文件列表:

UART_TwoBoards_ComDMA (0, 2016-11-13)
UART_TwoBoards_ComDMA\EWARM (0, 2016-11-13)
UART_TwoBoards_ComDMA\EWARM\Project.ewd (36880, 2016-05-28)
UART_TwoBoards_ComDMA\EWARM\Project.ewp (29345, 2016-05-28)
UART_TwoBoards_ComDMA\EWARM\Project.eww (161, 2016-05-28)
UART_TwoBoards_ComDMA\EWARM\startup_stm32l053xx.s (12049, 2016-05-31)
UART_TwoBoards_ComDMA\EWARM\stm32l053xx_flash.icf (1353, 2016-05-28)
UART_TwoBoards_ComDMA\Inc (0, 2016-11-13)
UART_TwoBoards_ComDMA\Inc\main.h (4777, 2016-05-31)
UART_TwoBoards_ComDMA\Inc\stm32l0xx_hal_conf.h (11198, 2016-05-31)
UART_TwoBoards_ComDMA\Inc\stm32l0xx_it.h (3173, 2016-05-31)
UART_TwoBoards_ComDMA\MDK-ARM (0, 2016-11-13)
UART_TwoBoards_ComDMA\MDK-ARM\Project.uvoptx (4288, 2016-05-28)
UART_TwoBoards_ComDMA\MDK-ARM\Project.uvprojx (20773, 2016-05-28)
UART_TwoBoards_ComDMA\MDK-ARM\startup_stm32l053xx.s (11053, 2016-05-31)
UART_TwoBoards_ComDMA\Src (0, 2016-11-13)
UART_TwoBoards_ComDMA\Src\main.c (12644, 2016-05-31)
UART_TwoBoards_ComDMA\Src\stm32l0xx_hal_msp.c (7980, 2016-05-31)
UART_TwoBoards_ComDMA\Src\stm32l0xx_it.c (5641, 2016-05-31)
UART_TwoBoards_ComDMA\Src\system_stm32l0xx.c (10325, 2016-05-31)
UART_TwoBoards_ComDMA\SW4STM32 (0, 2016-11-13)
UART_TwoBoards_ComDMA\SW4STM32\startup_stm32l053xx.s (10976, 2016-05-31)
UART_TwoBoards_ComDMA\SW4STM32\STM32L053R8_NUCLEO (0, 2016-11-13)
UART_TwoBoards_ComDMA\SW4STM32\STM32L053R8_NUCLEO\.cproject (11409, 2016-05-28)
UART_TwoBoards_ComDMA\SW4STM32\STM32L053R8_NUCLEO\.project (5016, 2016-05-28)
UART_TwoBoards_ComDMA\SW4STM32\STM32L053R8_NUCLEO\STM32L053R8Tx_FLASH.ld (4416, 2016-05-28)
UART_TwoBoards_ComDMA\TrueSTUDIO (0, 2016-11-13)
UART_TwoBoards_ComDMA\TrueSTUDIO\startup_stm32l053xx.s (10976, 2016-05-31)
UART_TwoBoards_ComDMA\TrueSTUDIO\STM32L053R8_NUCLEO (0, 2016-11-13)
UART_TwoBoards_ComDMA\TrueSTUDIO\STM32L053R8_NUCLEO\.cproject (19326, 2016-05-28)
UART_TwoBoards_ComDMA\TrueSTUDIO\STM32L053R8_NUCLEO\.project (7718, 2016-05-28)
UART_TwoBoards_ComDMA\TrueSTUDIO\STM32L053R8_NUCLEO\.settings (0, 2016-11-13)
UART_TwoBoards_ComDMA\TrueSTUDIO\STM32L053R8_NUCLEO\.settings\com.atollic.truestudio.debug.hardware_device.prefs (219, 2016-05-28)
UART_TwoBoards_ComDMA\TrueSTUDIO\STM32L053R8_NUCLEO\STM32L053R8_FLASH.ld (4501, 2016-05-28)
UART_TwoBoards_ComDMA\TrueSTUDIO\STM32L053R8_NUCLEO\STM32L053R8_NUCLEO.elf.launch (5519, 2016-05-28)

