Tue, 08 Oct 2019 12:00:31 +0200
Initial import of the CO2 meter application.
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1 | /* |
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2 | * MIT License |
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3 | * |
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4 | * Copyright (c) 2017 David Antliff |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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7 | * of this software and associated documentation files (the "Software"), to deal |
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8 | * in the Software without restriction, including without limitation the rights |
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9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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10 | * copies of the Software, and to permit persons to whom the Software is |
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11 | * furnished to do so, subject to the following conditions: |
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12 | * |
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13 | * The above copyright notice and this permission notice shall be included in all |
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14 | * copies or substantial portions of the Software. |
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15 | * |
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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22 | * SOFTWARE. |
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23 | */ |
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24 | |
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25 | /** |
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26 | * @file ds18b20.c |
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27 | * |
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28 | * Resolution is cached in the DS18B20_Info object to avoid querying the hardware |
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29 | * every time a temperature conversion is required. However this can result in the |
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30 | * cached value becoming inconsistent with the hardware value, so care must be taken. |
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31 | * |
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32 | */ |
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33 | |
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34 | #include <stddef.h> |
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35 | #include <string.h> |
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36 | #include <stdlib.h> |
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37 | #include <stdbool.h> |
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38 | #include <stdint.h> |
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39 | #include <math.h> |
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40 | |
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41 | #include "freertos/FreeRTOS.h" |
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42 | #include "freertos/task.h" |
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43 | #include "driver/gpio.h" |
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44 | #include "esp_system.h" |
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45 | #include "esp_log.h" |
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46 | |
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47 | #include "ds18b20.h" |
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48 | #include "owb.h" |
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49 | |
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50 | static const char * TAG = "ds18b20"; |
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51 | static const int T_CONV = 750; // maximum conversion time at 12-bit resolution in milliseconds |
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52 | |
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53 | // Function commands |
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54 | #define DS18B20_FUNCTION_TEMP_CONVERT 0x44 ///< Start temperature conversion |
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55 | #define DS18B20_FUNCTION_SCRATCHPAD_WRITE 0x4E ///< Write scratchpad |
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56 | #define DS18B20_FUNCTION_SCRATCHPAD_READ 0xBE ///< Read scratchpad |
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57 | #define DS18B20_FUNCTION_SCRATCHPAD_COPY 0x48 ///< Copy scratchpad |
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58 | #define DS18B20_FUNCTION_EEPROM_RECALL 0xB8 ///< EEPROM recall |
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59 | #define DS18B20_FUNCTION_POWER_SUPPLY_READ 0xB4 ///< Read powersupply mode |
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60 | |
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61 | /// @cond ignore |
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62 | typedef struct |
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63 | { |
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64 | uint8_t temperature[2]; // [0] is LSB, [1] is MSB |
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65 | uint8_t trigger_high; |
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66 | uint8_t trigger_low; |
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67 | uint8_t configuration; |
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68 | uint8_t reserved[3]; |
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69 | uint8_t crc; |
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70 | } Scratchpad; |
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71 | /// @endcond ignore |
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72 | |
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73 | static void _init(DS18B20_Info * ds18b20_info, const OneWireBus * bus) |
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74 | { |
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75 | if (ds18b20_info != NULL) |
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76 | { |
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77 | ds18b20_info->bus = bus; |
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78 | memset(&ds18b20_info->rom_code, 0, sizeof(ds18b20_info->rom_code)); |
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79 | ds18b20_info->use_crc = false; |
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80 | ds18b20_info->resolution = DS18B20_RESOLUTION_INVALID; |
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81 | ds18b20_info->solo = false; // assume multiple devices unless told otherwise |
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82 | ds18b20_info->init = true; |
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83 | } |
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84 | else |
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85 | { |
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86 | ESP_LOGE(TAG, "ds18b20_info is NULL"); |
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87 | } |
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88 | } |
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89 | |
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90 | static bool _is_init(const DS18B20_Info * ds18b20_info) |
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91 | { |
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92 | bool ok = false; |
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93 | if (ds18b20_info != NULL) |
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94 | { |
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95 | if (ds18b20_info->init) |
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96 | { |
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97 | // OK |
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98 | ok = true; |
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99 | } |
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100 | else |
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101 | { |
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102 | ESP_LOGE(TAG, "ds18b20_info is not initialised"); |
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103 | } |
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104 | } |
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105 | else |
