annotate 1wire.c @ 43:51e7458d2e76

Init lastdata same as lastheat/coolon/off otherwise we won't handle thing properly early on (ie if now < lastdata/lastheat/coolon/off)
author darius@inchoate.localdomain
date Sun, 06 Jul 2008 22:42:32 +0930
parents 5898fba6593c
children efd44dc40934
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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 #include "cons.h"
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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 /*-----------------------------------------------------------------------------
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52 * Configure the IO port as we need
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53 */
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54 void
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55 OWInit(void) {
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56 OWBUSINIT();
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57 OWSETBUSHIGH();
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58 }
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59
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60 /*-----------------------------------------------------------------------------
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61 * Generate a 1-Wire reset, return 0 if presence pulse was found, 1 if it
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62 * wasn't, or 2 if the line appears to be being held low.
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63 *
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64 * (NOTE: Does not handle alarm presence from DS2404/DS1994)
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65 */
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66 uint8_t
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67 OWTouchReset(void) {
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68 OWDELAY_G;
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69
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70 /* Check the bus isn't being held low (ie it's broken) Do it after
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71 * the delay so we guarantee we don't see a slave from a previous
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72 * comms attempt
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73 */
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74 if(OWREADBUS() == 0)
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75 return 2;
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76
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77 OWSETBUSLOW();
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78 OWDELAY_H;
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79 OWSETBUSHIGH();
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80 OWDELAY_I;
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81
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82 return(OWREADBUS());
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83 }
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84
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85 /*-----------------------------------------------------------------------------
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86 * Send a 1-wire write bit.
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87 */
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88 void
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89 OWWriteBit(uint8_t bit) {
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90 OWDELAY_I;
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91
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92 if (bit) {
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93 OWSETBUSLOW();
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94 OWDELAY_A;
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95 OWSETBUSHIGH();
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96 OWDELAY_B;
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97 } else {
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98 OWSETBUSLOW();
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99 OWDELAY_C;
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100 OWSETBUSHIGH();
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101 OWDELAY_D;
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102 }
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103 }
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104
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105 /*-----------------------------------------------------------------------------
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106 * Read a bit from the 1-wire bus and return it.
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107 */
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108 uint8_t
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109 OWReadBit(void) {
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110 OWDELAY_I;
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111
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112 OWSETBUSLOW();
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113 OWDELAY_A;
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114 OWSETBUSHIGH();
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115 OWDELAY_E;
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116 return(OWREADBUS());
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117 }
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118
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119 /*-----------------------------------------------------------------------------
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120 * Write a byte to the 1-wire bus
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121 */
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122 void
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123 OWWriteByte(uint8_t data) {
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124 uint8_t i;
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125
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126 /* Send LSB first */
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127 for (i = 0; i < 8; i++) {
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128 OWWriteBit(data & 0x01);
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129 data >>= 1;
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130 }
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131 }
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132
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133 /*-----------------------------------------------------------------------------
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134 * Read a byte from the 1-wire bus
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135 */
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136 uint8_t
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137 OWReadByte(void) {
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138 int i, result = 0;
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139
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140 for (i = 0; i < 8; i++) {
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141 result >>= 1;
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142 if (OWReadBit())
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143 result |= 0x80;
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144 }
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145 return(result);
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146 }
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147
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148 /*-----------------------------------------------------------------------------
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149 * Write a 1-wire data byte and return the sampled result.
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150 */
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151 uint8_t
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152 OWTouchByte(uint8_t data) {
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153 uint8_t i, result = 0;
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154
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155 for (i = 0; i < 8; i++) {
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156 result >>= 1;
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157
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158 /* If sending a 1 then read a bit, otherwise write a 0 */
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159 if (data & 0x01) {
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160 if (OWReadBit())
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161 result |= 0x80;
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162 } else
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163 OWWriteBit(0);
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164
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165 data >>= 1;
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166 }
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167
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168 return(result);
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169 }
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170
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171 /*-----------------------------------------------------------------------------
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172 * Write a block of bytes to the 1-wire bus and return the sampled result in
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173 * the same buffer
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174 */
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175 void
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176 OWBlock(uint8_t *data, int len) {
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177 int i;
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178
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179 for (i = 0; i < len; i++)
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180 data[i] = OWTouchByte(data[i]);
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181 }
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182
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183
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184 /*-----------------------------------------------------------------------------
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185 * Send a 1 wire command to a device, or all if no ROM ID provided
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186 */
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187 void
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188 OWSendCmd(uint8_t *ROM, uint8_t cmd) {
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189 uint8_t i;
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190
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191 OWTouchReset();
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192
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193 if (ROM == NULL)
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194 OWWriteByte(OW_SKIP_ROM_CMD);
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195 else {
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196 OWWriteByte(OW_MATCH_ROM_CMD);
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197 for (i = 0; i < 8; i++)
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198 OWWriteByte(ROM[i]);
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199 }
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200 OWWriteByte(cmd);
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201 }
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202
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203 /*-----------------------------------------------------------------------------
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204 * Search algorithm from App note 187 (and 162)
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205 *
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206 * OWFirst/OWNext return..
