Hi Team
UART DMA not works with STM32F767ZI and STM32F745VE.
It does not transmit or receive data.
Testing same code with STM32F405 and STM32G474, UART DMA works fine.
Does anyone know why UART DMA doesn't work on STM32F?
Is there anything to be care of RAM setting when use UART DMA?
My dev. environment:
- STM32CubeIDE Ver1.8.0
- FW Package Ver: FW_F7 V1.16.2
Below is my test code.
※This code will not work unless the DMA and UART interrupts are enabled.
main.c
/* 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\r\n", __DATE__);
printf("%s\r\n", __TIME__);
HAL_UART_Transmit_DMA(&huart2, (uint8_t*) "Hello World!!\r\n", 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 */linker for STM32F745VEH6
/*
******************************************************************************
**
** @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) }
}
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