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interrupt problem for dma in usart

Question asked by armoun.mohamad on Mar 12, 2014
hi clive. thanks for information. i completed my code for stm32f4 Discovery with your idea with the link that you put here. i think it should be worked , but it doesn't. what's your idea about my code???
thanks in advance



#include "stm32f4xx.h"
 
void RCC_Configuration(void)
{
  /* --------------------------- System Clocks Configuration -----------------*/
  /* USART2 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
  
  /* GPIOA clock enable */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
  
  /* DMA1 clock enable */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
}
 
 
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  /*-------------------------- GPIO Configuration ----------------------------*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  /* Connect USART pins to AF */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
}
void init_LED()
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  /*-------------------------- GPIO Configuration ----------------------------*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOD, &GPIO_InitStructure);
}
 
 
void USART2_Configuration(void)
{
    USART_InitTypeDef USART_InitStructure;
  
  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  
  USART_Init(USART2, &USART_InitStructure);
  
  USART_Cmd(USART2, ENABLE);
}
 
 
uint8_t Rx_Buffer;
void DMA_Rx_Configuration(void)
{
  DMA_InitTypeDef  DMA_InitStructure;
  
  DMA_DeInit(DMA1_Stream5);
  DMA_InitStructure.DMA_Channel = DMA_Channel_4;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; // receive
  
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&Rx_Buffer;
  DMA_InitStructure.DMA_BufferSize = (uint16_t)sizeof(Rx_Buffer);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART2->DR;
  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_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  
  DMA_Init(DMA1_Stream5, &DMA_InitStructure);
  
  /* Enable the USART Rx DMA request */
  USART_DMACmd(USART2, USART_DMAReq_Rx, ENABLE);
  
  /* Enable DMA Stream Half Transfer and Transfer Complete interrupt */
  DMA_ITConfig(DMA1_Stream5, DMA_IT_TC, ENABLE);
//  DMA_ITConfig(DMA1_Stream5, DMA_IT_HT, ENABLE);
  
  /* Enable the DMA RX Stream */
  DMA_Cmd(DMA1_Stream5, ENABLE);
}
 
 
 
void NVIC_Rx_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  
  /* Configure the Priority Group to 2 bits */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
  
  /* Enable the UART4 RX DMA Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}
 
 
void DMA1_Stream5_IRQHandler(void)
{
 /* Test on DMA Stream Transfer Complete interrupt */
  if (DMA_GetITStatus(DMA1_Stream5, DMA_IT_TCIF5))
  {
    /* Clear DMA Stream Transfer Complete interrupt pending bit */
    DMA_ClearITPendingBit(DMA1_Stream5, DMA_IT_TCIF5);
     
    DMA_Rx_Configuration();
  }
}
 
 
 
 
int main()
{
    RCC_Configuration();
  
    GPIO_Configuration();
  
    USART2_Configuration();
  
    DMA_Rx_Configuration();
 
    NVIC_Rx_Configuration();
 
    init_LED();
     
  uint8_t temp = 0;
  while(1){
   temp = Rx_Buffer  ;GPIO_SetBits(GPIOD,GPIO_Pin_12);
   while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
   USART_SendData(USART2,Rx_Buffer);
//   Tx_Buffer = Rx_Buffer;
     if(temp > 0){
        
       GPIO_SetBits(GPIOD,GPIO_Pin_13);
     }
  }
}

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