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/*
HDC1000 for ChibiOS/RT - Copyright (C) 2016 Stephane D'Alu
*/
/**
* @file hdc1000.h
* @brief HDC1000 Temperature/Humidiry sensor interface module header.
*
* When changing sensor settings, you generally need to wait
* for 2 * getAquisitionTime(), as usually the first acquisition
* will be corrupted by the change of settings.
*
* No locking is done.
*
* @{
*/
#ifndef _SENSOR_HDC1000_H_
#define _SENSOR_HDC1000_H_
#include <math.h>
#include <stdbool.h>
#include "i2c_helpers.h"
#include "sensor.h"
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
#define HDC1000_CONTINUOUS_ACQUISITION_SUPPORTED FALSE
/* I2C address */
#define HDC1000_I2CADDR_1 0x40
#define HDC1000_I2CADDR_2 0x41
#define HDC1000_I2CADDR_3 0x42
#define HDC1000_I2CADDR_4 0x43
#define HDC1000_SERIAL_SIZE 5 /**< @brief Size of serial (40bits) */
/**
* @brief Time necessary for the sensor to boot
*/
#define HDC1000_BOOTUP_TIME 15
/**
* @brief Time necessary for the sensor to start
*/
#define HDC1000_STARTUP_TIME 0
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#define HDC1000_I2CADDR_DEFAULT HDC1000_I2CADDR_1
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief HDC1000 configuration structure.
*/
typedef struct {
I2CHelper i2c; /* keep it first */
} HDC1000_config;
/**
* @brief HDC1000 configuration structure.
*/
typedef struct {
HDC1000_config *config;
sensor_state_t state;
unsigned int delay;
uint16_t cfg;
} HDC1000_drv;
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
/**
* @brief Initialize the sensor driver
*/
void
HDC1000_init(HDC1000_drv *drv,
HDC1000_config *config);
/**
* @brief Start the sensor
*/
msg_t
HDC1000_start(HDC1000_drv *drv);
/**
* @brief Stop the sensor
*
* @details If the sensor support it, it will be put in low energy mode.
*/
msg_t
HDC1000_stop(HDC1000_drv *drv);
/**
* @brief Check that the sensor is really present
*/
msg_t
HDC1000_check(HDC1000_drv *drv);
msg_t
HDC1000_readSerial(HDC1000_drv *drv, uint8_t *serial);
/**
* @brief Control the HD1000 heater.
*/
msg_t
HDC1000_setHeater(HDC1000_drv *drv,
bool on);
/**
* @brief Time in milli-seconds necessary for acquiring a naw measure
*
* @returns
* unsigned int time in millis-seconds
*/
static inline unsigned int
HDC1000_getAcquisitionTime(HDC1000_drv *drv) {
return drv->delay;
}
/**
* @brief Trigger a mesure acquisition
*/
msg_t
HDC1000_startMeasure(HDC1000_drv *drv);
/**
* @brief Read the newly acquiered measure
*
* @note According the the sensor design the measure read
* can be any value acquired after the acquisition time
* and the call to readMeasure.
*/
msg_t
HDC1000_readMeasure(HDC1000_drv *drv,
float *temperature, float *humidity);
/**
* @brief Read temperature and humidity
*
* @details According to the sensor specification/configuration
* (see #HDC1000_CONTINUOUS_ACQUISITION_SUPPORTED),
* if the sensor is doing continuous measurement
* it's value will be requested and returned immediately.
* Otherwise a measure is started, the necessary amount of
* time for acquiring the value is spend sleeping (not spinning),
* and finally the measure is read.
*
* @note In continuous measurement mode, if you just started
* the sensor, you will need to wait getAcquisitionTime()
* in addition to the usual #HDC1000_STARTUP_TIME
* @note If using several sensors, it is better to start all the
* measure together, wait for the sensor having the longuest
* aquisition time, and finally read all the values
*/
msg_t
HDC1000_readTemperatureHumidity(HDC1000_drv *drv,
float *temperature, float *humidity);
/**
* @brief Return the humidity value in percent.
*
* @details Use readTemperatureHumidity() for returning the humidity value.
*
* @note Prefere readTemperatureHumidity(), if you need both temperature
* and humidity, or if you need better error handling.
*
* @returns
* float humidity percent
* NAN on failure
*/
static inline float
HDC1000_getHumidity(HDC1000_drv *drv) {
float humidity = NAN;
HDC1000_readTemperatureHumidity(drv, NULL, &humidity);
return humidity;
}
/**
* @brief Return the temperature value in °C.
*
* @details Use readTemperatureHumidity() for returning the humidity value.
*
* @note Prefere readTemperatureHumidity(), if you need both temperature
* and humidity, or if you need better error handling.
*
* @returns
* float humidity percent
* NAN on failure
*/
static inline float
HDC1000_getTemperature(HDC1000_drv *drv) {
float temperature = NAN;
HDC1000_readTemperatureHumidity(drv, &temperature, NULL);
return temperature;
}
#endif
/**
* @}
*/
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