[问答]

请问UART DMA适用于STM32F767ZI和STM32F745VE吗？为什么不传输接收数据呢？

问答对人有帮助，内容完整，我也想知道答案 0 大家好的 UART DMA 不适用于 STM32F767ZI 和 STM32F745VE。它不传输或接收数据。的使用 STM32F405 和 STM32G474 测试相同的代码，UART DMA 工作正常。的有谁知道为什么 UART DMA 在 STM32F 上不起作用？使用UART DMA时RAM设置有什么需要注意的吗？的我的开发者环境： STM32CubeIDE Ver1.8.0 固件包版本：FW_F7 V1.16.2 的下面是我的测试代码。 ※除非启用 DMA 和 UART 中断，否则此代码将不起作用。的主程序 /* Private define ------------------------------------------------------------/ / USER CODE BEGIN PD / #ifdef __GNUC__ #define PUTCHAR_PROTOTYPE int __io_putchar(int ch) #define GETCHAR_PROTOTYPE int __io_getchar(void) #else #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE f) #define GETCHAR_PROTOTYPE int fgetc(FILE f) #endif / __GNUC__ / / USER CODE END PD / / Private macro -------------------------------------------------------------/ / USER CODE BEGIN PM / / USER CODE END PM / / Private variables ---------------------------------------------------------/ / USER CODE BEGIN PV / #define RX_BUFFER_SIZE (16) #define TX_BUFFER_SIZE (16) uint8_t rx_buffer[RX_BUFFER_SIZE]; uint8_t tx_buffer[TX_BUFFER_SIZE]; / USER CODE END PV / / Private function prototypes -----------------------------------------------/ int main(void) { / USER CODE BEGIN 1 / / USER CODE END 1 / / MCU Configuration--------------------------------------------------------/ / Reset of all peripherals, Initializes the Flash interface and the Systick. / HAL_Init(); / USER CODE BEGIN Init / / USER CODE END Init / / Configure the system clock / SystemClock_Config(); / USER CODE BEGIN SysInit / / USER CODE END SysInit / / Initialize all configured peripherals / MX_GPIO_Init(); MX_DMA_Init(); MX_USART2_UART_Init(); / USER CODE BEGIN 2 / printf("%s ", __DATE__); printf("%s ", __TIME__); HAL_UART_Transmit_DMA(&huart2, (uint8_t) "Hello World!! ", 13); while (huart2.gState != HAL_UART_STATE_READY) { __NOP(); } if (HAL_UART_Receive_DMA(&huart2, rx_buffer, 4) == HAL_ERROR) { __NOP(); } /* USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / __NOP(); } / USER CODE END 3 / } / USER CODE BEGIN 4 / PUTCHAR_PROTOTYPE { __HAL_UART_FLUSH_DRREGISTER(&huart2); __HAL_UART_CLEAR_OREFLAG(&huart2); HAL_UART_Transmit(&huart2, (uint8_t )&ch, 1, HAL_MAX_DELAY); return ch; } GETCHAR_PROTOTYPE { int ch; __HAL_UART_FLUSH_DRREGISTER(&huart2); __HAL_UART_CLEAR_OREFLAG(&huart2); HAL_UART_Receive(&huart2, (uint8_t )&ch, 1, HAL_MAX_DELAY); return ch; } / USER CODE END 4 / uart.c* /* USER CODE BEGIN 1 / void HAL_UART_TxCpltCallback(UART_HandleTypeDef huart) { if (huart->Instance == USART2) { huart2.gState = HAL_UART_STATE_READY; __NOP(); } } extern uint8_t rx_buffer[]; void HAL_UART_RxCpltCallback(UART_HandleTypeDef huart) { if (huart->Instance == USART2) { HAL_UART_Receive_DMA(&huart2, rx_buffer, 4); __NOP(); } } void HAL_UART_ErrorCallback(UART_HandleTypeDef huart) { if (huart->Instance == USART2) { __NOP(); } } /* USER CODE END 1 / STM32F745VEH6 链接器 / **************************************************************************** @file : LinkerScript.ld @author : Auto-generated by STM32CubeIDE @brief : Linker script for STM32F745VEHx Device from STM32F7 series 512Kbytes FLASH 320Kbytes RAM Set heap size, stack size and stack location according to application requirements. Set memory bank area and size if external memory is used Target : STMicroelectronics STM32 Distribution: The file is distributed as is, without any warranty of any kind. **************************************************************************** @attention Copyright (c) 2022 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. ****************************************************************************** / / Entry