127 lines
6.5 KiB
Plaintext
127 lines
6.5 KiB
Plaintext
/**
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@page SPI_FullDuplex_ComPolling SPI Two Boards Communication example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file Examples_MIX/SPI/SPI_FullDuplex_ComPolling/readme.txt
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* @author MCD Application Team
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* @brief Description of the SPI Full Duplex Polling example.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2017 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 Polling mode.
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_________________________ _________________________
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| ________CN10______| |_______CN10_________ |
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| |SPI2 | | SPI2 | |
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| | | | | |
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| |(pin30) CLK(PB13)|______________________|(PB13)CLK (pin30) | |
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| | | | | |
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| |(pin28) MISO(PB14)|______________________|(PB14)MISO (pin28) | |
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| | | | | |
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| |(pin26) MOSI(PB15)|______________________|(PB15)MOSI (pin26) | |
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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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|_STM32F1 Master _________| |_STM32F1 Slave __________|
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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 72 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). You may update this function to change SPI configuration.
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The Full-Duplex SPI transfer (16bit) is done using LL Driver functions
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LL_SPI_TransmitData16 and LL_SPI_ReceiveData16.
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Example execution:
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First step, press the User push-button, this action initiates a Full-Duplex transfer
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between Master and Slave.
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After end of transfer, aRxBuffer and aTxBuffer are compared through Buffercmp() in order to
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check buffers correctness.
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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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STM32 board's LEDs can be used to monitor the transfer status:
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- LED2 toggles quickly on master board waiting User push-button to be pressed.
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- LED2 turns ON on both board if transmission/reception is complete and OK.
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- LED2 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 Master board, then perform it on Slave board,
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then press the User button on Master board 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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- Examples_MIX/SPI/SPI_FullDuplex_ComPolling/Inc/stm32f1xx_hal_conf.h HAL configuration file
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- Examples_MIX/SPI/SPI_FullDuplex_ComPolling/Inc/stm32f1xx_it.h SPI interrupt handlers header file
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- Examples_MIX/SPI/SPI_FullDuplex_ComPolling/Inc/main.h Header for main.c module
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- Examples_MIX/SPI/SPI_FullDuplex_ComPolling/Src/stm32f1xx_it.c SPI interrupt handlers
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- Examples_MIX/SPI/SPI_FullDuplex_ComPolling/Src/main.c Main program
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- Examples_MIX/SPI/SPI_FullDuplex_ComPolling/Src/system_STM32F1xx.c STM32F1xx system source file
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- Examples_MIX/SPI/SPI_FullDuplex_ComPolling/Src/stm32f1xx_hal_msp.c HAL MSP file
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@par Hardware and Software environment
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- This example runs on STM32F103xx devices.
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- Take care to cable connection between Master and Slave Board:
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Cable shall be smaller than 5 cm and rigid if possible.
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- This example has been tested with NUCLEO-F103RB board and can be
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easily tailored to any other supported device and development board.
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- NUCLEO-F103RB Set-up
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- Connect Master board PB13 to Slave Board PB13 (pin30 in CN10 connector)
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- Connect Master board PB14 to Slave Board PB14 (pin28 in CN10 connector)
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- Connect Master board PB15 to Slave Board PB15 (pin26 in CN10 connector)
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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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