4  * SPDX-License-Identifier: Apache-2.0
15 #include <zephyr/sys/crc.h>
37  * CRC algorithm parameters were taken from the
48 /* val = -45 + 175 * sample / (2^16) */
53 	tmp = (int32_t)raw * 175U - (45 << 16);  in shtcx_temperature_from_raw()
54 	val->val1 = tmp / 0x10000;  in shtcx_temperature_from_raw()
56 	val->val2 = ((tmp % 0x10000) * 15625) / 1024;  in shtcx_temperature_from_raw()
65 	val->val1 = tmp / 0x10000;  in shtcx_humidity_from_raw()
67 	val->val2 = (tmp % 0x10000) * 15625U / 1024;  in shtcx_humidity_from_raw()
72 	const struct shtcx_config *cfg = dev->config;  in shtcx_write_command()
76 	return i2c_write_dt(&cfg->i2c, tx_buf, sizeof(tx_buf));  in shtcx_write_command()
82 	const struct shtcx_config *cfg = dev->config;  in shtcx_read_words()
92 		return -EIO;  in shtcx_read_words()
95 	if (!cfg->clock_stretching) {  in shtcx_read_words()
99 	status = i2c_read_dt(&cfg->i2c, rx_buf, raw_len);  in shtcx_read_words()
102 		return -EIO;  in shtcx_read_words()
108 			LOG_DBG("invalid received invalid crc");  in shtcx_read_words()
109 			return -EIO;  in shtcx_read_words()
121 		return -EIO;  in shtcx_sleep()
130 		return -EIO;  in shtcx_wakeup()
140 	struct shtcx_data *data = dev->data;  in shtcx_sample_fetch()
141 	const struct shtcx_config *cfg = dev->config;  in shtcx_sample_fetch()
145 	if (cfg->chip == SHTC3) {  in shtcx_sample_fetch()
147 			return -EIO;  in shtcx_sample_fetch()
152 			     measure_cmd[cfg->measure_mode][cfg->clock_stretching],  in shtcx_sample_fetch()
153 			     (uint16_t *)&data->sample, 2,  in shtcx_sample_fetch()
154 			     measure_wait_us[cfg->chip][cfg->measure_mode]) < 0) {  in shtcx_sample_fetch()
156 		return -EIO;  in shtcx_sample_fetch()
159 	if (cfg->chip == SHTC3) {  in shtcx_sample_fetch()
162 			return -EIO;  in shtcx_sample_fetch()
173 	const struct shtcx_data *data = dev->data;  in shtcx_channel_get()
176 		shtcx_temperature_from_raw(data->sample.temp, val);  in shtcx_channel_get()
178 		shtcx_humidity_from_raw(data->sample.humidity, val);  in shtcx_channel_get()
180 		return -ENOTSUP;  in shtcx_channel_get()
193 	const struct shtcx_config *cfg = dev->config;  in shtcx_init()
196 	if (!device_is_ready(cfg->i2c.bus)) {  in shtcx_init()
198 		return -ENODEV;  in shtcx_init()
202 	if (cfg->chip == SHTC3) {  in shtcx_init()
205 			return -EIO;  in shtcx_init()
211 		return -EIO;  in shtcx_init()
217 		return -EIO;  in shtcx_init()
220 	if (cfg->chip == SHTC1) {  in shtcx_init()
223 			return -EINVAL;  in shtcx_init()
226 	if (cfg->chip == SHTC3) {  in shtcx_init()
229 			return -EINVAL;  in shtcx_init()
234 	LOG_DBG("Clock-stretching enabled: %d", cfg->clock_stretching);  in shtcx_init()
235 	LOG_DBG("Measurement mode: %d", cfg->measure_mode);  in shtcx_init()