qmp6988: Driver for QMP6988 digital temperature and pressure sensor

Defines

QMP6988_I2C_ADDR_GND

QMP6988_I2C_ADDR_VDD

Enums

enum qmp6988_power_mode_t

Possible measurement modes.

Values:

enumerator QMP6988_SLEEP_MODE

sleep mode

enumerator QMP6988_FORCED_MODE

one measurement then sleep again

enumerator QMP6988_NORMAL_MODE

power mode

enum qmp6988_filter_t

Possible filter modes.

Values:

enumerator QMP6988_FILTERCOEFF_OFF

enumerator QMP6988_FILTERCOEFF_2

enumerator QMP6988_FILTERCOEFF_4

enumerator QMP6988_FILTERCOEFF_8

enumerator QMP6988_FILTERCOEFF_16

enumerator QMP6988_FILTERCOEFF_32

enum qmp6988_oversampling_t

Possible oversampling modes.

Values:

enumerator QMP6988_OVERSAMPLING_SKIPPED

enumerator QMP6988_OVERSAMPLING_1X

enumerator QMP6988_OVERSAMPLING_2X

enumerator QMP6988_OVERSAMPLING_4X

enumerator QMP6988_OVERSAMPLING_8X

enumerator QMP6988_OVERSAMPLING_16X

enumerator QMP6988_OVERSAMPLING_32X

enumerator QMP6988_OVERSAMPLING_64X

Functions

esp_err_t qmp6988_init_desc(qmp6988_t *dev, uint8_t addr, i2c_port_t port, gpio_num_t sda_gpio, gpio_num_t scl_gpio)

Initialize device descriptor.

Parameters:

• dev – Device descriptor.

• addr – Device address.

• port – I2C port.

• sda_gpio – SDA GPIO.

• scl_gpio – SCL GPIO.

Returns:

ESP_OK on success.

esp_err_t qmp6988_free_desc(qmp6988_t *dev)

Free device descriptor.

Parameters:

dev – Device descriptor

Returns:

ESP_OK on success

esp_err_t qmp6988_init(qmp6988_t *dev)

Initialize sensor.

Parameters:

dev – Device descriptor

Returns:

ESP_OK on success

esp_err_t qmp6988_setup_powermode(qmp6988_t *dev, qmp6988_power_mode_t power_mode)

Set up power mode for QMP6988.

Parameters:

• dev – Device descriptor.

• power_mode – Power mode to be set.

Returns:

ESP_OK on success.

esp_err_t qmp6988_set_filter(qmp6988_t *dev, qmp6988_filter_t filter_mode)

Set up filter mode for QMP6988.

Parameters:

• dev – Device descriptor.

• filter_mode – Filter mode to be set.

Returns:

ESP_OK on success.

esp_err_t qmp6988_set_p_oversampling(qmp6988_t *dev, qmp6988_oversampling_t oversampling_p_mode)

Set up pressure oversampling mode for QMP6988.

Parameters:

• dev – Device descriptor.

• oversampling_p_mode – Oversampling mode for pressure to be set.

Returns:

ESP_OK on success.

esp_err_t qmp6988_set_t_oversampling(qmp6988_t *dev, qmp6988_oversampling_t oversampling_t_mode)

Set up temperature oversampling mode for QMP6988.

Parameters:

• dev – Device descriptor.

• oversampling_t_mode – Oversampling mode for temperature to be set.

Returns:

ESP_OK on success.

esp_err_t qmp6988_calc_pressure(qmp6988_t *dev, float *p)

Calculate pressure based on QMP6988 sensor data.

Parameters:

• dev – Device descriptor.

• p – [out] Calculated pressure in Pascals (Pa).

Returns:

ESP_OK on success.

esp_err_t qmp6988_calc_temperature(qmp6988_t *dev, float *t)

Calculate temperature based on QMP6988 sensor data.

Parameters:

• dev – Device descriptor.

• t – [out] Calculated temperature in degrees Celsius (°C).

Returns:

ESP_OK on success.

struct qmp6988_ik_data_t

#include <qmp6988.h>

Structure holding calibration data for QMP6988.

Public Members

int32_t a0

int32_t b00

int32_t a1

int32_t a2

int64_t bt1

int64_t bt2

int64_t bp1

int64_t b11

int64_t bp2

int64_t b12

int64_t b21

int64_t bp3

struct qmp6988_t

#include <qmp6988.h>

Device descriptor.

Public Members

i2c_dev_t i2c_dev

I2C device descriptor.

qmp6988_power_mode_t power_mode

used power mode

qmp6988_filter_t filter_mode

used filter mode

qmp6988_oversampling_t oversampling_t_mode

used oversampling temp mode

qmp6988_oversampling_t oversampling_p_mode

used oversampling pressure mode

qmp6988_ik_data_t ik

used calibration data

float temperature

measured temperature

float pressure

measured pressure