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106 | { |
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107 | ESP_LOGE(TAG, "ds18b20_info is NULL"); |
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108 | } |
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109 | return ok; |
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110 | } |
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111 | |
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112 | static bool _address_device(const DS18B20_Info * ds18b20_info) |
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113 | { |
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114 | bool present = false; |
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115 | if (_is_init(ds18b20_info)) |
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116 | { |
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117 | owb_reset(ds18b20_info->bus, &present); |
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118 | if (present) |
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119 | { |
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120 | if (ds18b20_info->solo) |
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121 | { |
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122 | // if there's only one device on the bus, we can skip |
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123 | // sending the ROM code and instruct it directly |
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124 | owb_write_byte(ds18b20_info->bus, OWB_ROM_SKIP); |
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125 | } |
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126 | else |
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127 | { |
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128 | // if there are multiple devices on the bus, a Match ROM command |
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129 | // must be issued to address a specific slave |
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130 | owb_write_byte(ds18b20_info->bus, OWB_ROM_MATCH); |
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131 | owb_write_rom_code(ds18b20_info->bus, ds18b20_info->rom_code); |
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132 | } |
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133 | } |
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134 | else |
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135 | { |
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136 | ESP_LOGE(TAG, "ds18b20 device not responding"); |
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137 | } |
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138 | } |
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139 | return present; |
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140 | } |
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141 | |
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142 | static bool _check_resolution(DS18B20_RESOLUTION resolution) |
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143 | { |
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144 | return (resolution >= DS18B20_RESOLUTION_9_BIT) && (resolution <= DS18B20_RESOLUTION_12_BIT); |
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145 | } |
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146 | |
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147 | static float _wait_for_conversion(DS18B20_RESOLUTION resolution) |
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148 | { |
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149 | float elapsed_time = 0.0f; |
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150 | if (_check_resolution(resolution)) |
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151 | { |
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152 | int divisor = 1 << (DS18B20_RESOLUTION_12_BIT - resolution); |
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153 | ESP_LOGD(TAG, "divisor %d", divisor); |
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154 | float max_conversion_time = (float)T_CONV / (float)divisor; |
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155 | int ticks = ceil(max_conversion_time / portTICK_PERIOD_MS); |
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156 | ESP_LOGD(TAG, "wait for conversion: %.3f ms, %d ticks", max_conversion_time, ticks); |
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157 | |
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158 | // wait at least this maximum conversion time |
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159 | vTaskDelay(ticks); |
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160 | |
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161 | // TODO: measure elapsed time more accurately |
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162 | elapsed_time = ticks * portTICK_PERIOD_MS; |
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163 | } |
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164 | return elapsed_time; |
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165 | } |
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166 | |
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167 | static float _decode_temp(uint8_t lsb, uint8_t msb, DS18B20_RESOLUTION resolution) |
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168 | { |
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169 | float result = 0.0f; |
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170 | if (_check_resolution(resolution)) |
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171 | { |
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172 | // masks to remove undefined bits from result |
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173 | static const uint8_t lsb_mask[4] = { ~0x03, ~0x02, ~0x01, ~0x00 }; |
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174 | uint8_t lsb_masked = lsb_mask[resolution - DS18B20_RESOLUTION_9_BIT] & lsb; |
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175 | int16_t raw = (msb << 8) | lsb_masked; |
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176 | result = raw / 16.0f; |
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177 | } |
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178 | else |
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179 | { |
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180 | ESP_LOGE(TAG, "Unsupported resolution %d", resolution); |
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181 | } |
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182 | return result; |
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183 | } |
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184 | |
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185 | static size_t _min(size_t x, size_t y) |
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186 | { |
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187 | return x > y ? y : x; |
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188 | } |
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189 | |
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190 | static Scratchpad _read_scratchpad(const DS18B20_Info * ds18b20_info, size_t count) |
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191 | { |
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192 | count = _min(sizeof(Scratchpad), count); // avoid overflow |
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193 | Scratchpad scratchpad = {0}; |
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194 | ESP_LOGD(TAG, "scratchpad read %d bytes: ", count); |
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195 | if (_address_device(ds18b20_info)) |
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196 | { |
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197 | owb_write_byte(ds18b20_info->bus, DS18B20_FUNCTION_SCRATCHPAD_READ); |
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198 | owb_read_bytes(ds18b20_info->bus, (uint8_t *)&scratchpad, count); |
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199 | //esp_log_buffer_hex(TAG, &scratchpad, count); |
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200 | } |
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201 | return scratchpad; |
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202 | } |
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203 | |
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204 | static bool _write_scratchpad(const DS18B20_Info * ds18b20_info, const Scratchpad * scratchpad, bool verify) |
