Fri, 11 Oct 2019 15:56:30 +0200
Added publish logs. Another fix for DS18B20 rom address copy.
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1 | /** |
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2 | * @file task_ds18b20.c |
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3 | * @brief The FreeRTOS task to query the DS18B20 sensors on one or two |
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4 | * one-wire busses. Each bus must have only one sensor. That way |
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5 | * we don't need to care about the DS18B20 internal ROM address. |
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6 | * The task will update the DS18B20_State structure. |
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7 | */ |
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8 | |
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9 | |
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10 | #include "owb.h" |
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11 | #include "owb_rmt.h" |
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12 | #include "ds18b20.h" |
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13 | #include "config.h" |
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14 | |
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15 | |
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16 | #define GPIO_DS18B20_BUS (CONFIG_ONE_WIRE_BUS) |
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17 | #define DS18B20_RESOLUTION (DS18B20_RESOLUTION_12_BIT) |
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18 | |
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19 | |
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20 | static const char *TAG = "task_ds18b20"; |
3 | 21 | static const char *dsErrors[] = { "Ok", "CRC error", "Read error" }; |
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22 | |
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23 | SemaphoreHandle_t xSemaphoreDS18B20 = NULL; ///< Semaphire DS18B20 task |
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24 | EventGroupHandle_t xEventGroupDS18B20; ///< Events DS18B20 task |
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25 | DS18B20_State *ds18b20_state; ///< Public state for other tasks |
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26 | |
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27 | |
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28 | const int TASK_DS18B20_REQUEST_TEMPS = BIT0; ///< Request temperature measurements |
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29 | const int TASK_DS18B20_REQUEST_DONE = BIT1; ///< Request is completed |
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30 | |
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31 | |
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32 | |
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33 | void request_ds18b20(void) |
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34 | { |
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35 | xEventGroupClearBits(xEventGroupDS18B20, TASK_DS18B20_REQUEST_DONE); |
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36 | xEventGroupSetBits(xEventGroupDS18B20, TASK_DS18B20_REQUEST_TEMPS); |
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37 | } |
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38 | |
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39 | |
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40 | |
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41 | bool ready_ds18b20(void) |
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42 | { |
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43 | if (xEventGroupGetBits(xEventGroupDS18B20) & TASK_DS18B20_REQUEST_DONE) |
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44 | return true; |
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45 | return false; |
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46 | } |
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47 | |
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48 | |
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49 | |
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50 | /* |
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51 | * Task to read temperature sensors on request. |
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52 | */ |
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53 | void task_ds18b20(void *pvParameter) |
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54 | { |
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55 | int num_devices = 0; |
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56 | float readings = 0; |
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57 | bool found = false; |
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58 | DS18B20_ERROR errors = 0; |
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59 | |
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60 | ESP_LOGI(TAG, "Starting DS18B20 sensors"); |
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61 | ds18b20_state = malloc(sizeof(DS18B20_State)); |
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62 | ds18b20_state->valid = false; |
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63 | ds18b20_state->num_sensors = 0; |
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64 | |
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65 | for (int i = 0; i < DS18B20_MAX; i++) { |
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66 | ds18b20_state->sensor[i].temperature = 0.0; |
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67 | ds18b20_state->sensor[i].rom_code[0] = '\0'; |
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68 | ds18b20_state->sensor[i].error = DS18B20_ERR_READ; |
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69 | } |
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70 | |
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71 | /* event handler and event group for the wifi driver */ |
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72 | xEventGroupDS18B20 = xEventGroupCreate(); |
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73 | |
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74 | /* |
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75 | * Initialize the MLT and HLT one-wire busses. |
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76 | */ |
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77 | OneWireBus *owb; |
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78 | owb_rmt_driver_info rmt_driver_info_bottle; |
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79 | owb = owb_rmt_initialize(&rmt_driver_info_bottle, GPIO_DS18B20_BUS, RMT_CHANNEL_1, RMT_CHANNEL_0); |
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80 | owb_use_crc(owb, true); // enable CRC check for ROM code |
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81 | |
