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100 lines
4.2 KiB
Plaintext
100 lines
4.2 KiB
Plaintext
/**
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@page ADC_DualModeInterleaved ADC1 and ADC2 in Dual interleaved mode and DMA mode3 example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file ADC/ADC_DualModeInterleaved/readme.txt
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* @author MCD Application Team
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* @brief Description of the Dual interleaved mode and DMA mode3 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 use two ADC peripherals to perform conversions in dual interleaved mode.
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This example provides a short description of how to use the ADC peripheral to
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convert a regular channel in Dual interleaved mode using DMA in mode 3 with 5Msps.
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DMA mode 3 is used in interleaved mode in 6-bit and 8-bit resolutions.
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The Dual interleaved delay is configured 6 ADC clk cycles.
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On each DMA request (two data items are available) two bytes representing two
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ADC-converted data items are transferred as a half word.
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The data transfer order is similar to that of the DMA mode 2.
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A DMA request is generated each time 2 data items are available
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1st request: ADC_CDR[15:0] = (ADC2_DR[7:0] << 8) | ADC1_DR[7:0]
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2nd request: ADC_CDR[15:0] = (ADC2_DR[7:0] << 8) | ADC1_DR[7:0]
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The ADC1 and ADC2 are configured to convert ADC Channel 12, with conversion
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triggered by software.
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By this way, ADC channel 12 is converted each 6 cycles.
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In this example, the system clock is 144MHz, APB2 =72MHz and ADC clock = APB2 /2.
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Since ADCCLK= 36MHz and Conversion rate = 6 cycle
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==> Conversion Time = 36M/6cyc = 6Msps.
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STM32 Eval board's LEDs can be used to monitor the transfer status:
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- LED1 is ON when the conversion is complete.
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- LED3 is ON when there are an error in initialization.
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@note Refer to "simulation.xls" file to have the diagram simulation of the example.
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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, Dual mode, Interleaved, Continuous conversion, Software Trigger, DMA, Measurement,
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@par Directory contents
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- ADC/ADC_DualModeInterleaved/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- ADC/ADC_DualModeInterleaved/Inc/stm32f4xx_it.h Interrupt handlers header file
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- ADC/ADC_DualModeInterleaved/Inc/main.h Main program header file
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- ADC/ADC_DualModeInterleaved/Src/stm32f4xx_it.c Interrupt handlers
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- ADC/ADC_DualModeInterleaved/Src/main.c Main program
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- ADC/ADC_DualModeInterleaved/Src/stm32f4xx_hal_msp.c HAL MSP module
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- ADC/ADC_DualModeInterleaved/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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- 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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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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