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205 | { |
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206 | bool result = false; |
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207 | // Only bytes 2, 3 and 4 (trigger and configuration) can be written. |
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208 | // All three bytes MUST be written before the next reset to avoid corruption. |
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209 | if (_is_init(ds18b20_info)) |
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210 | { |
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211 | if (_address_device(ds18b20_info)) |
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212 | { |
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213 | owb_write_byte(ds18b20_info->bus, DS18B20_FUNCTION_SCRATCHPAD_WRITE); |
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214 | owb_write_bytes(ds18b20_info->bus, (uint8_t *)&scratchpad->trigger_high, 3); |
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215 | ESP_LOGD(TAG, "scratchpad write 3 bytes:"); |
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216 | //esp_log_buffer_hex(TAG, &scratchpad->trigger_high, 3); |
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217 | result = true; |
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218 | |
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219 | if (verify) |
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220 | { |
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221 | Scratchpad read = _read_scratchpad(ds18b20_info, offsetof(Scratchpad, configuration) + 1); |
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222 | if (memcmp(&scratchpad->trigger_high, &read.trigger_high, 3) != 0) |
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223 | { |
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224 | ESP_LOGE(TAG, "scratchpad verify failed: " |
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225 | "wrote {0x%02x, 0x%02x, 0x%02x}, " |
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226 | "read {0x%02x, 0x%02x, 0x%02x}", |
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227 | scratchpad->trigger_high, scratchpad->trigger_low, scratchpad->configuration, |
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228 | read.trigger_high, read.trigger_low, read.configuration); |
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229 | result = false; |
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230 | } |
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231 | } |
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232 | } |
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233 | } |
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234 | return result; |
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235 | } |
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236 | |
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237 | |
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238 | // Public API |
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239 | |
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240 | DS18B20_Info * ds18b20_malloc(void) |
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241 | { |
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242 | DS18B20_Info * ds18b20_info = malloc(sizeof(*ds18b20_info)); |
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243 | if (ds18b20_info != NULL) |
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244 | { |
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245 | memset(ds18b20_info, 0, sizeof(*ds18b20_info)); |
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246 | ESP_LOGD(TAG, "malloc %p", ds18b20_info); |
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247 | } |
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248 | else |
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249 | { |
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250 | ESP_LOGE(TAG, "malloc failed"); |
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251 | } |
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252 | |
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253 | return ds18b20_info; |
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254 | } |
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255 | |
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256 | void ds18b20_free(DS18B20_Info ** ds18b20_info) |
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257 | { |
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258 | if (ds18b20_info != NULL && (*ds18b20_info != NULL)) |
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259 | { |
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260 | ESP_LOGD(TAG, "free %p", *ds18b20_info); |
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261 | free(*ds18b20_info); |
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262 | *ds18b20_info = NULL; |
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263 | } |
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264 | } |
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265 | |
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266 | void ds18b20_init(DS18B20_Info * ds18b20_info, const OneWireBus * bus, OneWireBus_ROMCode rom_code) |
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267 | { |
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268 | if (ds18b20_info != NULL) |
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269 | { |
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270 | _init(ds18b20_info, bus); |
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271 | ds18b20_info->rom_code = rom_code; |
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272 | |
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273 | // read current resolution from device as it may not be power-on or factory default |
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274 | ds18b20_info->resolution = ds18b20_read_resolution(ds18b20_info); |
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275 | } |
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276 | else |
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277 | { |
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278 | ESP_LOGE(TAG, "ds18b20_info is NULL"); |
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279 | } |
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280 | } |
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281 | |
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282 | void ds18b20_init_solo(DS18B20_Info * ds18b20_info, const OneWireBus * bus) |
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283 | { |
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284 | if (ds18b20_info != NULL) |
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285 | { |
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286 | _init(ds18b20_info, bus); |
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287 | ds18b20_info->solo = true; |
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288 | |
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289 | // read current resolution from device as it may not be power-on or factory default |
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290 | ds18b20_info->resolution = ds18b20_read_resolution(ds18b20_info); |
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291 | } |
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292 | else |
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293 | { |
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294 | ESP_LOGE(TAG, "ds18b20_info is NULL"); |
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295 | } |
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296 | } |
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297 | |
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298 | void ds18b20_use_crc(DS18B20_Info * ds18b20_info, bool use_crc) |
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299 | { |
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300 | if (_is_init(ds18b20_info)) |
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301 | { |
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302 | ds18b20_info->use_crc = use_crc; |
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303 | ESP_LOGD(TAG, "use_crc %d", ds18b20_info->use_crc); |
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304 | } |