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207 * 1 when something is found,
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208 * 0 no more modules
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209 * -1 if no presence pulse,
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210 * -2 if bad CRC,
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211 * -3 if bad wiring.
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212 */
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213 uint8_t
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214 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
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215 /* Reset state */
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216 OW_LastDiscrepancy = 0;
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217 OW_LastDevice = 0;
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218 OW_LastFamilyDiscrepancy = 0;
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219
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220 /* Go looking */
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221 return (OWNext(ROM, do_reset, alarm_only));
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222 }
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223
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224 /* Returns 1 when something is found, 0 if nothing left */
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225 uint8_t
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226 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
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227 uint8_t bit_test, search_direction, bit_number;
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228 uint8_t last_zero, rom_byte_number, rom_byte_mask;
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229 uint8_t lastcrc8, crcaccum;
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230 int8_t next_result;
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231
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232 /* Init for search */
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233 bit_number = 1;
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234 last_zero = 0;
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235 rom_byte_number = 0;
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236 rom_byte_mask = 1;
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237 next_result = OW_NOMODULES;
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238 lastcrc8 = 0;
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239 crcaccum = 0;
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240
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241 /* if the last call was not the last one */
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242 if (!OW_LastDevice) {
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243 /* check if reset first is requested */
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244 if (do_reset) {
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245 /* reset the 1-wire
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246 * if there are no parts on 1-wire, return 0 */
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247 OWPUTSP(PSTR("Resetting\r\n"));
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248 switch (OWTouchReset()) {
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249 case 0:
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250 break;
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251
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252 case 1:
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253 /* reset the search */
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254 OW_LastDiscrepancy = 0;
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255 OW_LastFamilyDiscrepancy = 0;
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256 OWPUTSP(PSTR("No devices on bus\r\n"));
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257 return OW_NOPRESENCE;
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258 break;
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259
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260 case 2:
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261 /* reset the search */
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262 OW_LastDiscrepancy = 0;
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263 OW_LastFamilyDiscrepancy = 0;
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264 OWPUTSP(PSTR("Bus appears to be being held low\r\n"));
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265 return OW_BADWIRE;
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266 break;
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267
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268 }
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269 }
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270
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271 /* If finding alarming devices issue a different command */
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272 if (alarm_only)
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273 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */
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274 else
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275 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */
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276
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277 /* pause before beginning the search */
32
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278 OWDELAY_I;
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279 OWDELAY_I;
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280 OWDELAY_I;
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281
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282 /* loop to do the search */
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283 do {
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284 /* read a bit and its compliment */
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285 bit_test = OWReadBit() << 1;
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286 bit_test |= OWReadBit();
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287
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288 OWPRINTFP(PSTR("bit_test = %d\r\n"), bit_test);
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289
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290 /* check for no devices on 1-wire */
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291 if (bit_test == 3) {
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292 OWPRINTFP(PSTR("bit_test = %d\r\n"), bit_test);
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293 return(OW_BADWIRE);
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294 }
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295 else {
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296 /* all devices coupled have 0 or 1 */
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297 if (bit_test > 0)
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298 search_direction = !(bit_test & 0x01); /* bit write value for search */
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299 else {
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300 /* if this discrepancy is before the Last Discrepancy
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301 * on a previous OWNext then pick the same as last time */
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302 if (bit_number < OW_LastDiscrepancy)
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303 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0);
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304 else
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305 /* if equal to last pick 1, if not then pick 0 */
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306 search_direction = (bit_number == OW_LastDiscrepancy);
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307
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308 /* if 0 was picked then record its position in LastZero */
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309 if (search_direction == 0) {
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310 last_zero = bit_number;
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311
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312 /* check for Last discrepancy in family */
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313 if (last_zero < 9)
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314 OW_LastFamilyDiscrepancy = last_zero;
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315 }
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316 }
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317
21
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318 /* set or clear the bit in the ROM byte rom_byte_number
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319 * with mask rom_byte_mask */
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320 if (search_direction == 1)
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321 ROM[rom_byte_number] |= rom_byte_mask;
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322 else
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323 ROM[rom_byte_number] &= ~rom_byte_mask;
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324
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325 /* serial number search direction write bit */
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326 OWWriteBit(search_direction);
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327
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328 /* increment the byte counter bit_number
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329 * and shift the mask rom_byte_mask */
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330 bit_number++;
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331 rom_byte_mask <<= 1;
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332
21
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333 /* if the mask is 0 then go to new ROM byte rom_byte_number
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334 * and reset mask */
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335 if (rom_byte_mask == 0) {
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336 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */
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337 lastcrc8 = crcaccum;
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338
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339 rom_byte_number++;
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340 rom_byte_mask = 1;
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341 }
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342 }
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343 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */
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344
21
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345 /* if the search was successful then */
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346 if (!(bit_number < 65) || lastcrc8) {
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347 if (lastcrc8) {
41
5898fba6593c Add temperature control.
