Due to the time required for the sensor to startup, this driver is meant to be used in an asynchronous fashion.
More...
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file | bmp-280-sensor.c |
| Driver for the Sensortag BMP280 Altimeter / Pressure Sensor.
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file | bmp-280-sensor.h |
| Header file for the Sensortag BMP280 Altimeter / Pressure Sensor.
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static void | init (void) |
| Initalise the sensor.
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static void | enable_sensor (bool enable) |
| Enable/disable measurements. More...
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static bool | read_data (uint8_t *data) |
| Read temperature and pressure data. More...
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static void | convert (uint8_t *data, int32_t *temp, uint32_t *press) |
| Convert raw data to values in degrees C (temp) and Pascal (pressure) More...
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static int | value (int type) |
| Returns a reading from the sensor. More...
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static int | configure (int type, int enable) |
| Configuration function for the BMP280 sensor. More...
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static int | status (int type) |
| Returns the status of the sensor. More...
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const struct sensors_sensor | bmp_280_sensor |
| Exports a global symbol to be used by the sensor API.
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Due to the time required for the sensor to startup, this driver is meant to be used in an asynchronous fashion.
The caller must first activate the sensor by calling SENSORS_ACTIVATE(). This will trigger the sensor's startup sequence, but the call will not wait for it to complete so that the CPU can perform other tasks or drop to a low power mode.
Once the sensor is stable, the driver will generate a sensors_changed event.
We take readings in "Forced" mode. In this mode, the BMP will take a single measurement and it will then automatically go to sleep.
SENSORS_ACTIVATE must be called again to trigger a new reading cycle
◆ configure()
static int configure |
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int |
type, |
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int |
enable |
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Configuration function for the BMP280 sensor.
- Parameters
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type | Activate, enable or disable the sensor. See below |
enable | When type == SENSORS_HW_INIT we turn on the hardware When type == SENSORS_ACTIVE and enable==1 we enable the sensor When type == SENSORS_ACTIVE and enable==0 we disable the sensor |
Definition at line 342 of file bmp-280-sensor.c.
◆ convert()
static void convert |
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uint8_t * |
data, |
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int32_t * |
temp, |
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uint32_t * |
press |
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Convert raw data to values in degrees C (temp) and Pascal (pressure)
- Parameters
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data | Pointer to a buffer that holds raw sensor data |
temp | Pointer to a variable where the converted temperature will be written |
press | Pointer to a variable where the converted pressure will be written |
Definition at line 227 of file bmp-280-sensor.c.
◆ enable_sensor()
static void enable_sensor |
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bool |
enable | ) |
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static |
Enable/disable measurements.
- Parameters
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enable | 0: disable, enable otherwise |
- Returns
- none
Definition at line 182 of file bmp-280-sensor.c.
◆ read_data()
static bool read_data |
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uint8_t * |
data | ) |
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Read temperature and pressure data.
- Parameters
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data | Pointer to a buffer where temperature and pressure will be written (6 bytes) |
- Returns
- True if valid data could be retrieved
Definition at line 204 of file bmp-280-sensor.c.
◆ status()
static int status |
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int |
type | ) |
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Returns the status of the sensor.
- Parameters
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type | SENSORS_ACTIVE or SENSORS_READY |
- Returns
- 1 if the sensor is enabled
Definition at line 377 of file bmp-280-sensor.c.
◆ value()
static int value |
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int |
type | ) |
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static |
Returns a reading from the sensor.
- Parameters
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type | BMP_280_SENSOR_TYPE_TEMP or BMP_280_SENSOR_TYPE_PRESS |
- Returns
- Temperature (centi degrees C) or Pressure (Pascal).
Definition at line 293 of file bmp-280-sensor.c.