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/*
* Copyright 2009, Freie Universitaet Berlin (FUB). All rights reserved.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
#ifndef SHT11_H_
#define SHT11_H_
/**
* @defgroup drivers_sht11 SHT11
* @ingroup drivers_sensors
* @brief Driver for Sensirion SHT11 Humidity and Temperature Sensor
* @{
*
* @file
* @brief SHT11 Device Driver
*
* @author Freie Universität Berlin, Computer Systems & Telematics
*/
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#define SHT11_NO_ACK (0)
#define SHT11_ACK (1)
//adr command r/w
#define SHT11_STATUS_REG_W (0x06) //000 0011 0
#define SHT11_STATUS_REG_R (0x07) //000 0011 1
#define SHT11_MEASURE_TEMP (0x03) //000 0001 1
#define SHT11_MEASURE_HUMI (0x05) //000 0010 1
#define SHT11_RESET (0x1E) //000 1111 0
/* time to wait after toggling the data line */
#define SHT11_DATA_WAIT (1)
/* time to wait after toggling the clock line */
#define SHT11_CLK_WAIT (1)
/* set measurement timeout to 1 second */
#define SHT11_MEASURE_TIMEOUT (1000)
/**
* @brief sht11 measureable data
*/
typedef struct {
float temperature; /**< temperature value */
float relhum; /**< linear relative humidity */
float relhum_temp; /**< temperature compensated relative humidity */
} sht11_val_t;
/**
* @brief SHT11 modes that can be measured
*/
typedef enum {
TEMPERATURE = 1,
HUMIDITY = 2
} sht11_mode_t;
/**
* @brief Initialize SHT11 ports
*/
void sht11_init(void);
/**
* @brief Read sensor
*
* @param value The struct to be filled with measured values
* @param mode Specifies type of data to be read
*
* @return 1 on success, 0 otherwise
*
* Example:
* \code sht11_val sht11;
* sht11_read_sensor(&sht11, HUMIDITY|TEMPERATURE);
* printf("%-6.2f °C %5.2f %% %5.2f %%\n", sht11.temperature, sht11.relhum, sht11.relhum_temp); \endcode
*/
uint8_t sht11_read_sensor(sht11_val_t *value, sht11_mode_t mode);
/**
* @brief Write status register
*
* @param p_value The value to write
*
* @return 1 on success, 0 otherwise
*/
uint8_t sht11_write_status(uint8_t *p_value);
/**
* @brief Read status register with checksum
*
* @param p_value The read value
* @param p_checksum The received checksum
*
* return 1 on success, 0 otherwise
*/
uint8_t sht11_read_status(uint8_t *p_value, uint8_t *p_checksum);
#ifdef __cplusplus
}
#endif
/** @} */
#endif /*SHT11_H_*/
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