151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT hoperf_th02
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/sys/byteorder.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/drivers/sensor.h>
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#include <zephyr/sys/__assert.h>
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#include <zephyr/logging/log.h>
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#include "th02.h"
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LOG_MODULE_REGISTER(TH02, CONFIG_SENSOR_LOG_LEVEL);
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static uint8_t read8(const struct i2c_dt_spec *i2c, uint8_t d)
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{
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uint8_t buf;
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if (i2c_reg_read_byte_dt(i2c, d, &buf) < 0) {
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LOG_ERR("Error reading register.");
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}
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return buf;
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}
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static int is_ready(const struct i2c_dt_spec *i2c)
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{
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uint8_t status;
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if (i2c_reg_read_byte_dt(i2c, TH02_REG_STATUS, &status) < 0) {
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LOG_ERR("error reading status register");
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}
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if (status & TH02_STATUS_RDY_MASK) {
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return 0;
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} else {
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return 1;
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}
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}
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static uint16_t get_humi(const struct i2c_dt_spec *i2c)
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{
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uint16_t humidity = 0U;
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if (i2c_reg_write_byte_dt(i2c, TH02_REG_CONFIG, TH02_CMD_MEASURE_HUMI) < 0) {
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LOG_ERR("Error writing register");
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return 0;
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}
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while (!is_ready(i2c)) {
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}
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humidity = read8(i2c, TH02_REG_DATA_H) << 8;
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humidity |= read8(i2c, TH02_REG_DATA_L);
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humidity >>= 4;
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return humidity;
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}
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uint16_t get_temp(const struct i2c_dt_spec *i2c)
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{
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uint16_t temperature = 0U;
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if (i2c_reg_write_byte_dt(i2c, TH02_REG_CONFIG, TH02_CMD_MEASURE_TEMP) < 0) {
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LOG_ERR("Error writing register");
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return 0;
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}
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while (!is_ready(i2c)) {
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}
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temperature = read8(i2c, TH02_REG_DATA_H) << 8;
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temperature |= read8(i2c, TH02_REG_DATA_L);
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temperature >>= 2;
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return temperature;
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}
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static int th02_sample_fetch(const struct device *dev,
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enum sensor_channel chan)
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{
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struct th02_data *drv_data = dev->data;
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const struct th02_config *cfg = dev->config;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP);
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drv_data->t_sample = get_temp(&cfg->i2c);
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LOG_INF("temp: %u", drv_data->t_sample);
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drv_data->rh_sample = get_humi(&cfg->i2c);
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LOG_INF("rh: %u", drv_data->rh_sample);
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return 0;
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}
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static int th02_channel_get(const struct device *dev,
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enum sensor_channel chan,
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struct sensor_value *val)
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{
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struct th02_data *drv_data = dev->data;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_AMBIENT_TEMP ||
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chan == SENSOR_CHAN_HUMIDITY);
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if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
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/* val = sample / 32 - 50 */
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val->val1 = drv_data->t_sample / 32U - 50;
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val->val2 = (drv_data->t_sample % 32) * (1000000 / 32);
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} else {
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/* val = sample / 16 -24 */
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val->val1 = drv_data->rh_sample / 16U - 24;
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val->val2 = (drv_data->rh_sample % 16) * (1000000 / 16);
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}
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return 0;
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}
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static const struct sensor_driver_api th02_driver_api = {
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.sample_fetch = th02_sample_fetch,
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.channel_get = th02_channel_get,
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};
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static int th02_init(const struct device *dev)
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{
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const struct th02_config *cfg = dev->config;
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if (!device_is_ready(cfg->i2c.bus)) {
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LOG_ERR("Bus device is not ready");
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return -ENODEV;
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}
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return 0;
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}
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#define TH02_DEFINE(inst) \
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static struct th02_data th02_data_##inst; \
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\
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static const struct th02_config th02_config_##inst = { \
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.i2c = I2C_DT_SPEC_INST_GET(inst), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(inst, th02_init, NULL, \
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&th02_data_##inst, &th02_config_##inst, POST_KERNEL, \
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CONFIG_SENSOR_INIT_PRIORITY, &th02_driver_api); \
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DT_INST_FOREACH_STATUS_OKAY(TH02_DEFINE)
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