nes-proj/cpu/cc2538/dev/cc2538-temp-sensor.c

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2015-02-11 16:54:25 +00:00
/*
* Copyright (c) 2015, Zolertia - http://www.zolertia.com
* Copyright (c) 2015, University of Bristol - http://www.bristol.ac.uk
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup cc2538-temp-sensor
* @{
*
* \file
* Driver for the CC2538 On-Chip temperature sensor
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "lib/sensors.h"
#include "dev/adc.h"
#include "dev/cc2538-sensors.h"
#include <stdint.h>
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
int raw = adc_get(SOC_ADC_ADCCON_CH_TEMP, SOC_ADC_ADCCON_REF_INT,
SOC_ADC_ADCCON_DIV_512);
if(type == CC2538_SENSORS_VALUE_TYPE_RAW) {
return raw;
} else if(type == CC2538_SENSORS_VALUE_TYPE_CONVERTED) {
return 25000 + ((raw >> 4) - 1422) * 10000 / 42;
}
return CC2538_SENSORS_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
return 1;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(cc2538_temp_sensor, TEMP_SENSOR, value, configure, status);
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/*---------------------------------------------------------------------------*/
/** @} */