
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281 }
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282 else {
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283 /* all devices coupled have 0 or 1 */
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284 if (bit_test > 0)
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285 search_direction = !(bit_test & 0x01); /* bit write value for search */
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286 else {
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287 /* if this discrepancy is before the Last Discrepancy
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288 * on a previous OWNext then pick the same as last time */
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289 if (bit_number < OW_LastDiscrepancy)
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290 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0);
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291 else
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292 /* if equal to last pick 1, if not then pick 0 */
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293 search_direction = (bit_number == OW_LastDiscrepancy);
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294
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295 /* if 0 was picked then record its position in LastZero */
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296 if (search_direction == 0) {
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297 last_zero = bit_number;
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298
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299 /* check for Last discrepancy in family */
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300 if (last_zero < 9)
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301 OW_LastFamilyDiscrepancy = last_zero;
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302 }
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303 }
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304
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305 /* set or clear the bit in the ROM byte rom_byte_number
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306 * with mask rom_byte_mask */
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307 if (search_direction == 1)
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308 ROM[rom_byte_number] |= rom_byte_mask;
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309 else
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310 ROM[rom_byte_number] &= ~rom_byte_mask;
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311
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312 /* serial number search direction write bit */
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313 OWWriteBit(search_direction);
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314
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315 /* increment the byte counter bit_number
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316 * and shift the mask rom_byte_mask */
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317 bit_number++;
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318 rom_byte_mask <<= 1;
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319
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320 /* if the mask is 0 then go to new ROM byte rom_byte_number
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321 * and reset mask */
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322 if (rom_byte_mask == 0) {
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323 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */
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324 lastcrc8 = crcaccum;
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325
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326 rom_byte_number++;
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327 rom_byte_mask = 1;
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328 }
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329 }
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330 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */
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331
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332 /* if the search was successful then */
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333 if (!(bit_number < 65) || lastcrc8) {
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334 if (lastcrc8) {
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335 #if OW_DEBUG
0
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336 sprintf_P(errstr, PSTR("Bad CRC (%d)\n\r"), lastcrc8);
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337 uart_puts(errstr);
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338 #endif
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339 next_result = OW_BADCRC;
0
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340 } else {
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341 /* search successful so set LastDiscrepancy,LastDevice,next_result */
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342 OW_LastDiscrepancy = last_zero;
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343 OW_LastDevice = (OW_LastDiscrepancy == 0);
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344 #if OW_DEBUG
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345 sprintf_P(errstr, PSTR("Last device = %d\n\r"), OW_LastDevice);
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346 uart_puts(errstr);
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347 #endif
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348 next_result = OW_FOUND;
0
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349 }
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350 }
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351 }
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352
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353 /* if no device found then reset counters so next 'next' will be
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354 * like a first */
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355 if (next_result != OW_FOUND || ROM[0] == 0) {
0
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356 OW_LastDiscrepancy = 0;
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357 OW_LastDevice = 0;
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358 OW_LastFamilyDiscrepancy = 0;
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359 }
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360
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361 if (next_result == OW_FOUND && ROM[0] == 0x00)
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362 next_result = OW_BADWIRE;
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363
0
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364 return next_result;
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365
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366 }
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367
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368 uint8_t PROGMEM dscrc_table[] = {
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369 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
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370 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
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371 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
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372 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
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373 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
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374 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
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375 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
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376 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
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377 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205,
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378 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80,
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379 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238,
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380 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
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381 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
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382 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
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383 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
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384 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
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385 };
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386
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387 void
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388 OWCRC(uint8_t x, uint8_t *crc) {
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389 *crc = pgm_read_byte(&dscrc_table[(*crc) ^ x]);
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390 }