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101 lines
4.3 KiB
Plaintext
101 lines
4.3 KiB
Plaintext
/**
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@page ADC_SingleConversion_TriggerSW ADC example
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@verbatim
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******************************************************************************
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* @file Examples_LL/ADC/ADC_SingleConversion_TriggerSW/readme.txt
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* @author MCD Application Team
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* @brief Description of the ADC_SingleConversion_TriggerSW 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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How to use an ADC peripheral to perform a single ADC conversion on a channel
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at each software start. This example uses the polling programming model (for
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interrupt or DMA programming models, please refer to other examples).
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This example is based on the STM32F7xx ADC LL API;
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peripheral initialization done using LL unitary services functions
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for optimization purpose (performance and size).
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Example configuration:
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ADC is configured to convert a single channel, in single conversion mode,
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from SW trigger.
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Example execution:
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At each press on push button, the ADC performs 1 conversion of the selected channel.
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Software polls for conversion completion.
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When conversion is completed, main program reads conversion data
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from ADC data register and stores it into a variable, LED1 is turned on.
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For debug: variables to monitor with debugger watch window:
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- "uhADCxConvertedData": ADC group regular conversion data
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- "uhADCxConvertedData_Voltage_mVolt": ADC conversion data computation to physical values
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Connection needed:
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None.
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Note: Optionally, a voltage can be supplied to the analog input pin (cf pin below),
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between 0V and Vdda=3.3V, to perform a ADC conversion on a determined
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voltage level.
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Otherwise, this pin can be let floating (in this case ADC conversion data
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will be undetermined).
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Other peripherals used:
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1 GPIO for push button
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1 GPIO for LED1
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1 GPIO for analog input: PA.04 (connector CN7 pin 17)
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@par Keywords
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Analog, ADC, Analog to Digital, single conversion, Software trigger, Polling
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@Note<74>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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<20><><EFBFBD><EFBFBD><EFBFBD>then it is highly recommended to enable the CPU cache and maintain its coherence at application level.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>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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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> It is also possible to configure the MPU as "Write through", to guarantee the write access coherence.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>In that case, the MPU must be configured as Cacheable/Bufferable/Not Shareable.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Even though the user must manage the cache coherence for read accesses.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Please refer to the AN4838 <20>Managing memory protection unit (MPU) in STM32 MCUs<55>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Please refer to the AN4839 <20>Level 1 cache on STM32F7 Series<65>
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@par Directory contents
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- ADC/ADC_SingleConversion_TriggerSW/Inc/stm32f7xx_it.h Interrupt handlers header file
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- ADC/ADC_SingleConversion_TriggerSW/Inc/main.h Header for main.c module
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- ADC/ADC_SingleConversion_TriggerSW/Inc/stm32_assert.h Template file to include assert_failed function
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- ADC/ADC_SingleConversion_TriggerSW/Src/stm32f7xx_it.c Interrupt handlers
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- ADC/ADC_SingleConversion_TriggerSW/Src/main.c Main program
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- ADC/ADC_SingleConversion_TriggerSW/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 devices.
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- This example has been tested with NUCLEO-F767ZI 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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