main/task_bmp280.c

/**
 * @file task_bmp280.c
 * @brief The FreeRTOS task to query the BMP280 sensor.
 */


#include "config.h"


static const char		*TAG = "task_bmp280";

SemaphoreHandle_t		xSemaphoreBMP280 = NULL;	///< Semaphore BMP280 task
EventGroupHandle_t		xEventGroupBMP280;		///< Events BMP280 task
BMP280_State			*bmp280_state;			///< Public state for other tasks

extern bmp280_params_t		bmp280_params;
extern bmp280_t			bmp280_dev;

const int TASK_BMP280_REQUEST_DONE = BIT0;			///< All requests are done.
const int TASK_BMP280_REQUEST_TB = BIT1;			///< Request Temperature and Barometer


void request_bmp280(void)
{
    xEventGroupClearBits(xEventGroupBMP280, TASK_BMP280_REQUEST_DONE);
    xEventGroupSetBits(xEventGroupBMP280, TASK_BMP280_REQUEST_TB);
}


bool ready_bmp280(void)
{
    if (xEventGroupGetBits(xEventGroupBMP280) & TASK_BMP280_REQUEST_DONE)
	return true;
    return false;
}


/*
 * Task to read BMP280 sensor on request.
 */
void task_bmp280(void *pvParameter)
{
    float pressure, temperature, humidity;
    int		error = 0;

    ESP_LOGI(TAG, "Starting task BMP280 sda=%d scl=%d", CONFIG_I2C_MASTER_SDA, CONFIG_I2C_MASTER_SCL);
    bmp280_state = malloc(sizeof(BMP280_State));
    
    bmp280_state->valid = false;
    bmp280_state->fake = (bmp280_dev.i2c_dev.addr == 0) ? true:false;
    bmp280_state->address = bmp280_dev.i2c_dev.addr;
    bmp280_state->error = BMP280_ERR_NONE;

    /* event handler and event group for this task */
    xEventGroupBMP280 = xEventGroupCreate();
    EventBits_t uxBits;

    /*
     * Task loop forever.
     */
    ESP_LOGI(TAG, "Starting loop BMP280 sensor 0x%02x %d", bmp280_state->address, bmp280_state->fake);
    while (1) {

	uxBits = xEventGroupWaitBits(xEventGroupBMP280, TASK_BMP280_REQUEST_TB, pdFALSE, pdFALSE, portMAX_DELAY );

	if (uxBits & TASK_BMP280_REQUEST_TB) {

	    if (! bmp280_state->fake) {
		/* Real sensor is present */
		error = bmp280_read_float(&bmp280_dev, &temperature, &pressure, &humidity);
		if (xSemaphoreTake(xSemaphoreBMP280, 25) == pdTRUE) {
		    if (error == ESP_OK) {
			bmp280_state->error = BMP280_ERR_NONE;
			bmp280_state->valid = true;
			bmp280_state->temperature = temperature;
			bmp280_state->pressure = pressure;
			bmp280_state->humidity = humidity;
		    } else {
			bmp280_state->error = BMP280_ERR_READ;
			bmp280_state->valid = false;
			bmp280_state->temperature = 0;
			bmp280_state->pressure = 0;
			bmp280_state->humidity = 0;
		    }
		    xSemaphoreGive(xSemaphoreBMP280);
		}
	    } else {
		/* Use fake values */
		if (xSemaphoreTake(xSemaphoreBMP280, 25) == pdTRUE) {
		    bmp280_state->error = BMP280_ERR_NONE;
                    bmp280_state->valid = true;
		    bmp280_state->temperature = 21.23;
                    bmp280_state->pressure = 101360;
                    bmp280_state->humidity = 0;
		    xSemaphoreGive(xSemaphoreBMP280);
		}
	    }

	    xEventGroupClearBits(xEventGroupBMP280, TASK_BMP280_REQUEST_TB);
	    xEventGroupSetBits(xEventGroupBMP280, TASK_BMP280_REQUEST_DONE);
#if 1
	    ESP_LOGI(TAG, "  TB: %.3f C, %.1f hPa, error: %d", bmp280_state->temperature, bmp280_state->pressure / 100, bmp280_state->error);
#endif
	}
    }
}