drivers: sensor: HS300x DF Command Update (0abba589) · Commits · Wenxi XU / zephyr

drivers/sensor/hs300x/hs300x.c

+8 −3

Original line number	Diff line number	Diff line
		@@ -58,6 +58,7 @@ static int hs300x_sample_fetch(const struct device *dev, enum sensor_channel cha
		struct hs300x_data *data = dev->data;
		const struct hs300x_config *cfg = dev->config;
		int rc;
		uint8_t df_dummy = 0x0;

		if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_AMBIENT_TEMP &&
		chan != SENSOR_CHAN_HUMIDITY) {
		@@ -65,10 +66,14 @@ static int hs300x_sample_fetch(const struct device *dev, enum sensor_channel cha
		}

		/*
		* Initiate a measurement simply by sending 7-bit address followed
		* by an eighth bit set to 0 (write) and NO data.
		* By default, the sensor should be factory-programmed to operate in Sleep Mode.
		* A Measurement Request (MR) command is required to exit the sensor
		* from its sleep state. An MR command should consist of the 7-bit address followed
		* by an eighth bit set to 0 (write). However, many I2C controllers cannot generate
		* merely the address byte with no data. To overcome this limitation the MR command
		* should be followed by a dummy byte (zero value).
		*/
		rc = i2c_write_dt(&cfg->bus, NULL, 0);
		rc = i2c_write_dt(&cfg->bus, (const uint8_t *)&df_dummy, 1);
		if (rc < 0) {
		LOG_ERR("Failed to start measurement.");
		return rc;