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drivers: sensor: BME280: add forced sampling mode

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add the forced sampling mode, to take just a single
measurement when fatching a sample

Signed-off-by: Christian Hirsch <christian.hirsch@tuwien.ac.at>
This commit is contained in:
Christian Hirsch 2020-03-23 11:51:57 +01:00 • committed by Maureen Helm
commit 6380c24626
3 changed files with 36 additions and 1 deletions
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12
drivers/sensor/bme280/Kconfig
View file

@ -12,6 +12,18 @@ menuconfig BME280
if BME280
choice
prompt "BME280 sampling mode"
default BME280_MODE_NORMAL
help
Select sampling mode. In normal mode continuous measurements are
performed, whereas in forced mode only single measurement is performed.
config BME280_MODE_NORMAL
bool "normal"
config BME280_MODE_FORCED
bool "forced"
endchoice
choice
prompt "BME280 temperature oversampling"
default BME280_TEMP_OVER_2X

15
drivers/sensor/bme280/bme280.c
View file

@ -169,6 +169,21 @@ static int bme280_sample_fetch(struct device *dev, enum sensor_channel chan)
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);
#ifdef CONFIG_BME280_MODE_FORCED
ret = bm280_reg_write(data, BME280_REG_CTRL_MEAS, BME280_CTRL_MEAS_VAL);
if (ret < 0) {
return ret;
}
do {
k_sleep(K_MSEC(3));
ret = bm280_reg_read(data, BME280_REG_STATUS, buf, 1);
if (ret < 0) {
return ret;
}
} while (buf[0] & 0x08);
#endif
if (data->chip_id == BME280_CHIP_ID) {
size = 8;
}

10
drivers/sensor/bme280/bme280.h
View file

@ -19,14 +19,22 @@
#define BME280_REG_CONFIG 0xF5
#define BME280_REG_CTRL_MEAS 0xF4
#define BME280_REG_CTRL_HUM 0xF2
#define BME280_REG_STATUS 0xF3
#define BMP280_CHIP_ID_SAMPLE_1 0x56
#define BMP280_CHIP_ID_SAMPLE_2 0x57
#define BMP280_CHIP_ID_MP 0x58
#define BME280_CHIP_ID 0x60
#define BME280_MODE_FORCED 0x01
#define BME280_MODE_NORMAL 0x03
#define BME280_SPI_3W_DISABLE 0x00
#if defined CONFIG_BME280_MODE_NORMAL
#define BME280_MODE BME280_MODE_NORMAL
#elif defined CONFIG_BME280_MODE_FORCED
#define BME280_MODE BME280_MODE_FORCED
#endif
#if defined CONFIG_BME280_TEMP_OVER_1X
#define BME280_TEMP_OVER (1 << 5)
#elif defined CONFIG_BME280_TEMP_OVER_2X
@ -95,7 +103,7 @@
#define BME280_CTRL_MEAS_VAL (BME280_PRESS_OVER | \
BME280_TEMP_OVER | \
BME280_MODE_NORMAL)
BME280_MODE)
#define BME280_CONFIG_VAL (BME280_STANDBY | \
BME280_FILTER | \
BME280_SPI_3W_DISABLE)