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348 OWPRINTFP(PSTR("Bad CRC (%d)\r\n"), lastcrc8);
21
e82d15fa9a1a Re-format the code.
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349 next_result = OW_BADCRC;
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350 } else {
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351 /* search successful so set LastDiscrepancy,LastDevice,next_result */
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352 OW_LastDiscrepancy = last_zero;
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353 OW_LastDevice = (OW_LastDiscrepancy == 0);
41
5898fba6593c Add temperature control.
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354 OWPRINTFP(PSTR("Last device = %d\r\n"), OW_LastDevice);
21
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355 next_result = OW_FOUND;
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356 }
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357 }
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358 }
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359
21
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360 /* if no device found then reset counters so next 'next' will be
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361 * like a first */
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362 if (next_result != OW_FOUND || ROM[0] == 0) {
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parents: 16
diff changeset
363 OW_LastDiscrepancy = 0;
e82d15fa9a1a Re-format the code.
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diff changeset
364 OW_LastDevice = 0;
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365 OW_LastFamilyDiscrepancy = 0;
e82d15fa9a1a Re-format the code.
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diff changeset
366 }
0
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367
21
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368 if (next_result == OW_FOUND && ROM[0] == 0x00)
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369 next_result = OW_BADWIRE;
10
eb1faf51968e - Add some useful return values to search functions.
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parents: 8
diff changeset
370
21
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diff changeset
371 return next_result;
0
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372
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373 }
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374
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375 uint8_t PROGMEM dscrc_table[] = {
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376 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
ffeab3c04e83 Initial revision
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377 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
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378 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
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379 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
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380 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
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381 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
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diff changeset
382 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
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383 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
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diff changeset
384 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205,
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diff changeset
385 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80,
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386 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238,
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387 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
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388 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
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389 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
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390 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
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391 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
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392 };
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393
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
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parents: 32
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394 /*-----------------------------------------------------------------------------
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diff changeset
395 * Update *crc based on the value of x
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diff changeset
396 */
0
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parents:
diff changeset
397 void
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parents:
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398 OWCRC(uint8_t x, uint8_t *crc) {
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parents:
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399 *crc = pgm_read_byte(&dscrc_table[(*crc) ^ x]);
ffeab3c04e83 Initial revision
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parents:
diff changeset
400 }
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
401
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
402 /*-----------------------------------------------------------------------------
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
403 * Program a DS2502's memory
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
404 *
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
405 * Arguments
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
406 * ROM - ROM ID (or NULL to send SKIP_ROM)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
407 * start - Start address (bytes)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
408 * len - Length of data to write
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
409 * data - Data to write
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
410 * exact - If true, only accept exact matches for programming,
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
411 * otherwise only ensure the bits we requested were
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
412 * programmed [to 0]
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
413 * status - If true program status rather than memory
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
414 *
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
415 * Returns..
