86 lines
3.9 KiB
C
86 lines
3.9 KiB
C
/*
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* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup sensortag-cc26xx-peripherals
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* @{
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*
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* \defgroup sensortag-cc26xx-sht-sensor SensorTag 2.0 Humidity Sensor
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*
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* Due to the time required between triggering a reading and the reading
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* becoming available, this driver is meant to be used in an asynchronous
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* fashion. The caller must first activate the sensor by calling
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* SENSORS_ACTIVATE(). This will trigger a cycle which will read both
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* temperature and humidity, but the call will not wait for the cycle to
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* complete so that the CPU can perform other tasks or drop to a low power
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* mode.
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*
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* Once readings are available, the driver will generate a sensors_changed
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* event.
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*
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* Calls to .status() will return the driver's state which could indicate that
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* a measurement is in progress (different return values for each) or that
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* readings are ready.
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*
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* Multiple calls to value() will simply return the reading that was latched
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* after the last cycle. In order to obtain fresh readings, a new cycle must be
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* started by a new call to SENSORS_ACTIVATE.
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* @{
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*
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* \file
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* Header file for the Sensortag-CC26ss Sensirion SHT21 Humidity sensor
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*/
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/*---------------------------------------------------------------------------*/
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#ifndef SHT_21_SENSOR_H_
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#define SHT_21_SENSOR_H_
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/*---------------------------------------------------------------------------*/
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#define SHT_21_SENSOR_TYPE_TEMP 1
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#define SHT_21_SENSOR_TYPE_HUMIDITY 2
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/*---------------------------------------------------------------------------*/
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/**
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* \name SHT21 driver states
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* @{
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*/
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#define SHT_21_SENSOR_STATUS_DISABLED 0 /**< Not initialised */
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#define SHT_21_SENSOR_STATUS_INITIALISED 1 /**< Initialised but idle */
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#define SHT_21_SENSOR_STATUS_READING_TEMP 2 /**< Temp reading in progress */
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#define SHT_21_SENSOR_STATUS_READING_HUMIDITY 3 /**< Humidity reading in progress */
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#define SHT_21_SENSOR_STATUS_READINGS_READY 4 /**< Both readings ready */
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/** @} */
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/*---------------------------------------------------------------------------*/
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extern const struct sensors_sensor sht_21_sensor;
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/*---------------------------------------------------------------------------*/
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#endif /* SHT_21_SENSOR_H_ */
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/*---------------------------------------------------------------------------*/
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/**
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* @}
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* @}
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*/
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