/**
@page SPI_FullDuplex_ComDMA SPI Full Duplex DMA example
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file SPI/SPI_FullDuplex_ComDMA/readme.txt
* @author MCD Application Team
* @brief Description of the SPI Full Duplex DMA example.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@endverbatim
@par Example Description
This example shows how to perform SPI data buffer transmission/reception between
two boards via DMA.
_________________________ __________________________
| __________________| |__________________ |
| |SPI2 | | SPI2| |
| | | | | |
| | CLK(PD3) |______________________|(PD3)CLK | |
| | | | | |
| | MISO(PB14)|______________________|(PB14)MISO | |
| | | | | |
| | MOSI(PB15)|______________________|(PB15)MOSI | |
| | | | | |
| |______________| |______________| |
| __ | | |
| |__| | | |
| USER | | |
| GND|______________________|GND |
| | | |
|_STM32F4 Master _________| |_STM32F4 Slave __________|
HAL architecture allows user to easily change code to move to Polling or IT
mode. To see others communication modes please check following examples:
SPI\SPI_FullDuplex_ComPolling
SPI\SPI_FullDuplex_ComIT
At the beginning of the main program the HAL_Init() function is called to reset
all the peripherals, initialize the Flash interface and the systick.
Then the SystemClock_Config() function is used to configure the system
clock (SYSCLK) to run at 180 MHz.
The SPI peripheral configuration is ensured by the HAL_SPI_Init() function.
This later is calling the HAL_SPI_MspInit()function which core is implementing
the configuration of the needed SPI resources according to the used hardware (CLOCK,
GPIO, DMA and NVIC). You may update this function to change SPI configuration.
The SPI communication is then initiated.
The HAL_SPI_TransmitReceive_DMA() function allows the reception and the
transmission of a predefined data buffer at the same time (Full Duplex Mode).
The user can choose between Master and Slave through "#define MASTER_BOARD"
in the "main.c" file.
If the Master board is used, the "#define MASTER_BOARD" must be uncommented.
If the Slave board is used the "#define MASTER_BOARD" must be commented.
For this example the aTxBuffer is predefined and the aRxBuffer size is same as aTxBuffer.
In a first step after the user press the User push-button, SPI Master starts the
communication by sending aTxBuffer and receiving aRxBuffer through
HAL_SPI_TransmitReceive_DMA(), at the same time SPI Slave transmits aTxBuffer
and receives aRxBuffer through HAL_SPI_TransmitReceive_DMA().
The callback functions (HAL_SPI_TxRxCpltCallback and HAL_SPI_ErrorCallbackand) update
the variable wTransferState used in the main function to check the transfer status.
Finally, aRxBuffer and aTxBuffer are compared through Buffercmp() in order to
check buffers correctness.
STM32 boards LEDs can be used to monitor the transfer status:
- LED2 toggles quickly on master board waiting User push-button to be pressed.
- LED2 turns ON when the transmission process is complete.
- LED4 turns ON when the reception process is complete.
- LED3 turns ON when there is an error in transmission/reception process.
@note SPIx instance used and associated resources can be updated in "main.h"
file depending hardware configuration used.
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
@note The application need to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.
@note The connection of the LCD reset pin to a dedicated GPIO PH7 instead of the STM32F469 NRST pin may cause residual display on LCD with applications/examples that do not require display.
The LCD clear can be ensured by hardware through the boards power off/power on or by software calling the BSP_LCD_Reset() function.
@par Keywords
Connectivity, SPI, Full-duplex, DMA, Transmission, Reception, Master, Slave, MISO, MOSI
@par Directory contents
- SPI/SPI_FullDuplex_ComDMA/Inc/stm32f4xx_hal_conf.h HAL configuration file
- SPI/SPI_FullDuplex_ComDMA/Inc/stm32f4xx_it.h Interrupt handlers header file
- SPI/SPI_FullDuplex_ComDMA/Inc/main.h Header for main.c module
- SPI/SPI_FullDuplex_ComDMA/Src/stm32f4xx_it.c Interrupt handlers
- SPI/SPI_FullDuplex_ComDMA/Src/main.c Main program
- SPI/SPI_FullDuplex_ComDMA/Src/system_stm32f4xx.c stm32f4xx system source file
- SPI/SPI_FullDuplex_ComDMA/Src/stm32f4xx_hal_msp.c HAL MSP file
@par Hardware and Software environment
- This example runs on STM32F469xx devices.
- This example has been tested with STM32469I-DISCOVERY board and can be
easily tailored to any other supported device and development board.
- STM32469I-DISCOVERY Set-up
- Connect Master board PD3 to Slave Board PD3 (Arduino D13)
- Connect Master board PB14 to Slave Board PB14 (Arduino D12)
- Connect Master board PB15 to Slave Board PB15 (Arduino D11)
- Connect Master board GND to Slave Board GND
@par How to use it ?
In order to make the program work, you must do the following:
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
o Uncomment "#define MASTER_BOARD" and load the project in Master Board
o Comment "#define MASTER_BOARD" and load the project in Slave Board
- Run the example
*/
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