113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
/*
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* Copyright (c) 2010, STMicroelectronics.
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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
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the Contiki OS
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*
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \file
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* Temperature sensor.
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* \author
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* Salvatore Pitrulli <salvopitru@users.sourceforge.net>
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* NOTE:
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* For the temperature measurement, the ADC extended range mode is needed;
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* but this is inaccurate due to the high voltage mode bug of the general purpose ADC
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* (see STM32W108 errata).
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*/
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#include PLATFORM_HEADER
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#include BOARD_HEADER
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#include "hal/error.h"
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#include "hal/hal.h"
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#include "micro/adc.h"
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#include "dev/temperature-sensor.h"
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/*---------------------------------------------------------------------------*/
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static void
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init(void)
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{
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halGpioConfig(TEMPERATURE_SENSOR_GPIO,GPIOCFG_ANALOG);
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halInternalInitAdc();
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halAdcSetRange(TRUE);
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}
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/*---------------------------------------------------------------------------*/
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static int
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value(int type)
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{
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static int16u ADCvalue;
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static int16s volts;
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halStartAdcConversion(ADC_USER_APP, ADC_REF_INT, ADC_SOURCE(halGetADCChannelFromGPIO(TEMPERATURE_SENSOR_GPIO),ADC_MUX_VREF2), ADC_CONVERSION_TIME_US_4096);
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halReadAdcBlocking(ADC_USER_APP, &ADCvalue); // This blocks for a while, about 4ms.
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// 100 uVolts
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volts = halConvertValueToVolts(ADCvalue);
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//return ((18641 - (int32s)volts)*100)/1171; // +- 0.23 degC in the range (-10;65) degC
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return ((18663 - (int32s)volts)*100)/1169; // +- 0.004 degC in the range (20;30) degC
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int value)
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{
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switch(type){
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case SENSORS_HW_INIT:
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init();
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return 1;
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case SENSORS_ACTIVE:
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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status(int type)
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{
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switch(type) {
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case SENSORS_READY:
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(temperature_sensor, TEMPERATURE_SENSOR,
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value, configure, status);
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