BMP280 driver: Forced mode. Soft reset.
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4a2679271e
commit
440ad67834
3 changed files with 93 additions and 5 deletions
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@ -8,12 +8,46 @@
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#include "bmp280/bmp280.h"
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// In forced mode user initiate measurement each time.
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// In normal mode measurement is done continuously with specified standby time.
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// #define MODE_FORCED
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const uint8_t scl_pin = 5;
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const uint8_t sda_pin = 4;
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#ifdef MODE_FORCED
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static void bmp280_task_forced(void *pvParameters)
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{
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bmp280_params_t params;
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float pressure, temperature;
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static void bmp280_task(void *pvParameters)
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bmp280_init_default_params(¶ms);
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params.mode = BMP280_MODE_FORCED;
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while (1) {
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while (!bmp280_init(¶ms, scl_pin, sda_pin)) {
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printf("BMP280 initialization failed\n");
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vTaskDelay(1000 / portTICK_RATE_MS);
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}
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while(1) {
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vTaskDelay(1000 / portTICK_RATE_MS);
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if (!bmp280_force_measurement()) {
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printf("Failed initiating measurement\n");
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break;
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}
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while (bmp280_is_measuring()) {}; // wait for measurement to complete
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if (!bmp280_read(&temperature, &pressure)) {
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printf("Temperature/pressure reading failed\n");
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break;
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}
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printf("Pressure: %.2f Pa, Temperature: %.2f C\n", pressure, temperature);
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}
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}
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}
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#else
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static void bmp280_task_normal(void *pvParameters)
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{
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bmp280_params_t params;
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float pressure, temperature;
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@ -35,6 +69,7 @@ static void bmp280_task(void *pvParameters)
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}
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}
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}
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#endif
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void user_init(void)
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{
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@ -45,5 +80,9 @@ void user_init(void)
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printf("SDK version : %s\n", sdk_system_get_sdk_version());
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printf("GIT version : %s\n", GITSHORTREV);
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xTaskCreate(bmp280_task, (signed char *)"bmp280_task", 256, NULL, 2, NULL);
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#ifdef MODE_FORCED
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xTaskCreate(bmp280_task_forced, (signed char *)"bmp280_task", 256, NULL, 2, NULL);
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#else
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xTaskCreate(bmp280_task_normal, (signed char *)"bmp280_task", 256, NULL, 2, NULL);
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#endif
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}
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@ -163,6 +163,10 @@ bool bmp280_init(bmp280_params_t *params, uint8_t scl_pin, uint8_t sda_pin)
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uint8_t oversampling_temp =
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(params->oversampling == BMP280_ULTRA_HIGH_RES) ? 2 : 1;
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if (params->mode == BMP280_MODE_FORCED) {
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params->mode = BMP280_MODE_SLEEP; // initial mode for forced is sleep
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}
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uint8_t ctrl = (oversampling_temp << 5) | (params->oversampling << 2)
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| (params->mode);
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@ -176,7 +180,25 @@ bool bmp280_init(bmp280_params_t *params, uint8_t scl_pin, uint8_t sda_pin)
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bool bmp280_force_measurement()
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{
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// TODO: implement
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uint8_t ctrl = read_register8(BMP280_REG_CTRL);
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ctrl &= ~0b11; // clear two lower bits
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ctrl |= BMP280_MODE_FORCED;
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debug("Writing ctrl reg=%x", ctrl);
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if (!write_register8(BMP280_REG_CTRL, ctrl)) {
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debug("Failed starting forced mode");
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return false;
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}
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return true;
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}
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bool bmp280_is_measuring()
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{
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uint8_t status = read_register8(BMP280_REG_STATUS);
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if (status & (1<<3)) {
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debug("Status: measuring");
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return true;
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}
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debug("Status: idle");
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return false;
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}
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@ -255,3 +277,12 @@ bool bmp280_read(float *temperature, float *pressure)
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return true;
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}
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bool bmp280_soft_reset()
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{
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if (!write_register8(BMP280_REG_RESET, BMP280_RESET_VALUE)) {
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debug("Failed resetting sensor");
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return false;
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}
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return true;
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}
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@ -30,7 +30,7 @@
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/**
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* Uncomment to enable debug output.
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*/
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#define BMP280_DEBUG
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// #define BMP280_DEBUG
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/**
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* BMP280 address is 0x77 if SDO pin is high,
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@ -44,6 +44,7 @@
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* Normal - Continues measurement.
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*/
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typedef enum {
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BMP280_MODE_SLEEP = 0,
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BMP280_MODE_FORCED = 1,
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BMP280_MODE_NORMAL = 3
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} BMP280_Mode;
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@ -95,7 +96,11 @@ typedef struct {
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/**
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* Initialize default parameters.
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* Default configuration is NORMAL mode.
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* Default configuration:
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* mode: NORAML
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* filter: OFF
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* oversampling: x4
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* standby time: 250ms
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*/
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void bmp280_init_default_params(bmp280_params_t *params);
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@ -111,9 +116,22 @@ bool bmp280_init(bmp280_params_t *params, uint8_t scl_pin, uint8_t sda_pin);
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*/
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bool bmp280_force_measurement();
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/**
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* Check if BMP280 is busy with measuring temperature/pressure.
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* Return true if BMP280 is busy.
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*/
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bool bmp280_is_measuring();
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/**
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* Read compensated temperature and pressure data.
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* Temperature in degrees Celsius.
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* Pressure in Pascals.
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*/
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bool bmp280_read(float *temperature, float *pressure);
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/**
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* Restart BMP280 module.
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*/
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bool bmp280_soft_reset();
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#endif // __BMP280_H__
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