/** @page UART_TwoBoards_ComDMA UART Two Boards Communication DMA example @verbatim ******************** (C) COPYRIGHT 2016 STMicroelectronics ******************* * @file UART/UART_TwoBoards_ComDMA/readme.txt * @author MCD Application Team * @version V1.7.0 * @date 31-May-2016 * @brief Description of the UART Two Boards Communication DMA example. ****************************************************************************** * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************** @endverbatim @par Example Description This Example shows a UART transmission (transmit/receive) between 2 STM32L053R8-Nucleo boards in DMA mode. Tx Pin: PA.09 (PA09 is connected to pin 21 in CN10) Rx Pin: PA.10 (PA10 is connected to pin 33 in CN10) _________________________ _________________________ | ______________| |______________ | | |USART | | USART| | | | | | | | | | TX |_____________________| RX | | | | | | | | | | | | | | | | | | | | | | RX |_____________________| TX | | | | | | | | | |______________| |______________| | | | | | | GND|_____________________|GND | |_STM32_Board 1___________| |_STM32_Board 2___________| 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 2 MHz. Then 1st board is waiting for user button key to be pressed. Once done, data are transmitted through uart1 in DMA mode. 2nd board has configured uart1 to receive data in DMA mode. Once data received is completed, 2nd board also transmit same characters on uart1 which will be received by 1st board. Both boards compare transmitted data to received ones. If they are same, green led2 is turn on, else led2 is turn Off. Warning: As both boards do not behave same way, "TRANSMITTER_BOARD" switch compilation exists to determine either software is for 1st transmitter board or 2nd receiver (then transmitter) board. In other words, 1st board has to be flashed with software compiled with switch enable, 2nd board has to be flashed with software compiled with switch disable. LED2 can be used to monitor the transfer status: - LED2 turns ON on master board waiting user button to be pressed. - LED2 turns OFF on master board waiting the transmission process is complete. - LED2 turns ON when the transmission/reception process is correct. The UART is configured as follow: - BaudRate = 9600 baud - Word Length = 8 Bits (7 data bit + 1 parity bit) - One Stop Bit - None parity - Hardware flow control disabled (RTS and CTS signals) - Reception and transmission are enabled in the time @note USARTx/UARTx instance used and associated resources can be updated in "main.h" file depending hardware configuration used. @note When the parity is enabled, the computed parity is inserted at the MSB position of the transmitted data. @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. @par Directory contents - UART/UART_TwoBoards_ComDMA/Inc/stm32l0xx_hal_conf.h HAL configuration file - UART/UART_TwoBoards_ComDMA/Inc/stm32l0xx_it.h DMA interrupt handlers header file - UART/UART_TwoBoards_ComDMA/Inc/main.h Header for main.c module - UART/UART_TwoBoards_ComDMA/Src/stm32l0xx_it.c DMA interrupt handlers - UART/UART_TwoBoards_ComDMA/Src/main.c Main program - UART/UART_TwoBoards_ComDMA/Src/stm32l0xx_hal_msp.c HAL MSP module - UART/UART_TwoBoards_ComDMA/Src/system_stm32l0xx.c STM32L0xx system source file @par Hardware and Software environment - This example runs on STM32L051xx, STM32L052xx, STM32L053xx STM32L062xx and STM32L063xx device lines RevZ - This example has been tested with STM32L053R8-Nucleo RevC and can be easily tailored to any other supported device and development board. - STM32L053R8-Nucleo RevC Set-up - Connect a wire between 1st board PA9 (pin 21 in CN10 connector) pin (Uart Tx) to 2nd board PA10 (pin 33 in CN10 connector) pin (Uart Rx) - Connect a wire between 1st board PA10 (pin 33 in CN10 connector) pin (Uart Rx) to 2nd board PA9 (pin 21 in CN10 connector) pin (Uart Tx) @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 - Run the example *

© COPYRIGHT STMicroelectronics

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