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82 | DS18B20_Info * ds18b20_info = ds18b20_malloc(); |
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83 | EventBits_t uxBits; |
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84 | |
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85 | /* |
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86 | * Task loop forever. |
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87 | */ |
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88 | while (1) { |
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89 | |
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90 | uxBits = xEventGroupWaitBits(xEventGroupDS18B20, TASK_DS18B20_REQUEST_TEMPS, pdFALSE, pdFALSE, portMAX_DELAY ); |
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91 | |
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92 | if (uxBits & TASK_DS18B20_REQUEST_TEMPS) { |
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93 | num_devices = 0; |
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94 | OneWireBus_SearchState search_state = {0}; |
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95 | found = false; |
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96 | owb_search_first(owb, &search_state, &found); |
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97 | while (found) { |
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98 | char rom_code_s[17]; |
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99 | owb_string_from_rom_code(search_state.rom_code, rom_code_s, sizeof(rom_code_s)); |
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100 | rom_code_s[16] = '\0'; |
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101 | printf(" %d : %s %d\n", num_devices + 1, rom_code_s, strlen(rom_code_s)); |
5 | 102 | strncpy(ds18b20_state->sensor[num_devices].rom_code, rom_code_s, 17); |
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103 | ++num_devices; |
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104 | owb_search_next(owb, &search_state, &found); |
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105 | } |
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106 | |
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107 | if (num_devices == 1) { |
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108 | ds18b20_init_solo(ds18b20_info, owb); // only one device on bus |
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109 | ds18b20_use_crc(ds18b20_info, true); // enable CRC check for temperature readings |
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110 | ds18b20_set_resolution(ds18b20_info, DS18B20_RESOLUTION); // returns true if ok. |
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111 | |
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112 | // Read temperatures more efficiently by starting conversions on all devices at the same time |
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113 | ds18b20_convert_all(owb); |
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114 | ds18b20_wait_for_conversion(ds18b20_info); |
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115 | |
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116 | errors = ds18b20_read_temp(ds18b20_info, &readings); |
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117 | |
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118 | if (xSemaphoreTake(xSemaphoreDS18B20, 25) == pdTRUE) { |
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119 | ds18b20_state->num_sensors = 1; |
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120 | if (errors == DS18B20_OK) { |
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121 | ds18b20_state->sensor[0].error = DS18B20_ERR_NONE; |
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122 | ds18b20_state->valid = true; |
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123 | ds18b20_state->sensor[0].temperature = readings; |
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124 | } else { |
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125 | if (errors == DS18B20_ERROR_CRC) |
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126 | ds18b20_state->sensor[0].error = DS18B20_ERR_CRC; |
3 | 127 | else |
128 | ds18b20_state->sensor[0].error = DS18B20_ERR_READ; // All other errors | |
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129 | ds18b20_state->valid = false; |
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130 | ds18b20_state->sensor[0].temperature = 0.0; |
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131 | } |
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132 | xSemaphoreGive(xSemaphoreDS18B20); |
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133 | } |
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134 | |
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135 | } else { |
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136 | /* |
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137 | * Zero or more then one device, this is an error. |
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138 | */ |
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139 | if (xSemaphoreTake(xSemaphoreDS18B20, 25) == pdTRUE) { |
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140 | if (num_devices == 0) |
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141 | ds18b20_state->sensor[0].error = DS18B20_ERR_READ; |
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142 | else |
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143 | ds18b20_state->sensor[0].error = DS18B20_ERR_READ; |
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144 | ds18b20_state->valid = false; |
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145 | ds18b20_state->num_sensors = 0; |
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146 | xSemaphoreGive(xSemaphoreDS18B20); |
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147 | } |
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148 | } // if num_devices == 1 |
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149 | |
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150 | xEventGroupClearBits(xEventGroupDS18B20, TASK_DS18B20_REQUEST_TEMPS); |
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151 | xEventGroupSetBits(xEventGroupDS18B20, TASK_DS18B20_REQUEST_DONE); |
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152 | #if 1 |
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153 | ESP_LOGI(TAG, "Temperature %.3f %s", ds18b20_state->sensor[0].temperature, dsErrors[ds18b20_state->sensor[0].error]); |
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154 | #endif |
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155 | } |
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156 | vTaskDelay( (TickType_t)10); |
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157 | } |
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158 | } |
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159 |