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133 lines
6.8 KiB
Plaintext
133 lines
6.8 KiB
Plaintext
/**
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@page SPI_FullDuplex_ComDMA SPI Full Duplex DMA example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file SPI/SPI_FullDuplex_ComDMA/readme.txt
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* @author MCD Application Team
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* @brief Description of the SPI Full Duplex DMA 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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Data buffer transmission/reception between two boards via SPI using DMA.
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_________________________ __________________________
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| _______________| |_______________ |
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| |SPI1 | | SPI1| |
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| | | | | |
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| | CLK(PA5) |______________________|(PA5)CLK | |
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| | | | | |
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| | MISO(PA6) |______________________|(PA6)MISO | |
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| | | | | |
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| | MOSI(PA7) |______________________|(PA7)MOSI | |
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| | | | | |
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| |______________| |______________| |
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| __ | | |
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| |__| | | |
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| USER | | |
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| GND|______________________|GND |
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| | | |
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|_STM32F0 Master _________| |_STM32F0 Slave __________|
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HAL architecture allows user to easily change code to move to Polling or IT
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mode. To see others communication modes please check following examples:
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SPI\SPI_FullDuplex_ComPolling
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SPI\SPI_FullDuplex_ComIT
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At the beginning of the main program the HAL_Init() function is called to reset
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all the peripherals, initialize the Flash interface and the systick.
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Then the SystemClock_Config() function is used to configure the system
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clock (SYSCLK) to run at 48 MHz.
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The SPI peripheral configuration is ensured by the HAL_SPI_Init() function.
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This later is calling the HAL_SPI_MspInit()function which core is implementing
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the configuration of the needed SPI resources according to the used hardware (CLOCK,
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GPIO, DMA and NVIC). You may update this function to change SPI configuration.
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The SPI communication is then initiated.
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The HAL_SPI_TransmitReceive_DMA() function allows the reception and the
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transmission of a predefined data buffer at the same time (Full Duplex Mode).
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The user can choose between Master and Slave through "#define MASTER_BOARD"
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in the "main.c" file.
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If the Master board is used, the "#define MASTER_BOARD" must be uncommented.
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If the Slave board is used the "#define MASTER_BOARD" must be commented.
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For this example the aTxBuffer is predefined and the aRxBuffer size is same as aTxBuffer.
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In a first step after the user connects the PA.12 (Arduino D2) to GND, SPI Master starts the
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communication by sending aTxBuffer and receiving aRxBuffer through
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HAL_SPI_TransmitReceive_DMA(), at the same time SPI Slave transmits aTxBuffer
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and receives aRxBuffer through HAL_SPI_TransmitReceive_DMA().
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The callback functions (HAL_SPI_TxRxCpltCallback and HAL_SPI_ErrorCallbackand) update
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the variable wTransferState used in the main function to check the transfer status.
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Finally, aRxBuffer and aTxBuffer are compared through Buffercmp() in order to
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check buffers correctness.
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STM32 board's LEDs can be used to monitor the transfer status:
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- LED3 toggles quickly on master board waiting PA.12 (Arduino D2) to be connected to GND
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- LED3 turns ON if transmission/reception is complete and OK.
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- LED3 toggles slowly when there is a timeout or an error in transmission/reception process.
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@note SPIx instance used and associated resources can be updated in "main.h"
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file depending hardware configuration used.
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@note You need to perform a reset on Slave board, then perform it on Master board
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to have the correct behaviour of this 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 need 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 Directory contents
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- SPI/SPI_FullDuplex_ComDMA/Inc/stm32f0xx_hal_conf.h HAL configuration file
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- SPI/SPI_FullDuplex_ComDMA/Inc/stm32f0xx_it.h Interrupt handlers header file
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- SPI/SPI_FullDuplex_ComDMA/Inc/main.h Header for main.c module
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- SPI/SPI_FullDuplex_ComDMA/Src/stm32f0xx_it.c Interrupt handlers
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- SPI/SPI_FullDuplex_ComDMA/Src/main.c Main program
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- SPI/SPI_FullDuplex_ComDMA/Src/system_stm32f0xx.c stm32f0xx system source file
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- SPI/SPI_FullDuplex_ComDMA/Src/stm32f0xx_hal_msp.c HAL MSP file
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@par Hardware and Software environment
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- This example runs on STM32F031x6 devices.
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- This example has been tested with STM32F031K6-Nucleo(revC) board and can be
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easily tailored to any other supported device and development board.
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- STM32F031K6-Nucleo(revC) Set-up
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- Connect Master board PA5 to Slave Board PA5 (Arduino A4)
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- Connect Master board PA6 to Slave Board PA6 (Arduino A5)
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- Connect Master board PA7 to Slave Board PA7 (Arduino A6)
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- Connect Master board GND to Slave 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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o Uncomment "#define MASTER_BOARD" and load the project in Master Board
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o Comment "#define MASTER_BOARD" and load the project in Slave Board
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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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