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BMP280 driver: Forced mode. Soft reset.

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This commit is contained in:
sheinz 2016-07-07 23:39:25 +03:00
parent 4a2679271e
commit 440ad67834
3 changed files with 93 additions and 5 deletions
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33
extras/bmp280/bmp280.c
View file

@ -163,6 +163,10 @@ bool bmp280_init(bmp280_params_t *params, uint8_t scl_pin, uint8_t sda_pin)
uint8_t oversampling_temp =
(params->oversampling == BMP280_ULTRA_HIGH_RES) ? 2 : 1;
if (params->mode == BMP280_MODE_FORCED) {
params->mode = BMP280_MODE_SLEEP; // initial mode for forced is sleep
}
uint8_t ctrl = (oversampling_temp << 5) | (params->oversampling << 2)
| (params->mode);
@ -176,7 +180,25 @@ bool bmp280_init(bmp280_params_t *params, uint8_t scl_pin, uint8_t sda_pin)
bool bmp280_force_measurement()
{
// TODO: implement
uint8_t ctrl = read_register8(BMP280_REG_CTRL);
ctrl &= ~0b11; // clear two lower bits
ctrl |= BMP280_MODE_FORCED;
debug("Writing ctrl reg=%x", ctrl);
if (!write_register8(BMP280_REG_CTRL, ctrl)) {
debug("Failed starting forced mode");
return false;
}
return true;
}
bool bmp280_is_measuring()
{
uint8_t status = read_register8(BMP280_REG_STATUS);
if (status & (1<<3)) {
debug("Status: measuring");
return true;
}
debug("Status: idle");
return false;
}
@ -255,3 +277,12 @@ bool bmp280_read(float *temperature, float *pressure)
return true;
}
bool bmp280_soft_reset()
{
if (!write_register8(BMP280_REG_RESET, BMP280_RESET_VALUE)) {
debug("Failed resetting sensor");
return false;
}
return true;
}

22
extras/bmp280/bmp280.h
View file

@ -30,7 +30,7 @@
/**
* Uncomment to enable debug output.
*/
#define BMP280_DEBUG
// #define BMP280_DEBUG
/**
* BMP280 address is 0x77 if SDO pin is high,
@ -44,6 +44,7 @@
* Normal - Continues measurement.
*/
typedef enum {
BMP280_MODE_SLEEP = 0,
BMP280_MODE_FORCED = 1,
BMP280_MODE_NORMAL = 3
} BMP280_Mode;
@ -95,7 +96,11 @@ typedef struct {
/**
* Initialize default parameters.
* Default configuration is NORMAL mode.
* Default configuration:
* mode: NORAML
* filter: OFF
* oversampling: x4
* standby time: 250ms
*/
void bmp280_init_default_params(bmp280_params_t *params);
@ -111,9 +116,22 @@ bool bmp280_init(bmp280_params_t *params, uint8_t scl_pin, uint8_t sda_pin);
*/
bool bmp280_force_measurement();
/**
* Check if BMP280 is busy with measuring temperature/pressure.
* Return true if BMP280 is busy.
*/
bool bmp280_is_measuring();
/**
* Read compensated temperature and pressure data.
* Temperature in degrees Celsius.
* Pressure in Pascals.
*/
bool bmp280_read(float *temperature, float *pressure);
/**
* Restart BMP280 module.
*/
bool bmp280_soft_reset();
#endif // __BMP280_H__