annotate 1wire.c @ 34:2b8278ec5adb

Work around FreeBSD setting CPU flags based on architectures (-march=pentium-m doesn't work so well on AVR)
author darius
date Tue, 23 Oct 2007 10:52:50 +0930
parents 0aa6bf4b98ae
children 5898fba6593c
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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 /*
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34 * No user servicable parts inside
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35 *
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36 * Modify 1wire-config.h
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37 */
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38
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39 #include <stdio.h>
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40 #include <avr/io.h>
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41 #include <avr/pgmspace.h>
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42 #include <util/delay.h>
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43 #include "1wire.h"
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44 #include "1wire-config.h"
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45
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46 static uint8_t OW_LastDevice = 0;
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47 static uint8_t OW_LastDiscrepancy = 0;
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48 static uint8_t OW_LastFamilyDiscrepancy = 0;
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49
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50 /*-----------------------------------------------------------------------------
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51 * Configure the IO port as we need
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52 */
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53 void
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54 OWInit(void) {
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55 OWBUSINIT();
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56 OWSETBUSHIGH();
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57 }
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58
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59 /*-----------------------------------------------------------------------------
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bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
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60 * Generate a 1-Wire reset, return 0 if presence pulse was found, 1 if it
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61 * wasn't, or 2 if the line appears to be being held low.
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62 *
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63 * (NOTE: Does not handle alarm presence from DS2404/DS1994)
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64 */
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65 uint8_t
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66 OWTouchReset(void) {
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67 OWDELAY_G;
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68
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69 /* Check the bus isn't being held low (ie it's broken) Do it after
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70 * the delay so we guarantee we don't see a slave from a previous
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71 * comms attempt
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72 */
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73 if(OWREADBUS() == 0)
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74 return 2;
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75
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76 OWSETBUSLOW();
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77 OWDELAY_H;
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78 OWSETBUSHIGH();
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79 OWDELAY_I;
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80
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81 return(OWREADBUS());
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82 }
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83
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84 /*-----------------------------------------------------------------------------
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85 * Send a 1-wire write bit.
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86 */
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87 void
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88 OWWriteBit(uint8_t bit) {
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89 OWDELAY_I;
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90
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91 if (bit) {
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92 OWSETBUSLOW();
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93 OWDELAY_A;
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94 OWSETBUSHIGH();
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95 OWDELAY_B;
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96 } else {
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97 OWSETBUSLOW();
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98 OWDELAY_C;
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99 OWSETBUSHIGH();
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100 OWDELAY_D;
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101 }
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102 }
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103
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104 /*-----------------------------------------------------------------------------
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105 * Read a bit from the 1-wire bus and return it.
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106 */
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107 uint8_t
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108 OWReadBit(void) {
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109 OWDELAY_I;
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110
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111 OWSETBUSLOW();
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112 OWDELAY_A;
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113 OWSETBUSHIGH();
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114 OWDELAY_E;
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115 return(OWREADBUS());
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116 }
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117
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118 /*-----------------------------------------------------------------------------
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119 * Write a byte to the 1-wire bus
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120 */
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121 void
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122 OWWriteByte(uint8_t data) {
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123 uint8_t i;
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124
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125 /* Send LSB first */
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126 for (i = 0; i < 8; i++) {
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127 OWWriteBit(data & 0x01);
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128 data >>= 1;
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129 }
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130 }
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131
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132 /*-----------------------------------------------------------------------------
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133 * Read a byte from the 1-wire bus
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134 */
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135 uint8_t
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136 OWReadByte(void) {
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137 int i, result = 0;
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138
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139 for (i = 0; i < 8; i++) {
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140 result >>= 1;
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141 if (OWReadBit())
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142 result |= 0x80;
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143 }
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144 return(result);
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145 }
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146
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147 /*-----------------------------------------------------------------------------
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148 * Write a 1-wire data byte and return the sampled result.
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149 */
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150 uint8_t
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151 OWTouchByte(uint8_t data) {
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152 uint8_t i, result = 0;
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153
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154 for (i = 0; i < 8; i++) {
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155 result >>= 1;
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156
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157 /* If sending a 1 then read a bit, otherwise write a 0 */
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158 if (data & 0x01) {
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159 if (OWReadBit())
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160 result |= 0x80;
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161 } else
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162 OWWriteBit(0);
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163
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164 data >>= 1;
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165 }
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166
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167 return(result);
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168 }
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169
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170 /*-----------------------------------------------------------------------------
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171 * Write a block of bytes to the 1-wire bus and return the sampled result in
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172 * the same buffer
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173 */
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174 void
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175 OWBlock(uint8_t *data, int len) {
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176 int i;
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177
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178 for (i = 0; i < len; i++)
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179 data[i] = OWTouchByte(data[i]);
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180 }
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181
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182
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183 /*-----------------------------------------------------------------------------
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184 * Send a 1 wire command to a device, or all if no ROM ID provided
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185 */
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186 void
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187 OWSendCmd(uint8_t *ROM, uint8_t cmd) {
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188 uint8_t i;
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189
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190 OWTouchReset();
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191
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192 if (ROM == NULL)
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193 OWWriteByte(OW_SKIP_ROM_CMD);
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194 else {
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195 OWWriteByte(OW_MATCH_ROM_CMD);
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196 for (i = 0; i < 8; i++)
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197 OWWriteByte(ROM[i]);
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198 }
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199 OWWriteByte(cmd);
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200 }
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201
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202 /*-----------------------------------------------------------------------------
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203 * Search algorithm from App note 187 (and 162)
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204 *
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205 * OWFirst/OWNext return..
