UART4 DMA Rx Problem

>

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; // Receive

Don't we choose ''DMA_DIR_PeripheralDST'' when interrupt comes Rx Pin ?

Don't we choose ''DMA_DIR_PeripheralDST'' when interrupt comes Rx Pin ?

Is my BufferSize correct ? 

I changed the DMA_DIR_PeripheralDST to DMA_DIR_PeripheralSRC .

If you use Normal mode you'll need to reinitialize the DMA on each interrupt

I changed the DMA_InitStructure.DMA_Mode to  DMA_Mode_Circular but the problem has not solved. 

to be migrated, sourceId: 40316:697285D7-A9CA-445D-B16C-F23BF0E3B1A3

The last version is following below. I cannot understand where is the wrong ?

I'd perhaps demo it as follows, quick blind port

// STM32F103-XL UART4 DMA TX/RX (Tx PC.10, Rx PC.11) - sourcer32@gmail.com
#include ''stm32F10x.h''
/**************************************************************************************/
void RCC_Configuration(void)
{
/* Enable DMA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
/* Enable UART clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);
}
/**************************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; // PC.10 UART4.TX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* Configure USART Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; // PC.11 UART4.RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
/**************************************************************************************/
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
/* USART resources configuration (Clock, GPIO pins and USART registers) ----*/
/* USART configured as follow:
- BaudRate = 1200 baud
- Word Length = 8 Bits
- One Stop Bit
- Even parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 1200;
USART_InitStructure.USART_WordLength = USART_WordLength_9b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_Even;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
/* USART configuration */
USART_Init(UART4, &USART_InitStructure);
/* Enable the UART4 */
USART_Cmd(UART4, ENABLE);
}
/**************************************************************************************/
volatile char Buffer[] = ''The quick brown fox jumps over the lazy dog

'';
void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
/* UART4_TX DMA2 Channel 5 (See RM0008) */
DMA_DeInit(DMA2_Channel5);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&UART4->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = sizeof(Buffer) - 1;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA2_Channel5, &DMA_InitStructure);
USART_DMACmd(UART4, USART_DMAReq_Tx, ENABLE);
/* Enable DMA Stream Transfer Complete interrupt */
DMA_ITConfig(DMA2_Channel5, DMA_IT_TC, ENABLE);
/* UART4_RX DMA2 Channel 3 (See RM0008) */
DMA_DeInit(DMA2_Channel3);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&UART4->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = sizeof(Buffer) - 1;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA2_Channel3, &DMA_InitStructure);
USART_DMACmd(UART4, USART_DMAReq_Rx, ENABLE);
/* Enable DMA Stream Transfer Complete interrupt */
DMA_ITConfig(DMA2_Channel3, DMA_IT_TC, ENABLE);
DMA_Cmd(DMA2_Channel5, ENABLE);
DMA_Cmd(DMA2_Channel3, ENABLE);
}
/**************************************************************************************/
void DMA2_Channel4_5_IRQHandler(void) // UART4_TX
{
/* Test on DMA Transfer Complete interrupt */
if (DMA_GetITStatus(DMA2_IT_TC5))
{
/* Clear DMA Transfer Complete interrupt pending bit */
DMA_ClearITPendingBit(DMA2_IT_TC5);
/* ... */
}
}
/**************************************************************************************/
void DMA2_Channel3_IRQHandler(void) // UART4_RX
{
/* Test on DMA Transfer Complete interrupt */
if (DMA_GetITStatus(DMA2_IT_TC3))
{
/* Clear DMA Transfer Complete interrupt pending bit */
DMA_ClearITPendingBit(DMA2_IT_TC3);
/* ... */
}
}
/**************************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the Priority Group to 2 bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
/* Enable the UART4 TX DMA Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel4_5_IRQn; // Combined on XL, CL has unique
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the UART4 RX DMA Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/**************************************************************************************/
int main(void)
{
RCC_Configuration();
NVIC_Configuration();
GPIO_Configuration();
USART_Configuration();
DMA_Configuration();
while(1);
}
/**************************************************************************************/
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf(''Wrong parameters value: file %s on line %d

'', file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**************************************************************************************/