cc2538-temp-sensor.c

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/*
 * 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);
/*---------------------------------------------------------------------------*/
/** @} */