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
416 * 0 if all is OK
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
417 * 1 if the programming was unsuccessful
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
418 * 2 if the parameters were invalid
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
419 * 3 if the DS2502 didn't respond appropriately (also happens if the
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
420 * module doesn't exist)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
421 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
422 uint8_t
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
423 OWProgROM(uint8_t *ROM, uint8_t start, uint8_t len, uint8_t *data, uint8_t exact, uint8_t status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
424 #if defined(OWSETVPPON) && defined(OWSETVPPOFF)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
425 uint8_t crc, i, tmp;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
426
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
427 /* Stupid programmer detection */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
428 if (status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
429 if (start + len > 3)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
430 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
431 } else {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
432 if (start + len > 127)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
433 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
434 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
435
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
436 if (len < 1)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
437 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
438
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
439 OWDELAY_I;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
440 if (OWTouchReset() != 0) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
441 cons_putsP(PSTR("No presence pulse\r\n"));
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
442 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
443 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
444
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
445 crc = 0;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
446
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
447 /* Send the command */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
448 if (status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
449 OWSendCmd(ROM, OW_WRITE_STATUS);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
450 OWCRC(OW_WRITE_STATUS, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
451 } else {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
452 OWSendCmd(ROM, OW_WRITE_MEMORY);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
453 OWCRC(OW_WRITE_MEMORY, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
454 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
455
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
456 /* And the start address
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
457 * (2 bytes even though one would do)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
458 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
459 OWWriteByte(start);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
460 OWCRC(start, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
461
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
462 OWWriteByte(0x00);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
463 OWCRC(0x00, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
464
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
465 for (i = 0; i < len; i++) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
466 cons_putsP(PSTR("Programming "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
467 cons_puts_hex(data[i]);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
468 cons_putsP(PSTR(" to "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
469 cons_puts_hex(start + i);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
470 cons_putsP(PSTR("\r\n"));
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
471
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
472 OWWriteByte(data[i]);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
473 OWCRC(data[i], &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
474
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
475 tmp = OWReadByte();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
476
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
477 if (crc != tmp) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
478 cons_putsP(PSTR("CRC mismatch "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
479 cons_puts_hex(crc);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
480 cons_putsP(PSTR(" vs "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
481 cons_puts_hex(tmp);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
482 cons_putsP(PSTR("\r\n"));
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
483
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
484 OWTouchReset();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
485 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
486 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
487
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
488 OWSETVPPON();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
489 OWDELAY_H;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
490 OWSETVPPOFF();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
491
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
492 tmp = OWReadByte();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
493
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
494 /* Check the bits we turned off are off */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
495 /*
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
496 for (i = 0; i < 8; i++)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
497 if (!(data[i] & 1 << i) && (tmp & 1 << i))
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
498 return(-3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
499 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
500 if ((!data[i] & tmp) != 0) {
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
501 cons_putsP(PSTR("Readback mismatch "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
502 cons_puts_hex(data[i]);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
503 cons_putsP(PSTR(" vs "));
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
504 cons_puts_hex(data[i]);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
505 cons_putsP(PSTR("\r\n"));
33
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
506
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
507 OWTouchReset();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
508 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
509 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
510
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
511 /* The DS2502 loads it's CRC register with the address of the
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
512 * next byte */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
513 crc = 0;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
514 OWCRC(start + i + 1, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
515 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
516
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
517 return(0);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
518 #else
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
519 return(1);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
520 #endif
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
521 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally
darius
parents: 32
diff changeset
522
41
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
523 /*
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
524 * OWGetTemp
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
525 *
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
526 * Get the temperature from a 1wire bus module
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
527 *
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
528 * Returns temperature in hundredths of a degree or OW_TEMP_xxx on
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
529 * error.
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
530 */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
531 int16_t
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
532 OWGetTemp(uint8_t *ROM) {
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
533 int8_t i;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
534 uint8_t crc, buf[9];
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
535 int16_t temp;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
536 int16_t tfrac;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
537
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
538 if (ROM[0] != OW_FAMILY_TEMP)
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
539 return OW_TEMP_WRONG_FAM;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
540
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
541 OWSendCmd(ROM, OW_CONVERTT_CMD);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
542
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
543 i = 0;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
544
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
545 /* Wait for the conversion */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
546 while (OWReadBit() == 0)
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
547 i = 1;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
548
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
549 /* Check that we talked to a module and it did something */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
550 if (i == 0) {
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
551 return OW_TEMP_NO_ROM;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
552 }
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
553
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
554 OWSendCmd(ROM, OW_RD_SCR_CMD);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
555 crc = 0;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
556 for (i = 0; i < 8; i++) {
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
557 buf[i] = OWReadByte();
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
558 OWCRC(buf[i], &crc);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
559 }
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
560 buf[i] = OWReadByte();
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
561 if (crc != buf[8])
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
562 return OW_TEMP_CRC_ERR;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
563 temp = buf[0];
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
564 if (buf[1] & 0x80)
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
565 temp -= 256;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
566
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
567 /* Chop off 0.5 degree bit */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
568 temp >>= 1;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
569
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
570 /* Calulate the fractional remainder */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
571 tfrac = buf[7] - buf[6];
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
572
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
573 /* Work in 100'th of degreess to save on floats */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
574 tfrac *= (int16_t)100;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
575
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
576 /* Divide by count */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
577 tfrac /= buf[7];
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
578
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
579 /* Subtract 0.25 deg from temp */
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
580 tfrac += 75;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
581 if (tfrac < 100)
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
582 temp--;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
583 else
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
584 tfrac -= 100;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
585
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
586 i = temp;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
587 temp *= 100;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
588 temp += tfrac;
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
589
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
590 return(temp);
5898fba6593c Add temperature control.
darius@inchoate.localdomain
parents: 33
diff changeset
591 }