114 lines
4.3 KiB
C
114 lines
4.3 KiB
C
/*
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* Copyright (c) 2016, Zolertia - http://www.zolertia.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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup zoul-sensors
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* @{
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*
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* \defgroup zoul-dht22 DHT22 temperature and humidity sensor
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*
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* Driver for the DHT22 temperature and humidity sensor
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* @{
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*
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* \file
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* Header file for the DHT22 temperature and humidity sensor
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*/
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/*---------------------------------------------------------------------------*/
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#include "lib/sensors.h"
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/*---------------------------------------------------------------------------*/
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#ifndef DHT22_H_
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#define DHT22_H_
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/* -------------------------------------------------------------------------- */
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/**
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* \name DHT22 default pin and port
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* @{
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*/
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#ifdef DHT22_CONF_PIN
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#define DHT22_PIN DHT22_CONF_PIN
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#else
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#define DHT22_PIN 5
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#endif
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#ifdef DHT22_CONF_PORT
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#define DHT22_PORT DHT22_CONF_PORT
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#else
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#define DHT22_PORT GPIO_A_NUM
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#endif
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/** @} */
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/* -------------------------------------------------------------------------- */
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/**
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* \name DHT22 available commands
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* @{
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*/
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#define DHT22_READ_TEMP 0x01
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#define DHT22_READ_HUM 0x02
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#define DHT22_READ_ALL 0x03
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/** @} */
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/* -------------------------------------------------------------------------- */
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/**
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* \name DHT22 return types
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* @{
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*/
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#define DHT22_ERROR (-1)
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#define DHT22_SUCCESS 0x00
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#define DHT22_BUSY 0xFF
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/** @} */
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/* -------------------------------------------------------------------------- */
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/**
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* \name DHT22 constants
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* @{
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*/
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#define DHT22_BUFFER 5 /**< Buffer to store the samples */
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#define DHT22_COUNT 8 /**< Minimum ticks to detect a "1" bit */
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#define DHT22_MAX_TIMMING 85 /**< Maximum ticks in a single operation */
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#define DHT22_READING_DELAY 1 /**< 1 us */
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#define DHT22_READY_TIME 20 /**< 40 us */
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#define DHT22_START_TIME (RTIMER_SECOND / 50) /**< 20 ms */
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#define DHT22_AWAKE_TIME (RTIMER_SECOND / 4) /**< 250 ms */
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/** @} */
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/* -------------------------------------------------------------------------- */
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/**
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* \name DHT22 auxiliary functions
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* @{
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*/
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int dht22_read_all(int *temperature, int *humidity);
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/** @} */
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/* -------------------------------------------------------------------------- */
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#define DHT22_SENSOR "DHT22 sensor"
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/* -------------------------------------------------------------------------- */
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extern const struct sensors_sensor dht22;
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/* -------------------------------------------------------------------------- */
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#endif /* DHT22_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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