106 lines
4.3 KiB
Plaintext
106 lines
4.3 KiB
Plaintext
/**
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@page ADC_GroupsRegularInjected ADC example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file Examples_LL/ADC/ADC_GroupsRegularInjected/readme.txt
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* @author MCD Application Team
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* @brief Description of the ADC_GroupsRegularInjected 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 with both ADC groups (regular and injected)
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in their intended use cases.
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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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Description of ADC group regular and group injected intended use case:
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- group regular for a high number of conversions and continuous
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data stream, with DMA transfer capability.
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- group injected for punctual conversions inserted between
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conversions of group regular.
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Example configuration:
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ADC is configured to use the 2 groups:
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- ADC group regular:
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ADC is configured to convert a single channel (1 channel from a GPIO),
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in single conversion mode, from HW trigger: timer peripheral .
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- ADC group injected:
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ADC is configured to convert a single channel (1 internal channel: VrefInt),
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in single conversion mode, from SW trigger.
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Other peripherals are configured to be used with ADC group regular:
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DMA is configured to transfer conversion data in an array (DMA transfer can be used
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only with ADC group regular).
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A timer is configured in time base and to generate TRGO events (trig from
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timer can be used with both ADC groups regular and injected).
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Example execution:
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From the main program execution, the ADC group regular converts the selected channel
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at each trig from timer.
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DMA transfers conversion data to the array, DMA transfer complete interruption occurs.
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Results array is updated indefinitely (DMA in circular mode).
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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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- "uhADCxGrpInjectedConvertedData": ADC group injected conversion data
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- "ubDmaTransferStatus": status of DMA transfer of ADC group regular conversions
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- "ubAdcGrpInjectedUnitaryConvStatus": status of ADC group injected unitary conversion
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From the first press on User Button, the ADC group injected converts the selected channel
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from a SW conversion start command.
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ADC group injected conversion complete interruption occurs, SW transfers
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conversion data to a variable, LED2 is turned on.
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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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Timer
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@par Directory contents
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- ADC/ADC_GroupsRegularInjected/Inc/stm32f1xx_it.h Interrupt handlers header file
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- ADC/ADC_GroupsRegularInjected/Inc/main.h Header for main.c module
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- ADC/ADC_GroupsRegularInjected/Inc/stm32_assert.h Template file to include assert_failed function
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- ADC/ADC_GroupsRegularInjected/Src/stm32f1xx_it.c Interrupt handlers
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- ADC/ADC_GroupsRegularInjected/Src/main.c Main program
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- ADC/ADC_GroupsRegularInjected/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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