98 lines
4.5 KiB
Plaintext
98 lines
4.5 KiB
Plaintext
/**
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@page ADC_InjectedConversion_Interrupt ADC3 conversion using Interrupt example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file ADC/ADC_InjectedConversion_Interrupt/readme.txt
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* @author MCD Application Team
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* @brief Description of the ADC Injected Conversion Interrupt example.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 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 interrupt continuous ADC regular channel conversion using ADC injected
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channels, and how to get the result of this conversion.
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This example describes how to interrupt continuous ADC3 regular channel7 conversion
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using ADC3 injected channel12 and how to get the converted value of this conversion.
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The ADC3 is configured to convert continuously regular channel7(for STM324xG-EVAL)
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and convert injected channel12 (connected to PC.2) when injected conversion starts
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(after one second of the start of regular channel).
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Each time a regular channel end of conversion occurs an interrupt is generated
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and the converted data of ADC3 DR register is affected to the uhADCxConvertedRegValue
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variable in the ADC conversion complete call back function. After one second of
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the start of regular channel8 conversion the injected channel12 conversion starts
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so regular conversion is temporary interrupted until the end of injected conversion,
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when the injected conversion is finished an interrupt is generated and the converted injected
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data of ADC3 DR register is affected to the uhADCxConvertedInjValue variable
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in the ADC conversion complete call back function.
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The user can use the debugger's watch to evaluate uhADCxConvertedRegValue and uhADCxConvertedInjValue
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In this example, the system clock is 144MHz, APB2 = 72MHz and ADC clock = APB2/2.
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Since ADC3 clock is 36 MHz and sampling time is set to 3 cycles, the conversion
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time to 12bit data is 12 cycles so the total conversion time is (12+3)/36= 0.41us(2.4Msps).
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STM32 Eval boards LEDs can be used to monitor the transfer status:
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- LED3 is ON when there are an error in initialization.
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@par Keywords
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Analog, ADC, Analog to Digital, Injected mode, Continuous conversion, Interrupt, Measurement,
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@par Directory contents
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- ADC/ADC_InjectedConversion_Interrupt/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- ADC/ADC_InjectedConversion_Interrupt/Inc/stm32f4xx_it.h Interrupt handlers header file
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- ADC/ADC_InjectedConversion_Interrupt/Inc/main.h Main program header file
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- ADC/ADC_InjectedConversion_Interrupt/Src/stm32f4xx_it.c Interrupt handlers
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- ADC/ADC_InjectedConversion_Interrupt/Src/main.c Main program
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- ADC/ADC_InjectedConversion_Interrupt/Src/stm32f4xx_hal_msp.c HAL MSP module
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- ADC/ADC_InjectedConversion_Interrupt/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
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@par Hardware and Software environment
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- This example runs on STM32F407xx/417xx devices.
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- This example has been tested with STM324xG-EVAL RevC evaluation board and can be
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easily tailored to any other supported device and development board.
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- STM324xG-EVAL RevC Set-up
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- Use the Potentiometer (RV1) of the Eval board (connected to PF.09).
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- Connect PC.2 to a power supply (do not forget to connect the power supply
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GND to the EVAL board GND)
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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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