Tue, 26 Nov 2019 11:55:46 +0100
Version 0.2.1. When wakeup by user push, select the active unit screen if only one unit is active.
/** * @file task_adc.c * @brief The FreeRTOS task to query the pressure sensors connected to ADC inputs. * The task will update the ADC_State structure. */ #include "config.h" #define DEFAULT_VREF 1093 ///< Use adc2_vref_to_gpio() to obtain a better estimate #define NO_OF_SAMPLES 128 ///< Multisampling #define PRESSURE_1 (CONFIG_PRESSURE_1) #define PRESSURE_2 (CONFIG_PRESSURE_2) #define PRESSURE_3 (CONFIG_PRESSURE_3) #define BATT_CHANNEL (CONFIG_BATT_CHANNEL) static const char *TAG = "task_adc"; SemaphoreHandle_t xSemaphoreADC = NULL; ///< Semaphire ADC task EventGroupHandle_t xEventGroupADC; ///< Events ADC task ADC_State *adc_state; ///< Public state for other tasks const int TASK_ADC_REQUEST_PRESSURE = BIT0; ///< Request temperature measurements const int TASK_ADC_REQUEST_DONE = BIT1; ///< Request is completed void request_adc(void) { xEventGroupClearBits(xEventGroupADC, TASK_ADC_REQUEST_DONE); xEventGroupSetBits(xEventGroupADC, TASK_ADC_REQUEST_PRESSURE); } bool ready_adc(void) { if (xEventGroupGetBits(xEventGroupADC) & TASK_ADC_REQUEST_DONE) return true; return false; } /* * Task to read pressure sensors and battery voltage on request. */ void task_adc(void *pvParameter) { int i, adc_reading; adc_atten_t atten = ADC_ATTEN_DB_0; ESP_LOGI(TAG, "Starting task ADC sensors"); adc_state = malloc(sizeof(ADC_State)); for (i = 0; i < 3; i++) { adc_state->Pressure[i].valid = false; adc_state->Pressure[i].atten = ADC_ATTEN_DB_0; adc_state->Pressure[i].voltage = 0; adc_state->Pressure[i].error = ADC_ERR_NONE; } adc_state->Pressure[0].channel = PRESSURE_1; adc_state->Pressure[1].channel = PRESSURE_2; adc_state->Pressure[2].channel = PRESSURE_3; adc_state->Batt_voltage = 0; adc_state->Batt_error = ADC_ERR_NONE; //Characterize ADC esp_adc_cal_characteristics_t *adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t)); /* event handler and event group for this task */ xEventGroupADC = xEventGroupCreate(); EventBits_t uxBits; /* * Task loop forever. */ while (1) { uxBits = xEventGroupWaitBits(xEventGroupADC, TASK_ADC_REQUEST_PRESSURE, pdFALSE, pdFALSE, portMAX_DELAY ); if (uxBits & TASK_ADC_REQUEST_PRESSURE) { ESP_LOGD(TAG, "Requested ADC readings"); adc1_config_width(ADC_WIDTH_BIT_12); for (i = 0; i < 3; i++) { adc_reading = 0; atten = ADC_ATTEN_DB_0; /* * Autoranging the ADC conversion */ while (1) { esp_adc_cal_characterize(ADC_UNIT_1, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars); adc1_config_channel_atten((adc1_channel_t)adc_state->Pressure[i].channel, atten); int raw = adc1_get_raw((adc1_channel_t)adc_state->Pressure[i].channel); if (atten == ADC_ATTEN_DB_0 && raw > 3700) atten = ADC_ATTEN_DB_2_5; else if (atten == ADC_ATTEN_DB_2_5 && raw > 3700) atten = ADC_ATTEN_DB_6; else if (atten == ADC_ATTEN_DB_6 && raw > 3700) atten = ADC_ATTEN_DB_11; else break; } /* * Now that he have the best attenuation, multisample the real value. */ for (int j = 0; j < NO_OF_SAMPLES; j++) { int tmp = adc1_get_raw((adc1_channel_t)adc_state->Pressure[i].channel); if (tmp < 0) { adc_reading = -1; break; } adc_reading += tmp; } if (xSemaphoreTake(xSemaphoreADC, 10) == pdTRUE) { if (adc_reading < 0) { adc_state->Pressure[i].error = ADC_ERR_READ; adc_state->Pressure[i].voltage = 0; } else { adc_reading /= NO_OF_SAMPLES; adc_state->Pressure[i].voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars); // voltage in mV adc_state->Pressure[i].error = ADC_ERR_NONE; } xSemaphoreGive(xSemaphoreADC); } else { ESP_LOGE(TAG, "Missed lock 1"); } ESP_LOGI(TAG, "Pressure %d raw: %4d, atten: %d, %.3f volt, error: %d", i, adc_reading, atten, adc_state->Pressure[i].voltage / 1000.0, adc_state->Pressure[i].error); } /* * Read VDD by reading 1/2 VDD from a precision ladder. */ adc_reading = 0; atten = ADC_ATTEN_DB_6; // Don't use DB_11, it has a bad linearity. esp_adc_cal_characterize(ADC_UNIT_1, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars); adc1_config_channel_atten((adc1_channel_t)BATT_CHANNEL, atten); for (int j = 0; j < NO_OF_SAMPLES; j++) { int tmp = adc1_get_raw((adc1_channel_t)BATT_CHANNEL); if (tmp < 0) { adc_reading = -1; break; } adc_reading += tmp; } if (xSemaphoreTake(xSemaphoreADC, 10) == pdTRUE) { if (adc_reading < 0) { adc_state->Batt_voltage = 3.3; adc_state->Batt_error = ADC_ERR_READ; } else { adc_reading /= NO_OF_SAMPLES; adc_state->Batt_voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars) * 2; // Chip supply voltage in mV adc_state->Batt_error = ADC_ERR_NONE; } xSemaphoreGive(xSemaphoreADC); } else { ESP_LOGE(TAG, "Missed lock 2"); } xEventGroupClearBits(xEventGroupADC, TASK_ADC_REQUEST_PRESSURE); xEventGroupSetBits(xEventGroupADC, TASK_ADC_REQUEST_DONE); #if 1 ESP_LOGI(TAG, "Battery raw: %4d, atten: %d %.3f volt, error: %d", adc_reading, atten, adc_state->Batt_voltage / 1000.0, adc_state->Batt_error); #endif } } }