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bmp180: make a lower level interface available and support oversampling.

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An application using multiple I2C devices will need it's own
loop. This reworks the code to make the detection, calibration
constant loading, and measurment functions available too without
having to use the bmp810 task which is still retained.

Adds support for oversampling.

Fixes a bug in the calculation of the temperature.

Better error handling. Checks for I2C errors and errors in the loading
of the calibration constants and propagates these up.
This commit is contained in:
ourairquality 2016-07-19 00:43:16 +10:00
parent 6915caf49c
commit 05bbe48bd4
3 changed files with 190 additions and 155 deletions
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27
extras/bmp180/bmp180.h
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@ -52,4 +52,31 @@ void bmp180_trigger_pressure_measurement(const xQueueHandle* resultQueue);
// Give the user the chance to create it's own handler
extern bool (*bmp180_informUser)(const xQueueHandle* resultQueue, uint8_t cmd, bmp180_temp_t temperature, bmp180_press_t pressure);
// Calibration constants
typedef struct
{
int16_t AC1;
int16_t AC2;
int16_t AC3;
uint16_t AC4;
uint16_t AC5;
uint16_t AC6;
int16_t B1;
int16_t B2;
int16_t MB;
int16_t MC;
int16_t MD;
} bmp180_constants_t;
// Returns true if the bmp180 is detected.
bool bmp180_is_available();
// Reads all the internal constants, returning true on success.
bool bmp180_fillInternalConstants(bmp180_constants_t *c);
// Reads an optional temperature and pressure. The over sampling
// setting, oss, may be 0 to 3. Returns true on success.
bool bmp180_measure(bmp180_constants_t *c, int32_t *temperature,
uint32_t *pressure, uint8_t oss);
#endif /* DRIVER_BMP180_H_ */