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206 * 1 when something is found,
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207 * 0 no more modules
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208 * -1 if no presence pulse,
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209 * -2 if bad CRC,
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210 * -3 if bad wiring.
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211 */
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212 uint8_t
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213 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
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214 /* Reset state */
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215 OW_LastDiscrepancy = 0;
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216 OW_LastDevice = 0;
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217 OW_LastFamilyDiscrepancy = 0;
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218
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219 /* Go looking */
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220 return (OWNext(ROM, do_reset, alarm_only));
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221 }
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222
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223 /* Returns 1 when something is found, 0 if nothing left */
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224 uint8_t
0
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225 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
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226 uint8_t bit_test, search_direction, bit_number;
10
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227 uint8_t last_zero, rom_byte_number, rom_byte_mask;
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228 uint8_t lastcrc8, crcaccum;
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229 int8_t next_result;
0
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230
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231 /* Init for search */
21
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232 bit_number = 1;
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233 last_zero = 0;
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234 rom_byte_number = 0;
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235 rom_byte_mask = 1;
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236 next_result = OW_NOMODULES;
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237 lastcrc8 = 0;
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238 crcaccum = 0;
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239
21
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240 /* if the last call was not the last one */
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241 if (!OW_LastDevice) {
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242 /* check if reset first is requested */
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243 if (do_reset) {
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244 /* reset the 1-wire
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245 * if there are no parts on 1-wire, return 0 */
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246 OWPUTSP(PSTR("Resetting\n\r"));
22
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247 switch (OWTouchReset()) {
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248 case 0:
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249 break;
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250
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
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251 case 1:
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252 /* reset the search */
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253 OW_LastDiscrepancy = 0;
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254 OW_LastFamilyDiscrepancy = 0;
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255 OWPUTSP(PSTR("No devices on bus\n\r"));
22
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256 return OW_NOPRESENCE;
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257 break;
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258
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next.
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259 case 2:
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260 /* reset the search */
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261 OW_LastDiscrepancy = 0;
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262 OW_LastFamilyDiscrepancy = 0;
33
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263 OWPUTSP(PSTR("Bus appears to be being held low\n\r"));
22
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264 return OW_BADWIRE;
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265 break;
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266
21
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267 }
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268 }
0
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269
21
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270 /* If finding alarming devices issue a different command */
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271 if (alarm_only)
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272 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */
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273 else
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274 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */
0
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275
21
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276 /* pause before beginning the search */
32
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header.
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277 OWDELAY_I;
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278 OWDELAY_I;
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279 OWDELAY_I;
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280
21
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281 /* loop to do the search */
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282 do {
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283 /* read a bit and its compliment */
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284 bit_test = OWReadBit() << 1;
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285 bit_test |= OWReadBit();
0
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286
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287 #if OW_DEBUG
21
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288 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
33
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289 OWPUTSP(errstr);
0
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290 #endif
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291
21
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292 /* check for no devices on 1-wire */
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293 if (bit_test == 3) {
10
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parents: 8
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294 #if OW_DEBUG
21
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295 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
33
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296 OWPUTSP(errstr);
10
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297 #endif
21
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298 return(OW_BADWIRE);
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299 }
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300 else {
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301 /* all devices coupled have 0 or 1 */
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302 if (bit_test > 0)
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303 search_direction = !(bit_test & 0x01); /* bit write value for search */
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parents: 16
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304 else {
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diff changeset
305 /* if this discrepancy is before the Last Discrepancy
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parents: 16
diff changeset
306 * on a previous OWNext then pick the same as last time */
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307 if (bit_number < OW_LastDiscrepancy)
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308 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0);
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309 else
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diff changeset
310 /* if equal to last pick 1, if not then pick 0 */
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311 search_direction = (bit_number == OW_LastDiscrepancy);
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312
21
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313 /* if 0 was picked then record its position in LastZero */
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314 if (search_direction == 0) {
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315 last_zero = bit_number;
0
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316
21
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317 /* check for Last discrepancy in family */
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318 if (last_zero < 9)
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319 OW_LastFamilyDiscrepancy = last_zero;
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320 }
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321 }
0
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322
21
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323 /* set or clear the bit in the ROM byte rom_byte_number
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324 * with mask rom_byte_mask */
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325 if (search_direction == 1)
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326 ROM[rom_byte_number] |= rom_byte_mask;
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diff changeset
327 else
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328 ROM[rom_byte_number] &= ~rom_byte_mask;
0
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329
21
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330 /* serial number search direction write bit */
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331 OWWriteBit(search_direction);
0
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332
21
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diff changeset
333 /* increment the byte counter bit_number
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parents: 16
diff changeset
334 * and shift the mask rom_byte_mask */
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parents: 16
diff changeset
335 bit_number++;
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diff changeset
336 rom_byte_mask <<= 1;
0
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337
21
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diff changeset
338 /* if the mask is 0 then go to new ROM byte rom_byte_number
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parents: 16
diff changeset
339 * and reset mask */
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parents: 16
diff changeset
340 if (rom_byte_mask == 0) {
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341 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */
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diff changeset
342 lastcrc8 = crcaccum;
0
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parents:
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343
21
e82d15fa9a1a Re-format the code.
