stm32f302 使用DMA+USART 接收一直在空闲中断中出不来

Maximilian · 发表于 2017-12-25 20:32:03

stm32f302 使用DMA+USART 接收一直在空闲中断中出不来  一直打印的都是

The lenght:128
The lenght:128
The lenght:128

#define USART2_RDR_ADDRESS       ((u32)(USART2_BASE+0x24))
u8 dma_flag = 0;

__IO char  receive_data[128]={0};

void Usart2_Init(uint32_t bound){

  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);

/* ′®¿ú2¶Ôó|òy½Å¸′óÃó3éä
   * GPIOA2¸′óÃÎaUSART2
   * GPIOA3¸′óÃÎaUSART2
   */
GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_7);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource3,GPIO_AF_7);

/* USART2¶Ë¿úÅäÖÃ
   * GPIOA2,GPIOA3
   */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA,&GPIO_InitStructure);

//USART2 3õê¼»ˉéèÖÃ
USART_InitStructure.USART_BaudRate = bound;
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);

#if 1
NVIC_InitTypeDef NVIC_InitStructure;
//Usart2 NVIC ÅäÖÃ
      NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif

//---USRAT_DMA
USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);
USART_Cmd(USART2, ENABLE);
}

#if 1
void USART2_IRQHandler(void)
{
u16 num;
if(USART_GetITStatus(USART2,USART_IT_IDLE) != RESET)
{

num = USART1->ISR;
num = USART1->RDR;
            DMA_Cmd(DMA1_Channel6,DISABLE);
num = 128 - DMA_GetCurrDataCounter(DMA1_Channel6);
         printf ("The lenght:%d\r\n",num);
DMA1_Channel6->CNDTR=128;
USART_ClearITPendingBit(USART1, USART_IT_IDLE);
DMA_Cmd(DMA1_Channel6,ENABLE);

  }
}
#endif

void Usart2_DMA_Config()
{
DMA_InitTypeDef  DMA_InitStructure;
// ------------------DMA Init ½á11ìå2Îêy 3õê¼»ˉ--------------------------
  /* Enable DMA1 clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
  DMA_DeInit(DMA1_Channel6);
  DMA_Cmd(DMA1_Channel6, DISABLE);
  DMA_InitStructure.DMA_PeripheralBaseAddr = ((u32)USART2_RDR_ADDRESS);
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)receive_data;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 128;
  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_Normal ;
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
/* Enable DMA1 Channel6 */

  DMA_Init(DMA1_Channel6, &DMA_InitStructure);
  DMA_Cmd(DMA1_Channel6, ENABLE);

}

void USART2_DMA_Init(uint32_t bound)
{
Usart2_Init(115200);
Usart2_DMA_Config();
}

八度空间 · 发表于 2017-12-25 20:32:04

本帖最后由八度空间于 2017-12-26 09:22 编辑

[mw_shl_code=applescript,true]/**
  *****************************************************************************
  * @name : 串口接收中断服务程序
  *
  * @Brief  : none
  *
  * @Input  : none
  *
  * @Output : none
  *
  * @Return : none
  *****************************************************************************
**/
void USART1_IRQHandler(void)
{
      u32 status = 0;

      if (USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)  //产生了空闲中断
      {
            status = taskENTER_CRITICAL_FROM_ISR();
            DMA_Cmd(DMA1_Channel3, DISABLE);  //先关闭，预防干扰
            RX_Index = DMA_BUF_SIZE - DMA_GetCurrDataCounter(DMA1_Channel3);  //获取当前接收到的数据长度
            DMA1_Channel3->CNDTR = (uint16_t)DMA_BUF_SIZE;  //重新配置接收长度
            DMA_Cmd(DMA1_Channel3, ENABLE);

            (void)USART_ReceiveData(USART1);

            taskEXIT_CRITICAL_FROM_ISR(status);
      }
      USART_ClearITPendingBit(USART1, USART_IT_IDLE);
}[/mw_shl_code]

这是我的空闲中断处理

上面的做法是中断里边逗留的时间非常短，为了避免意外发生，改为下面的安全一点
[mw_shl_code=applescript,true]/**
  *****************************************************************************
  * @Name : 串口接收中断服务程序
  *
  * @Brief  : none
  *
  * @Input  : none
  *
  * @Output : none
  *
  * @Return : none
  *****************************************************************************
**/
void USART1_IRQHandler(void)
{
u32 status = 0;

status = taskENTER_CRITICAL_FROM_ISR();

if (USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)  //产生了空闲中断
{
DMA_Cmd(DMA1_Channel3, DISABLE);  //先关闭，预防干扰
RX_Index = DMA_BUF_SIZE - DMA_GetCurrDataCounter(DMA1_Channel3);  //获取当前接收到的数据长度
DMA1_Channel3->CNDTR = (uint16_t)DMA_BUF_SIZE;  //重新配置接收长度
DMA_Cmd(DMA1_Channel3, ENABLE);

(void)USART_ReceiveData(USART1);
}
USART_ClearITPendingBit(USART1, USART_IT_IDLE);

taskEXIT_CRITICAL_FROM_ISR(status);
}[/mw_shl_code]