01a7a78a94
The conversion was made from an incorrect source when the GPIO pin was not PB7. Added functions and macros used to select the correct ADC channel.
115 lines
3.7 KiB
C
115 lines
3.7 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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* $Id: temperature-sensor.c,v 1.1 2010/10/25 09:03:39 salvopitru Exp $
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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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