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305 | } |
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306 | |
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307 | bool ds18b20_set_resolution(DS18B20_Info * ds18b20_info, DS18B20_RESOLUTION resolution) |
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308 | { |
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309 | bool result = false; |
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310 | if (_is_init(ds18b20_info)) |
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311 | { |
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312 | if (_check_resolution(ds18b20_info->resolution)) |
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313 | { |
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314 | // read scratchpad up to and including configuration register |
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315 | Scratchpad scratchpad = _read_scratchpad(ds18b20_info, |
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316 | offsetof(Scratchpad, configuration) - offsetof(Scratchpad, temperature) + 1); |
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317 | |
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318 | // modify configuration register to set resolution |
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319 | uint8_t value = (((resolution - 1) & 0x03) << 5) | 0x1f; |
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320 | scratchpad.configuration = value; |
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321 | ESP_LOGD(TAG, "configuration value 0x%02x", value); |
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322 | |
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323 | // write bytes 2, 3 and 4 of scratchpad |
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324 | result = _write_scratchpad(ds18b20_info, &scratchpad, /* verify */ true); |
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325 | if (result) |
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326 | { |
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327 | ds18b20_info->resolution = resolution; |
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328 | ESP_LOGD(TAG, "Resolution set to %d bits", (int)resolution); |
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329 | } |
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330 | else |
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331 | { |
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332 | // Resolution change failed - update the info resolution with the value read from configuration |
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333 | ds18b20_info->resolution = ds18b20_read_resolution(ds18b20_info); |
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334 | ESP_LOGW(TAG, "Resolution consistency lost - refreshed from device: %d", ds18b20_info->resolution); |
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335 | } |
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Initial import of the CO2 meter application.
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336 | } |
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337 | else |
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338 | { |
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339 | ESP_LOGE(TAG, "Unsupported resolution %d", resolution); |
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340 | } |
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341 | } |
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342 | return result; |
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343 | } |
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344 | |
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345 | DS18B20_RESOLUTION ds18b20_read_resolution(DS18B20_Info * ds18b20_info) |
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346 | { |
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347 | DS18B20_RESOLUTION resolution = DS18B20_RESOLUTION_INVALID; |
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348 | if (_is_init(ds18b20_info)) |
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349 | { |
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350 | // read scratchpad up to and including configuration register |
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351 | Scratchpad scratchpad = _read_scratchpad(ds18b20_info, |
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352 | offsetof(Scratchpad, configuration) - offsetof(Scratchpad, temperature) + 1); |
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353 | |
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354 | resolution = ((scratchpad.configuration >> 5) & 0x03) + DS18B20_RESOLUTION_9_BIT; |
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355 | if (!_check_resolution(resolution)) |
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356 | { |
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357 | ESP_LOGE(TAG, "invalid resolution read from device: 0x%02x", scratchpad.configuration); |
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358 | resolution = DS18B20_RESOLUTION_INVALID; |
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359 | } |
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360 | else |
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Initial import of the CO2 meter application.
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361 | { |
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Initial import of the CO2 meter application.
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362 | ESP_LOGD(TAG, "Resolution read as %d", resolution); |
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Initial import of the CO2 meter application.
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363 | } |
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Initial import of the CO2 meter application.
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364 | } |
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Initial import of the CO2 meter application.
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365 | return resolution; |
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Initial import of the CO2 meter application.
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366 | } |
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Initial import of the CO2 meter application.
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367 | |
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368 | bool ds18b20_convert(const DS18B20_Info * ds18b20_info) |
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369 | { |
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Initial import of the CO2 meter application.
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370 | bool result = false; |
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371 | if (_is_init(ds18b20_info)) |
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372 | { |
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373 | const OneWireBus * bus = ds18b20_info->bus; |
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374 | if (_address_device(ds18b20_info)) |
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375 | { |
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376 | // initiate a temperature measurement |
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377 | owb_write_byte(bus, DS18B20_FUNCTION_TEMP_CONVERT); |
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Initial import of the CO2 meter application.
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378 | result = true; |
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379 | } |
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Initial import of the CO2 meter application.
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380 | else |
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Initial import of the CO2 meter application.
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parents:
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381 | { |
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Initial import of the CO2 meter application.
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382 | ESP_LOGE(TAG, "ds18b20 device not responding"); |
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Initial import of the CO2 meter application.
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383 | } |
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Initial import of the CO2 meter application.
