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99 lines
4.6 KiB
Plaintext
99 lines
4.6 KiB
Plaintext
/**
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@page ADC_InjectedConversion_Interrupt conversion using interrupt
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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 RegularConversion interrupt example.
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******************************************************************************
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*
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* Copyright (c) 2017 STMicroelectronics. All rights reserved.
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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 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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The ADC3 is configured to convert continuously regular ADC_CHANNEL_10
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and convert injected ADC_CHANNEL_12 (connected to PC.02) 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 callback function. After one second of
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the start of regular ADC_CHANNEL_10 conversion the injected ADC_CHANNEL_12 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
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converted injected data of ADC3 DR register is affected to the uhADCxConvertedInjValue
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variable in the ADC conversion complete callback function.
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Conversion time (reference manual, Reset and Clock control part):
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The function SystemClock_Config() configures the clock divider as follows:
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1) The system clock is 180 MHz.
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2) AHB Prescaler = 1 => AHB clock is 180 MHz.
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2) APB2 Prescaler = 2 => APB2 clock is 90 MHz.
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3) ADC Prescaler = 4 => ADC clock is 22.5 MHz.
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Sampling time is set to ADC_SAMPLETIME_56CYCLES (56 cycles).
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ConvTime = Sampling time + 12 cycles ADC conversion time + 3 cycles sampling time.
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= 71 clock cycles
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= 3.2 us
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User can vary the ADC_CHANNEL_10 voltage using the Eval Board potentiometer (RV1) connected to PC.0.
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The converted values could be monitered through a debugger:
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- uhADCxConvertedRegValue for regular conversion
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- uhADCxConvertedInjValue for injected conversion
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STM32 Eval board's LEDs can be used to monitor the transfer status:
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- LED3 is ON when there is an initialization error.
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@note The connection of the LCD reset pin to a dedicated GPIO PK7 instead of the STM32F469 NRST pin may cause residual display on LCD with applications/examples that do not require display.
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The LCD clear can be ensured by hardware through the board's power off/power on or by software calling the BSP_LCD_Reset() function.
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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 DMA interrupt handlers header file
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- ADC/ADC_InjectedConversion_Interrupt/Inc/main.h Header for main.c module
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- ADC/ADC_InjectedConversion_Interrupt/Src/stm32f4xx_it.c DMA 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 file
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- ADC/ADC_InjectedConversion_Interrupt/Src/system_stm32f4xx.c STM32F4xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F469xx/STM32F479xx devices.
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- This example has been tested and validated with STM32469I-EVAL RevC board and can be
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easily tailored to any other supported device and development board.
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- STM32469I-EVAL RevC Set-up
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- Use the Potentiometer (RV1) of the Eval board (connected to PC.0).
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- Connect PC.02 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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- Make sure that JP3 is fitted in 2-3 positions to use potentiometer.
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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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