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interrupt problem for dma in usart

Question asked by armoun.mohamad on Mar 9, 2014
Latest reply on Mar 9, 2014 by Clive One
hi guys, i wanna use interrupt for dma that i set for USART2 Rx/Tx  but i don't know how can i implement  intrrupt  functions , here is my code please tell me how can i use interrupt for Rx and Tx dma in my code:

#include "stm32f4xx.h"


void RCC_Configuration(void)
{
  /* --------------------------- System Clocks Configuration -----------------*/
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, 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);
 
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
}


void USART2_Configuration(void)


    USART_IniTypeDef 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_Disable;
  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);
  USART_DMACmd(USART2, USART_DMAReq_Rx, ENABLE);
  DMA_Cmd(DMA1_Stream5, ENABLE);
}
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);
}


uint8_t Tx_Buffer;
void DMA_Tx_Configuration()
{
  DMA_InitTypeDef  DMA_InitStructure;
  DMA_DeInit(DMA1_Stream6);
 
  DMA_InitStructure.DMA_Channel = DMA_Channel_4;
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; // send
 
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&Tx_Buffer;
  DMA_InitStructure.DMA_BufferSize = (uint16_t)sizeof(Tx_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_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
 
  DMA_Init(DMA1_Stream6, &DMA_InitStructure);
 
  USART_DMACmd(USART2, USART_DMAReq_Tx, ENABLE);


  DMA_Cmd(DMA1_Stream6, ENABLE);
}


int main()
{RCC_Configuration();


 
    GPIO_Configuration();
 
    USART2_Configuration();
 
    DMA_Rx_Configuration();
    DMA_Tx_Configuration();
    
    init_LED();
    
  uint8_t temp = 0;
  while(1){
   temp = Rx_Buffer  ;
  while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET); 
    // USART_SendData(USART2, temp);
  Tx_Buffer = Rx_Buffer;
     if(temp > 0){
       GPIO_SetBits(GPIOD,GPIO_Pin_12);
       GPIO_SetBits(GPIOD,GPIO_Pin_13);
     }
  }
}

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