91 lines
4.0 KiB
Plaintext
91 lines
4.0 KiB
Plaintext
/**
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@page ADC_TemperatureSensor conversion using the internal Temperature Sensor
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@verbatim
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******************************************************************************
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* @file ADC/ADC_TemperatureSensor/readme.txt
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* @author MCD Application Team
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* @brief Description of the ADC Temperature Sensor example.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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This example describes how to use the ADC1 and the Temperature Sensor to calculate
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the junction temperature of the device.
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The ADC1 is configured to continuously convert ADC_CHANNEL_TEMPSENSOR.
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Each time an end of conversion occurs the DMA transfers, in circular mode, the
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converted data from ADC1 DR register to the ConvertedValue variable.
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The ConvertedValue read value is coded on 12 bits.
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The Junction Temperature of the device is calculated via the formula:
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JTemp = ((Vsens - V25)/Avg_Slope) + 25°C
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- Vsens = ConvertedValue * (Vref+ - Vref-) / (2^12 - 1) = ConvertedValue * 3.3 / 4095
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- V25 = 760 mV
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- Avg_Slope = 2.5 mV/C°
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The calculated temperature is stored in the JTemp variable. The value is displayed
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on the LCD and refreshed each 1s.
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The internal temperature sensor supports a temperature range of –40 to 125°C with
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an accuracy of +/-1.5°C.
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STM32F769I-Discovery board's LEDs can be used to monitor the transfer status:
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- LED1 (Red LED) blinks when error occurs during initialization.
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- LED2 (Green LED) toggles each 1s when the ADC is converting.
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@par Keywords
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Analog, ADC, Temperature Sensor, Single Conversion, Polling, Software trigger, Signal measurement,
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@Note If the user code size exceeds the DTCM-RAM size or starts from internal cacheable memories (SRAM1 and SRAM2),that is shared between several processors,
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then it is highly recommended to enable the CPU cache and maintain its coherence at application level.
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The address and the size of cacheable buffers (shared between CPU and other masters) must be properly updated to be aligned to cache line size (32 bytes).
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@Note It is recommended to enable the cache and maintain its coherence, but depending on the use case
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It is also possible to configure the MPU as "Write through", to guarantee the write access coherence.
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In that case, the MPU must be configured as Cacheable/Bufferable/Not Shareable.
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Even though the user must manage the cache coherence for read accesses.
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Please refer to the AN4838 “Managing memory protection unit (MPU) in STM32 MCUs”
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Please refer to the AN4839 “Level 1 cache on STM32F7 Series”
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@par Directory contents
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- ADC/ADC_TemperatureSensor/Inc/stm32f7xx_hal_conf.h HAL configuration file
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- ADC/ADC_TemperatureSensor/Inc/stm32f7xx_it.h DMA interrupt handlers header file
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- ADC/ADC_TemperatureSensor/Inc/main.h Header for main.c module
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- ADC/ADC_TemperatureSensor/Src/stm32f7xx_it.c DMA interrupt handlers
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- ADC/ADC_TemperatureSensor/Src/main.c Main program
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- ADC/ADC_TemperatureSensor/Src/stm32f7xx_hal_msp.c HAL MSP file
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- ADC/ADC_TemperatureSensor/Src/system_stm32f7xx.c STM32F7xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F767xx/STM32F769xx/STM32F777xx/STM32F779xx devices.
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- This example has been tested with STM32F769I-DISCOVERY board and can be
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easily tailored to any other supported device and development board.
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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*/
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