contiki/platform/mb851/dev/temperature-sensor.c
Adam Dunkels a5046e83c7 Cleanup and refactoring of the STM32w port
This is a general cleanup of things like code style issues and code structure of the STM32w port to make it more like the rest of Contiki is structured.
2013-03-18 13:31:26 +01:00

111 lines
3.4 KiB
C

/**
* \addtogroup mb851-platform
*
* @{
*/
/*
* Copyright (c) 2010, STMicroelectronics.
* 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. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
*/
/**
* \file
* Temperature sensor.
* \author
* Salvatore Pitrulli <salvopitru@users.sourceforge.net>
*/
#include PLATFORM_HEADER
#include BOARD_HEADER
#include "hal/error.h"
#include "hal/hal.h"
#include "micro/adc.h"
#include "dev/temperature-sensor.h"
#undef TEMPERATURE_SENSOR_GPIO
#define TEMPERATURE_SENSOR_GPIO PORTB_PIN(7)
/*---------------------------------------------------------------------------*/
static void
init(void)
{
halGpioConfig(TEMPERATURE_SENSOR_GPIO, GPIOCFG_ANALOG);
halInternalInitAdc();
halAdcSetRange(TRUE);
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
static uint16_t ADCvalue;
static int16_t volts;
halStartAdcConversion(ADC_USER_APP, ADC_REF_INT, ADC_SOURCE_ADC2_VREF2,
ADC_CONVERSION_TIME_US_4096);
/* This blocks for a while, about 4ms. */
halReadAdcBlocking(ADC_USER_APP, &ADCvalue);
/* 100 uVolts */
volts = halConvertValueToVolts(ADCvalue);
/* +- 0.23 degC in the range (-10;65) degC */
/* return ((18641 - (int32_t)volts)*100)/1171;*/
/* +- 0.004 degC in the range (20;30) degC */
return ((18663 - (int32_t) volts) * 100) / 1169;
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
switch (type) {
case SENSORS_HW_INIT:
init();
return 1;
case SENSORS_ACTIVE:
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
switch (type) {
case SENSORS_READY:
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(temperature_sensor, TEMPERATURE_SENSOR,
value, configure, status);
/*--------------------------------------------------------------------------*/
/** @} */