147 lines
3.1 KiB
C
147 lines
3.1 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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#include <kernel.h>
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#include <device.h>
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#include <i2c.h>
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#include <misc/byteorder.h>
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#include <misc/util.h>
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#include <sensor.h>
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#include <misc/__assert.h>
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#include <logging/log.h>
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#include "th02.h"
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#define LOG_LEVEL CONFIG_SENSOR_LOG_LEVEL
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LOG_MODULE_REGISTER(TH02);
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static u8_t read8(struct device *dev, u8_t d)
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{
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u8_t buf;
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if (i2c_reg_read_byte(dev, TH02_I2C_DEV_ID, 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(struct device *dev)
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{
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u8_t status;
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if (i2c_reg_read_byte(dev, TH02_I2C_DEV_ID,
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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 u16_t get_humi(struct device *dev)
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{
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u16_t humidity = 0U;
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if (i2c_reg_write_byte(dev, TH02_I2C_DEV_ID,
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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(dev)) {
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}
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;
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humidity = read8(dev, TH02_REG_DATA_H) << 8;
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humidity |= read8(dev, TH02_REG_DATA_L);
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humidity >>= 4;
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return humidity;
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}
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u16_t get_temp(struct device *dev)
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{
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u16_t temperature = 0U;
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if (i2c_reg_write_byte(dev, TH02_I2C_DEV_ID,
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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(dev)) {
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}
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;
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temperature = read8(dev, TH02_REG_DATA_H) << 8;
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temperature |= read8(dev, 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(struct device *dev, enum sensor_channel chan)
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{
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struct th02_data *drv_data = dev->driver_data;
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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(drv_data->i2c);
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LOG_INF("temp: %u", drv_data->t_sample);
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drv_data->rh_sample = get_humi(drv_data->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(struct device *dev, 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->driver_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 / 32 - 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 / 16 - 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(struct device *dev)
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{
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struct th02_data *drv_data = dev->driver_data;
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drv_data->i2c = device_get_binding(CONFIG_TH02_I2C_MASTER_DEV_NAME);
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if (drv_data->i2c == NULL) {
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LOG_ERR("Failed to get pointer to %s device!",
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CONFIG_TH02_I2C_MASTER_DEV_NAME);
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return -EINVAL;
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}
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return 0;
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}
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static struct th02_data th02_driver;
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DEVICE_AND_API_INIT(th02, CONFIG_TH02_NAME, th02_init, &th02_driver,
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NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY,
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&th02_driver_api);
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