53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/**@file cpu/stm32w108/hal/micro/cortexm3/temperature-sensor.c
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* @brief MB851 temperature sensor APIS
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*
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*
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* <!--(C) COPYRIGHT 2010 STMicroelectronics. All rights reserved. -->
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*/
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#include PLATFORM_HEADER
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#include BOARD_HEADER
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#include "hal/hal.h"
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#include "hal/error.h"
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#include "hal/micro/temperature-sensor.h"
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#include "hal/micro/adc.h"
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void temperatureSensor_Init(void)
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{
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/* Configure temperature sensor GPIO */
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halGpioConfig(TEMPERATURE_SENSOR_GPIO,GPIOCFG_ANALOG);
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/* Init ADC driver */
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halInternalInitAdc();
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/*
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NOTE:
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The ADC extended range is inaccurate due to the high voltage mode bug of the general purpose ADC
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(see STM32W108 errata). As consequence, it is not reccomended to use this ADC driver for getting
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the temperature values.
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*/
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#ifdef ENABLE_ADC_EXTENDED_RANGE_BROKEN
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halAdcSetRange(TRUE);
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#endif /* ENABLE_ADC_EXTENDED_RANGE_BROKEN */
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}/* end temperatureSensor_Init() */
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uint32_t temperatureSensor_GetValue(void)
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{
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static uint16_t ADCvalue;
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static int16_t volts;
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/*
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NOTE:
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The ADC extended range is inaccurate due to the high voltage mode bug of the general purpose ADC
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(see STM32W108 errata). As consequence, it is not reccomended to use this ADC driver for getting
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the temperature values.
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*/
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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 - (int32_t)volts)*100)/1171;
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}/* end temperatureSensor_GetValue() */
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