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384 | } |
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Initial import of the CO2 meter application.
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385 | return result; |
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Initial import of the CO2 meter application.
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386 | } |
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Initial import of the CO2 meter application.
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parents:
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387 | |
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Initial import of the CO2 meter application.
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parents:
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388 | void ds18b20_convert_all(const OneWireBus * bus) |
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Initial import of the CO2 meter application.
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parents:
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389 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
390 | bool is_present = false; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
391 | owb_reset(bus, &is_present); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
392 | owb_write_byte(bus, OWB_ROM_SKIP); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
393 | owb_write_byte(bus, DS18B20_FUNCTION_TEMP_CONVERT); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
394 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
395 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
396 | float ds18b20_wait_for_conversion(const DS18B20_Info * ds18b20_info) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
397 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
398 | float elapsed_time = 0.0f; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
399 | if (_is_init(ds18b20_info)) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
400 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
401 | elapsed_time = _wait_for_conversion(ds18b20_info->resolution); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
402 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
403 | return elapsed_time; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
404 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
405 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
406 | DS18B20_ERROR ds18b20_read_temp(const DS18B20_Info * ds18b20_info, float * value) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
407 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
408 | DS18B20_ERROR err = DS18B20_ERROR_UNKNOWN; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
409 | if (_is_init(ds18b20_info)) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
410 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
411 | const OneWireBus * bus = ds18b20_info->bus; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
412 | if (_address_device(ds18b20_info)) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
413 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
414 | // read measurement |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
415 | if (owb_write_byte(bus, DS18B20_FUNCTION_SCRATCHPAD_READ) == OWB_STATUS_OK) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
416 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
417 | err = DS18B20_OK; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
418 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
419 | uint8_t temp_LSB = 0; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
420 | uint8_t temp_MSB = 0; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
421 | if (!ds18b20_info->use_crc) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
422 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
423 | // Without CRC: |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
424 | owb_read_byte(bus, &temp_LSB); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
425 | owb_read_byte(bus, &temp_MSB); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
426 | bool is_present = false; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
427 | owb_reset(bus, &is_present); // terminate early |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
428 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
429 | else |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
430 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
431 | // with CRC: |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
432 | uint8_t buffer[9] = {0}; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
433 | owb_read_bytes(bus, buffer, 9); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
434 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
435 | temp_LSB = buffer[0]; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
436 | temp_MSB = buffer[1]; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
437 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
438 | if (owb_crc8_bytes(0, buffer, 9) != 0) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
439 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
440 | ESP_LOGE(TAG, "CRC failed"); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
441 | temp_LSB = 0x00; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
442 | temp_MSB = 0x80; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
443 | err = DS18B20_ERROR_CRC; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
444 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
445 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
446 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
447 | if (err == DS18B20_OK) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
448 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
449 | float temp = _decode_temp(temp_LSB, temp_MSB, ds18b20_info->resolution); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
450 | ESP_LOGD(TAG, "temp_LSB 0x%02x, temp_MSB 0x%02x, temp %f", temp_LSB, temp_MSB, temp); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
451 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
452 | if (value) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
453 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
454 | *value = temp; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
455 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
456 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
457 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
458 | else |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
459 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
460 | ESP_LOGE(TAG, "owb_write_byte failed"); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
461 | err = DS18B20_ERROR_OWB; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
462 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
463 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
464 | else |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
465 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
466 | ESP_LOGE(TAG, "ds18b20 device not responding"); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
467 | err = DS18B20_ERROR_DEVICE; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
468 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
469 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
470 | return err; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
471 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
472 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
473 | DS18B20_ERROR ds18b20_convert_and_read_temp(const DS18B20_Info * ds18b20_info, float * value) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
474 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
475 | DS18B20_ERROR err = DS18B20_ERROR_UNKNOWN; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
476 | if (_is_init(ds18b20_info)) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
477 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
478 | if (ds18b20_convert(ds18b20_info)) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
479 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
480 | // wait at least maximum conversion time |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
481 | _wait_for_conversion(ds18b20_info->resolution); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
482 | if (value) |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
483 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
484 | *value = 0.0f; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
485 | err = ds18b20_read_temp(ds18b20_info, value); |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
486 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
487 | else |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
488 | { |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
489 | err = DS18B20_ERROR_NULL; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
490 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
491 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
492 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
493 | return err; |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
494 | } |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
495 | |
88d965579617
Initial import of the CO2 meter application.
Michiel Broek <mbroek@mbse.eu>
parents:
diff
changeset
|
496 |