annotate simple_ds18b20.c @ 49:12236bceb6b0 default tip

snapshot export of the schematic
author Matt Johnston <matt@ucc.asn.au>
date Wed, 25 Jun 2014 21:29:52 +0800
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children
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0
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1 // Matt Johnston 2012
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2 // Based on ds18x20.c by Martin Thomas, in turn based on code by
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3 // Peter // Dannegger and others.
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4 //
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5 #include <stdio.h>
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6 #include <avr/pgmspace.h>
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7
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8 #include "ds18x20.h"
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9 #include "onewire.h"
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10 #include "crc8.h"
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11
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12 #include "simple_ds18b20.h"
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13
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14 uint8_t
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15 simple_ds18b20_start_meas(uint8_t id[])
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16 {
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17 uint8_t ret;
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18
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19 ow_reset();
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20 if( ow_input_pin_state() ) { // only send if bus is "idle" = high
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21 ow_command_with_parasite_enable(DS18X20_CONVERT_T, id);
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22 ret = DS18X20_OK;
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23 }
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24 else {
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25 ret = DS18X20_START_FAIL;
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26 }
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27
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28 return ret;
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29 }
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30
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31 static uint8_t
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32 read_scratchpad( uint8_t id[], uint8_t sp[], uint8_t n )
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33 {
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34 uint8_t i;
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35 uint8_t ret;
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36
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37 ow_command( DS18X20_READ, id );
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38 for ( i = 0; i < n; i++ ) {
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39 sp[i] = ow_byte_rd();
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40 }
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41 if ( crc8( &sp[0], DS18X20_SP_SIZE ) ) {
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42 ret = DS18X20_ERROR_CRC;
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43 } else {
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44 ret = DS18X20_OK;
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45 }
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46
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47 return ret;
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48 }
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49
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50 int16_t
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51 ds18b20_raw16_to_decicelsius(uint16_t measure)
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52 {
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53 uint8_t negative;
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54 int16_t decicelsius;
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55 uint16_t fract;
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56
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57 // check for negative
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58 if ( measure & 0x8000 ) {
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59 negative = 1; // mark negative
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60 measure ^= 0xffff; // convert to positive => (twos complement)++
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61 measure++;
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62 }
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63 else {
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64 negative = 0;
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65 }
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66
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67 decicelsius = (measure >> 4);
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68 decicelsius *= 10;
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69
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70 // decicelsius += ((measure & 0x000F) * 640 + 512) / 1024;
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71 // 625/1000 = 640/1024
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72 fract = ( measure & 0x000F ) * 640;
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73 if ( !negative ) {
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74 fract += 512;
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75 }
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76 fract /= 1024;
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77 decicelsius += fract;
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78
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79 if ( negative ) {
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80 decicelsius = -decicelsius;
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81 }
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82
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83 if ( decicelsius == 850 || decicelsius < -550 || decicelsius > 1250 ) {
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84 return DS18X20_INVALID_DECICELSIUS;
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85 } else {
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86 return decicelsius;
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87 }
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88 }
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89
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90 uint8_t
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91 simple_ds18b20_read_decicelsius( uint8_t id[], int16_t *decicelsius )
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92 {
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93 uint16_t reading;
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94 uint8_t ret;
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95
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96 ret = simple_ds18b20_read_raw(id, &reading);
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97 if (ret == DS18X20_OK)
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98 {
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99 *decicelsius = ds18b20_raw16_to_decicelsius(reading);
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100 }
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101 return ret;
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102 }
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103
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104 uint8_t
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105 simple_ds18b20_read_raw( uint8_t id[], uint16_t *reading )
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106 {
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107 uint8_t sp[DS18X20_SP_SIZE];
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108 uint8_t ret;
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109
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110 if (id)
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111 {
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112 ow_reset();
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113 }
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114 ret = read_scratchpad( id, sp, DS18X20_SP_SIZE );
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115 if ( ret == DS18X20_OK ) {
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116 *reading = sp[0] | (sp[1] << 8);
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117 }
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118 return ret;
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119 }
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120
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121 static void
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122 printhex_nibble(const unsigned char b, FILE *stream)
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123 {
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124 unsigned char c = b & 0x0f;
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125 if ( c > 9 ) {
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126 c += 'A'-10;
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127 }
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128 else {
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129 c += '0';
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130 }
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131 fputc(c, stream);
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132 }
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133
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134 void
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135 printhex_byte(const unsigned char b, FILE *stream)
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136 {
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137 printhex_nibble( b >> 4, stream);
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138 printhex_nibble( b, stream);
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139 }
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140
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141 void
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142 printhex(uint8_t *id, uint8_t n, FILE *stream)
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143 {
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144 for (uint8_t i = 0; i < n; i++)
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145 {
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146 if (i > 0)
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147 {
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148 fputc(' ', stream);
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149 }
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150 printhex_byte(id[i], stream);
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151 }
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152 }
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153
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154
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155 uint8_t
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156 simple_ds18b20_read_all()
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157 {
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158 uint8_t id[OW_ROMCODE_SIZE];
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159 for( uint8_t diff = OW_SEARCH_FIRST; diff != OW_LAST_DEVICE; )
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160 {
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161 diff = ow_rom_search( diff, &id[0] );
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162
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163 if( diff == OW_PRESENCE_ERR ) {
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164 printf_P( PSTR("No Sensor found\r") );
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165 return OW_PRESENCE_ERR; // <--- early exit!
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166 }
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167
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168 if( diff == OW_DATA_ERR ) {
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169 printf_P( PSTR("Bus Error\r") );
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170 return OW_DATA_ERR; // <--- early exit!
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171 }
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172
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173 int16_t decicelsius;
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174 uint8_t ret = simple_ds18b20_read_decicelsius(NULL, &decicelsius);
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175 if (ret != DS18X20_OK)
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176 {
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177 printf_P(PSTR("Failed reading\r"));
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178 return OW_DATA_ERR;
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179 }
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180
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181 printf_P(PSTR("DS18B20 %d: "), diff);
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182 if (crc8(id, OW_ROMCODE_SIZE))
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183 {
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184 printf_P(PSTR("CRC fail"));
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185 }
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186 printhex(id, OW_ROMCODE_SIZE, stdout);
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187 printf_P(PSTR(" %d.%d ÂșC\n"), decicelsius/10, decicelsius % 10);
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188 }
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189 printf_P(PSTR("Done sensors\n"));
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190 return DS18X20_OK;
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191 }
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192