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//*****************************************************************************
//
// hw_sht21.h - Macros used for accessing the Intersil SHT21 humidity sensor
//
// Copyright (c) 2013-2014 Texas Instruments Incorporated. All rights reserved.
// Software License Agreement
//
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
//
// This is part of revision 2.1.0.12573 of the Tiva Firmware Development Package.
//
//*****************************************************************************
#ifndef __SENSORLIB_HW_SHT21_H__
#define __SENSORLIB_HW_SHT21_H__
//*****************************************************************************
//
// The following are defines for the SHT21 Commands and Registers
//
//*****************************************************************************
#define SHT21_CMD_MEAS_T_HOLD 0xE3 // Measure temperatue with I2C bus
// hold
#define SHT21_CMD_MEAS_RH_HOLD 0xE5 // Measure humidity with I2C bus
// hold
#define SHT21_CMD_WRITE_CONFIG 0xE6 // Write the user config register
#define SHT21_CMD_READ_CONFIG 0xE7 // Read the user config register
#define SHT21_CMD_MEAS_T 0xF3 // Measure temperature polled
#define SHT21_CMD_MEAS_RH 0xF5 // Measure humidity polled
#define SHT21_CMD_SOFT_RESET 0xFE // Perform a device reset
//*****************************************************************************
//
// The following are defines for the bit fields in the SHT21_CONFIG register.
//
//*****************************************************************************
#define SHT21_CONFIG_RES_M 0x81 // Resolution config for
// temperature and humidity
#define SHT21_CONFIG_RES_12 0x00 // RH 12 bit, T 14 bit
#define SHT21_CONFIG_RES_8 0x01 // RH 8 bit, T 12 bit
#define SHT21_CONFIG_RES_10 0x80 // RH 10 bit, T 13 bit
#define SHT21_CONFIG_RES_11 0x81 // RH 11 bit, T 11 bit
#define SHT21_CONFIG_BATT_M 0x40 // Battery status indicator
#define SHT21_CONFIG_BATT_GOOD 0x00
#define SHT21_CONFIG_BATT_LOW 0x40
#define SHT21_CONFIG_HEATER_M 0x04 // On chip heater for test and
// diagnostics
#define SHT21_CONFIG_HEATER_DISABLE \
0x00 // Heater off
#define SHT21_CONFIG_HEATER_ENABLE \
0x04 // Heater on
#define SHT21_CONFIG_OTP_RELOAD_M \
0x02 // OTP reload control; soft reset
// is preferred
#define SHT21_CONFIG_OTP_RELOAD_ENABLE \
0x00 // OTP reload enabled
#define SHT21_CONFIG_OTP_RELOAD_DISABLE \
0x02 // OTP reload disabled
#define SHT21_CONFIG_BATT_S 6
#define SHT21_CONFIG_HEATER_S 2
#define SHT21_CONFIG_OTP_RELOAD_S \
1
#define SHT21_CONFIG_RES_S 0
#endif // __SENSORLIB_HW_SHT21_H__
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