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diff changeset
344 rom_byte_number++;
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diff changeset
345 rom_byte_mask = 1;
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
346 }
e82d15fa9a1a Re-format the code.
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diff changeset
347 }
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348 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */
0
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349
21
e82d15fa9a1a Re-format the code.
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diff changeset
350 /* if the search was successful then */
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parents: 16
diff changeset
351 if (!(bit_number < 65) || lastcrc8) {
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
352 if (lastcrc8) {
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
353 #if OW_DEBUG
21
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
354 sprintf_P(errstr, PSTR("Bad CRC (%d)\n\r"), lastcrc8);
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
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parents: 32
diff changeset
355 OWPUTSP(errstr);
12
4b141cc7cbd4 - Reduce type widths where possible.
darius
parents: 10
diff changeset
356 #endif
21
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
357 next_result = OW_BADCRC;
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
358 } else {
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
359 /* search successful so set LastDiscrepancy,LastDevice,next_result */
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
360 OW_LastDiscrepancy = last_zero;
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
361 OW_LastDevice = (OW_LastDiscrepancy == 0);
0
ffeab3c04e83 Initial revision
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parents:
diff changeset
362 #if OW_DEBUG
21
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
363 sprintf_P(errstr, PSTR("Last device = %d\n\r"), OW_LastDevice);
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
364 OWPUTSP(errstr);
0
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parents:
diff changeset
365 #endif
21
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
366 next_result = OW_FOUND;
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
367 }
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
368 }
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
369 }
0
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parents:
diff changeset
370
21
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
371 /* if no device found then reset counters so next 'next' will be
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
372 * like a first */
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
373 if (next_result != OW_FOUND || ROM[0] == 0) {
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darius
parents: 16
diff changeset
374 OW_LastDiscrepancy = 0;
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darius
parents: 16
diff changeset
375 OW_LastDevice = 0;
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darius
parents: 16
diff changeset
376 OW_LastFamilyDiscrepancy = 0;
e82d15fa9a1a Re-format the code.
darius
parents: 16
diff changeset
377 }
0
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parents:
diff changeset
378
21
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
379 if (next_result == OW_FOUND && ROM[0] == 0x00)
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parents: 16
diff changeset
380 next_result = OW_BADWIRE;
10
eb1faf51968e - Add some useful return values to search functions.
darius
parents: 8
diff changeset
381
21
e82d15fa9a1a Re-format the code.
