139 lines
4.5 KiB
C
139 lines
4.5 KiB
C
/*
|
|
* 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 remote-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"
|
|
/*---------------------------------------------------------------------------*/
|
|
#warning I2C SDA AND SCL are inverted in JP8 connector, inverted in init() call
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint8_t enabled;
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
configure(int type, int value)
|
|
{
|
|
if(type != SENSORS_ACTIVE) {
|
|
return SHT25_ERROR;
|
|
}
|
|
if(value) {
|
|
i2c_init(I2C_SCL_PORT, I2C_SCL_PIN, I2C_SDA_PORT, I2C_SDA_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;
|
|
}
|
|
|
|
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;
|
|
if (sht25_read(type, &val) == SHT25_SUCCESS){
|
|
return val;
|
|
}
|
|
return SHT25_ERROR;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
SENSORS_SENSOR(sht25, SHT25_SENSOR, value, configure, status);
|
|
/*---------------------------------------------------------------------------*/
|
|
/** @} */
|