170 lines
3.4 KiB
C
170 lines
3.4 KiB
C
/*
|
|
* Copyright (c) 2019 Electronut Labs
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT silabs_si7006
|
|
|
|
#include <drivers/sensor.h>
|
|
#include <kernel.h>
|
|
#include <device.h>
|
|
#include <init.h>
|
|
#include <string.h>
|
|
#include <sys/byteorder.h>
|
|
#include <sys/__assert.h>
|
|
#include <logging/log.h>
|
|
#include <drivers/i2c.h>
|
|
#include <logging/log.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include "si7006.h"
|
|
|
|
LOG_MODULE_REGISTER(si7006, CONFIG_SENSOR_LOG_LEVEL);
|
|
|
|
struct si7006_data {
|
|
const struct device *i2c_dev;
|
|
uint16_t temperature;
|
|
uint16_t humidity;
|
|
};
|
|
|
|
/**
|
|
* @brief function to get relative humidity
|
|
*
|
|
* @return int 0 on success
|
|
*/
|
|
static int si7006_get_humidity(const struct device *i2c_dev,
|
|
struct si7006_data *si_data)
|
|
{
|
|
int retval;
|
|
uint8_t hum[2];
|
|
|
|
retval = i2c_burst_read(i2c_dev, DT_INST_REG_ADDR(0),
|
|
SI7006_MEAS_REL_HUMIDITY_MASTER_MODE, hum, sizeof(hum));
|
|
|
|
if (retval == 0) {
|
|
si_data->humidity = (hum[0] << 8) | hum[1];
|
|
} else {
|
|
LOG_ERR("read register err");
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* @brief function to get temperature
|
|
*
|
|
* Note that si7006_get_humidity must be called before calling
|
|
* si7006_get_old_temperature.
|
|
*
|
|
* @return int 0 on success
|
|
*/
|
|
|
|
static int si7006_get_old_temperature(const struct device *i2c_dev,
|
|
struct si7006_data *si_data)
|
|
{
|
|
uint8_t temp[2];
|
|
int retval;
|
|
|
|
retval = i2c_burst_read(i2c_dev, DT_INST_REG_ADDR(0),
|
|
SI7006_READ_OLD_TEMP, temp, sizeof(temp));
|
|
|
|
if (retval == 0) {
|
|
si_data->temperature = (temp[0] << 8) | temp[1];
|
|
} else {
|
|
LOG_ERR("read register err");
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* @brief fetch a sample from the sensor
|
|
*
|
|
* @return 0
|
|
*/
|
|
static int si7006_sample_fetch(const struct device *dev,
|
|
enum sensor_channel chan)
|
|
{
|
|
int retval;
|
|
struct si7006_data *si_data = dev->data;
|
|
|
|
retval = si7006_get_humidity(si_data->i2c_dev, si_data);
|
|
if (retval == 0) {
|
|
retval = si7006_get_old_temperature(si_data->i2c_dev, si_data);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* @brief sensor value get
|
|
*
|
|
* @return -ENOTSUP for unsupported channels
|
|
*/
|
|
static int si7006_channel_get(const struct device *dev,
|
|
enum sensor_channel chan,
|
|
struct sensor_value *val)
|
|
{
|
|
struct si7006_data *si_data = dev->data;
|
|
|
|
if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
|
|
|
|
int32_t temp_ucelcius = (((17572 * (int32_t)si_data->temperature)
|
|
/ 65536) - 4685) * 10000;
|
|
|
|
val->val1 = temp_ucelcius / 1000000;
|
|
val->val2 = temp_ucelcius % 1000000;
|
|
|
|
LOG_DBG("temperature = val1:%d, val2:%d", val->val1, val->val2);
|
|
|
|
return 0;
|
|
} else if (chan == SENSOR_CHAN_HUMIDITY) {
|
|
|
|
int32_t relative_humidity = (((125 * (int32_t)si_data->humidity)
|
|
/ 65536) - 6) * 1000000;
|
|
|
|
val->val1 = relative_humidity / 1000000;
|
|
val->val2 = relative_humidity % 1000000;
|
|
|
|
LOG_DBG("humidity = val1:%d, val2:%d", val->val1, val->val2);
|
|
|
|
return 0;
|
|
} else {
|
|
return -ENOTSUP;
|
|
}
|
|
}
|
|
|
|
static const struct sensor_driver_api si7006_api = {
|
|
.sample_fetch = &si7006_sample_fetch,
|
|
.channel_get = &si7006_channel_get,
|
|
};
|
|
|
|
/**
|
|
* @brief initiasize the sensor
|
|
*
|
|
* @return 0 for success
|
|
*/
|
|
|
|
static int si7006_init(const struct device *dev)
|
|
{
|
|
struct si7006_data *drv_data = dev->data;
|
|
|
|
drv_data->i2c_dev = device_get_binding(
|
|
DT_INST_BUS_LABEL(0));
|
|
|
|
if (!drv_data->i2c_dev) {
|
|
LOG_ERR("i2c master not found.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
LOG_DBG("si7006 init ok");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct si7006_data si_data;
|
|
|
|
DEVICE_DT_INST_DEFINE(0, si7006_init, NULL,
|
|
&si_data, NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, &si7006_api);
|