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parents: 16
diff changeset
382 return next_result;
0
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parents:
diff changeset
383
ffeab3c04e83 Initial revision
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parents:
diff changeset
384 }
ffeab3c04e83 Initial revision
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parents:
diff changeset
385
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parents:
diff changeset
386 uint8_t PROGMEM dscrc_table[] = {
ffeab3c04e83 Initial revision
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parents:
diff changeset
387 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
ffeab3c04e83 Initial revision
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parents:
diff changeset
388 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
ffeab3c04e83 Initial revision
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parents:
diff changeset
389 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
ffeab3c04e83 Initial revision
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parents:
diff changeset
390 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
ffeab3c04e83 Initial revision
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parents:
diff changeset
391 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
ffeab3c04e83 Initial revision
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parents:
diff changeset
392 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
ffeab3c04e83 Initial revision
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parents:
diff changeset
393 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
ffeab3c04e83 Initial revision
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parents:
diff changeset
394 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
395 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205,
ffeab3c04e83 Initial revision
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parents:
diff changeset
396 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80,
ffeab3c04e83 Initial revision
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parents:
diff changeset
397 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238,
ffeab3c04e83 Initial revision
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parents:
diff changeset
398 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
ffeab3c04e83 Initial revision
darius
parents:
diff changeset
399 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
ffeab3c04e83 Initial revision
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parents:
diff changeset
400 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
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401 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
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402 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
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403 };
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404
33
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405 /*-----------------------------------------------------------------------------
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406 * Update *crc based on the value of x
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407 */
0
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408 void
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409 OWCRC(uint8_t x, uint8_t *crc) {
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410 *crc = pgm_read_byte(&dscrc_table[(*crc) ^ x]);
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411 }
33
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412
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413 /*-----------------------------------------------------------------------------
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414 * Program a DS2502's memory
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415 *
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416 * Arguments
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417 * ROM - ROM ID (or NULL to send SKIP_ROM)
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418 * start - Start address (bytes)
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419 * len - Length of data to write
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420 * data - Data to write
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421 * exact - If true, only accept exact matches for programming,
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422 * otherwise only ensure the bits we requested were
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423 * programmed [to 0]
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424 * status - If true program status rather than memory
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425 *
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426 * Returns..
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427 * 0 if all is OK
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428 * 1 if the programming was unsuccessful
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429 * 2 if the parameters were invalid
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430 * 3 if the DS2502 didn't respond appropriately (also happens if the
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431 * module doesn't exist)
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432 */
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433 uint8_t
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434 OWProgROM(uint8_t *ROM, uint8_t start, uint8_t len, uint8_t *data, uint8_t exact, uint8_t status) {
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435 #if defined(OWSETVPPON) && defined(OWSETVPPOFF)
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436 uint8_t crc, i, tmp;
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437
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438 /* Stupid programmer detection */
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439 if (status) {
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440 if (start + len > 3)
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441 return(2);
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442 } else {
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443 if (start + len > 127)
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444 return(2);
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445 }
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446
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447 if (len < 1)
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448 return(2);
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449
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450 OWDELAY_I;
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451 if (OWTouchReset() != 0) {
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452 uart_putsP(PSTR("No presence pulse\n\r"));
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453 return(3);
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454 }
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455
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456 crc = 0;
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457
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458 /* Send the command */
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459 if (status) {
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460 OWSendCmd(ROM, OW_WRITE_STATUS);
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461 OWCRC(OW_WRITE_STATUS, &crc);
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462 } else {
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463 OWSendCmd(ROM, OW_WRITE_MEMORY);
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464 OWCRC(OW_WRITE_MEMORY, &crc);
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465 }
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466
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467 /* And the start address
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468 * (2 bytes even though one would do)
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469 */
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470 OWWriteByte(start);
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471 OWCRC(start, &crc);
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472
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473 OWWriteByte(0x00);
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474 OWCRC(0x00, &crc);
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475
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476 for (i = 0; i < len; i++) {
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477 uart_putsP(PSTR("Programming "));
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478 uart_puts_hex(data[i]);
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479 uart_putsP(PSTR(" to "));
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480 uart_puts_hex(start + i);
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481 uart_putsP(PSTR("\n\r"));
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482
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483 OWWriteByte(data[i]);
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484 OWCRC(data[i], &crc);
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485
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486 tmp = OWReadByte();
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487
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488 if (crc != tmp) {
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489 uart_putsP(PSTR("CRC mismatch "));
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490 uart_puts_hex(crc);
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491 uart_putsP(PSTR(" vs "));
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492 uart_puts_hex(tmp);
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493 uart_putsP(PSTR("\n\r"));
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494
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495 OWTouchReset();
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496 return(3);
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497 }
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498
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499 OWSETVPPON();
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500 OWDELAY_H;
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501 OWSETVPPOFF();
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502
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503 tmp = OWReadByte();
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504
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505 /* Check the bits we turned off are off */
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506 /*
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507 for (i = 0; i < 8; i++)
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508 if (!(data[i] & 1 << i) && (tmp & 1 << i))
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509 return(-3);
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510 */
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511 if ((!data[i] & tmp) != 0) {
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512 uart_putsP(PSTR("Readback mismatch "));
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513 uart_puts_hex(data[i]);
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514 uart_putsP(PSTR(" vs "));
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515 uart_puts_hex(data[i]);
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516 uart_putsP(PSTR("\n\r"));
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517
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518 OWTouchReset();
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519 return(3);
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520 }
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521
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522 /* The DS2502 loads it's CRC register with the address of the
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523 * next byte */
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524 crc = 0;
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525 OWCRC(start + i + 1, &crc);
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526 }
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527
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528 return(0);
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529 #else
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530 return(1);
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531 #endif
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532 }
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533