osd-contiki/platform/zoul/dev/sht25.c

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/*
* Copyright (c) 2015, Zolertia <http://www.zolertia.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup zoul-sht25-sensor
* @{
*
* \file
* SHT25 temperature and humidity sensor driver
* \author
* Antonio Lignan <alinan@zolertia.com>
*/
/*---------------------------------------------------------------------------*/
#include <stdio.h>
#include "contiki.h"
#include "dev/i2c.h"
#include "dev/sht25.h"
#include "lib/sensors.h"
/*---------------------------------------------------------------------------*/
static uint8_t enabled;
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
if(type != SENSORS_ACTIVE) {
return SHT25_ERROR;
}
if(value) {
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i2c_init(I2C_SDA_PORT, I2C_SDA_PIN, I2C_SCL_PORT, I2C_SCL_PIN,
I2C_SCL_NORMAL_BUS_SPEED);
}
enabled = value;
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
switch(type) {
case SENSORS_ACTIVE:
case SENSORS_READY:
return enabled;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static uint16_t
sht25_read_reg(uint8_t reg, uint8_t *buf, uint8_t regNum)
{
if(i2c_single_send(SHT25_ADDR, reg) == I2C_MASTER_ERR_NONE) {
if(i2c_burst_receive(SHT25_ADDR, buf, regNum) == I2C_MASTER_ERR_NONE) {
return SHT25_SUCCESS;
}
}
return SHT25_ERROR;
}
/*---------------------------------------------------------------------------*/
static int16_t
sht25_convert(uint8_t variable, uint16_t value)
{
int16_t rd;
uint32_t buff;
buff = (uint32_t)value;
if(variable == SHT25_VAL_TEMP) {
buff *= 17572;
buff = buff >> 16;
rd = (int16_t)buff - 4685;
} else {
buff *= 12500;
buff = buff >> 16;
rd = (int16_t)buff - 600;
rd = (rd > 10000) ? 10000 : rd;
}
return rd;
}
/*---------------------------------------------------------------------------*/
static int16_t
sht25_read(uint8_t variable, uint16_t *rd)
{
uint8_t buf[2];
uint16_t raw;
if((variable != SHT25_VAL_TEMP) && (variable != SHT25_VAL_HUM)) {
return SHT25_ERROR;
}
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if(sht25_read_reg(variable, buf, 2) == SHT25_SUCCESS) {
raw = (buf[0] << 8) + buf[1];
*rd = sht25_convert(variable, raw);
return SHT25_SUCCESS;
}
return SHT25_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
uint16_t val;
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if(sht25_read(type, &val) == SHT25_SUCCESS) {
return val;
}
return SHT25_ERROR;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(sht25, SHT25_SENSOR, value, configure, status);
/*---------------------------------------------------------------------------*/
/** @} */