Point / ENTRY(Reset_Handler) / Highest address of the user mode stack / _estack = ORIGIN(SRAM1) + LENGTH(SRAM1); / end of "RAM" Ram type memory / _Min_Heap_Size = 0x1000 ; / required amount of heap / _Min_Stack_Size = 0x1000 ; / required amount of stack / / Memories definition / MEMORY { DTCM_RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 64K SRAM1 (xrw) : ORIGIN = 0x20010000, LENGTH = 240K SRAM2 (xrw) : ORIGIN = 0x2004C000, LENGTH = 16K ITCM_RAM (xrw) : ORIGIN = 0x00000000, LENGTH = 16K FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 512K } / Sections / SECTIONS { / The startup code into "FLASH" Rom type memory / .isr_vector : { . = ALIGN(4); KEEP((.isr_vector)) /* Startup code / . = ALIGN(4); } >FLASH / The program code and other data into "FLASH" Rom type memory / .text : { . = ALIGN(4); (.text) /* .text sections (code) / (.text) / .text* sections (code) / (.glue_7) /* glue arm to thumb code / (.glue_7t) /* glue thumb to arm code / (.eh_frame) KEEP ((.init)) KEEP ((.fini)) . = ALIGN(4); _etext = .; /* define a global symbols at end of code / } >FLASH / Constant data into "FLASH" Rom type memory / .rodata : { . = ALIGN(4); (.rodata) /* .rodata sections (constants, strings, etc.) / (.rodata) / .rodata* sections (constants, strings, etc.) / . = ALIGN(4); } >FLASH .ARM.extab : { . = ALIGN(4); (.ARM.extab* .gnu.linkonce.armextab.) . = ALIGN(4); } >FLASH .ARM : { . = ALIGN(4); __exidx_start = .; (.ARM.exidx) __exidx_end = .; . = ALIGN(4); } >FLASH .preinit_array : { . = ALIGN(4); PROVIDE_HIDDEN (__preinit_array_start = .); KEEP ((.preinit_array)) PROVIDE_HIDDEN (__preinit_array_end = .); . = ALIGN(4); } >FLASH .init_array : { . = ALIGN(4); PROVIDE_HIDDEN (__init_array_start = .); KEEP ((SORT(.init_array.))) KEEP ((.init_array)) PROVIDE_HIDDEN (__init_array_end = .); . = ALIGN(4); } >FLASH .fini_array : { . = ALIGN(4); PROVIDE_HIDDEN (__fini_array_start = .); KEEP ((SORT(.fini_array.))) KEEP ((.fini_array)) PROVIDE_HIDDEN (__fini_array_end = .); . = ALIGN(4); } >FLASH / Used by the startup to initialize data / _sidata = LOADADDR(.data); / Initialized data sections into "SRAM1" Ram type memory / .data : { . = ALIGN(4); _sdata = .; / create a global symbol at data start / (.data) /* .data sections / (.data) / .data* sections / (.RamFunc) /* .RamFunc sections / (.RamFunc) / .RamFunc* sections / . = ALIGN(4); _edata = .; / define a global symbol at data end / } >SRAM1 AT> FLASH / Uninitialized data section into "SRAM1" Ram type memory / . = ALIGN(4); .bss : { / This is used by the startup in order to initialize the .bss section / _sbss = .; / define a global symbol at bss start / __bss_start__ = _sbss; (.bss) (.bss) (COMMON) . = ALIGN(4); _ebss = .; / define a global symbol at bss end / __bss_end__ = _ebss; } >SRAM1 / User_heap_stack section, used to check that there is enough "SRAM1" Ram type memory left / ._user_heap_stack : { . = ALIGN(8); PROVIDE ( end = . ); PROVIDE ( _end = . ); . = . + _Min_Heap_Size; . = . + _Min_Stack_Size; . = ALIGN(8); } >SRAM1 / Remove information from the compiler libraries / /DISCARD/ : { libc.a ( ) libm.a ( * ) libgcc.a ( * ) } .ARM.attributes 0 : { *(.ARM.attributes) } } 0
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答案对人有帮助，有参考价值 0 存在STM32CubeIDE（CubeMX）生成代码bug！的如果 UART 在 DMA 之前初始化，UART DMA 将无法工作。 UART 应在 DMA 之后初始化。的例如这个初始化序列，UART DMA 不起作用。 /* Initialize all configured peripherals / MX_UART4_Init(); MX_UART5_Init(); MX_DMA_Init(); 并且，这个初始化序列，UART DMA 工作。 / Initialize all configured peripherals */ MX_DMA_Init(); MX_UART4_Init(); MX_UART5_Init(); 据我测试，行为在 STM32F4/G4/F7 上是相同的。

2022-12-13 11:27:38 评论举报李新梅