104 lines
4.6 KiB
Plaintext
104 lines
4.6 KiB
Plaintext
/**
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@page ADC_MultiChannelSingleConversion ADC example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file Examples_LL/ADC/ADC_MultiChannelSingleConversion/readme.txt
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* @author MCD Application Team
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* @brief Description of the ADC_MultiChannelSingleConversion example.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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How to use an ADC peripheral to convert several channels. ADC conversions are
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performed successively in a scan sequence.
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This example is based on the STM32F1xx ADC LL API.
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The peripheral initialization is done using LL unitary service functions
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for optimization purposes (performance and size).
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Example configuration:
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ADC is configured in single conversion mode, from SW trigger.
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Sequencer of group regular (default group available on ADC of all STM32 devices)
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is configured to convert 3 channels: 1 channel from GPIO, 2 internal channels:
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temperature sensor and VrefInt.
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DMA is configured to transfer conversion data in an array of size three (one array
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address for conversion data of each channel), in circular mode to update
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results array at each ADC sequence conversions.
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Example execution:
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At each press on User Button, the ADC executes the scan sequence:
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ADC performs conversion of the three selected channels successively,
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in burst (discontinuous mode not enabled).
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The 3 ADC conversions data are transferred by DMA into the results array
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"aADCxConvertedData".
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ADC conversion data of each sequence rank is at an address of the array:
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- aADCxConvertedData[0]: ADC channel set on rank1 (GPIO as analog input)
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- aADCxConvertedData[1]: ADC channel set on rank2 (VrefInt)
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- aADCxConvertedData[2]: ADC channel set on rank3 (Temperature sensor)
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LED2 is turned on when ADC conversions and DMA transfer of the sequence
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are completed.
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ADC conversions raw data are computed to physical values
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using LL ADC driver helper macro:
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- Value of voltage on GPIO pin (on which is mapped ADC channel) (unit: mV)
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- Value of internal voltage reference VrefInt (unit: mV)
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- Value of temperature (unit: degree Celcius)
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- Value of analog reference voltage (Vref+), connected to analog voltage supply Vdda (unit: mV)
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For debug: variables to monitor with debugger watch window:
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- "aADCxConvertedData": ADC group regular conversion data
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- "ubDmaTransferStatus": status of DMA transfer of ADC group regular conversions
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- "uhADCxConvertedData_VoltageGPIO_mVolt": Value of voltage on GPIO pin (on which is mapped ADC channel) (unit: mV)
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- "uhADCxConvertedData_VrefInt_mVolt": Value of internal voltage reference VrefInt (unit: mV)
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- "hADCxConvertedData_Temperature_DegreeCelsius": Value of temperature (unit: degree Celcius)
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Connection needed:
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Use an external power supply, adjust supply voltage and connect it to analog input pin (cf pin below).
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Other peripherals used:
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1 GPIO for User Button
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1 GPIO for LED2
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1 GPIO for analog input: PA.04 (Arduino connector CN8 pin A2, Morpho connector CN7 pin 32)
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DMA
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@par Directory contents
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- ADC/ADC_MultiChannelSingleConversion/Inc/stm32f1xx_it.h Interrupt handlers header file
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- ADC/ADC_MultiChannelSingleConversion/Inc/main.h Header for main.c module
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- ADC/ADC_MultiChannelSingleConversion/Inc/stm32_assert.h Template file to include assert_failed function
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- ADC/ADC_MultiChannelSingleConversion/Src/stm32f1xx_it.c Interrupt handlers
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- ADC/ADC_MultiChannelSingleConversion/Src/main.c Main program
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- ADC/ADC_MultiChannelSingleConversion/Src/system_stm32f1xx.c STM32F1xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F103xB devices.
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- This example has been tested with STM32F103RB-Nucleo 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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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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