Question

我将定时器配置为输入捕捉模式，并将DMA2通道6流1配置为将数据从GPIOC传输到frame_buffer。它有效，但是只有一次-首次使用后有数据，在下一次传输中只有零。要使其再次工作，我必须加载另一个项目，然后加载该项目。似乎是标志的问题-以前我有DMA中断，程序无法摆脱它

我正在使用STM32F411发现板

我的标志可能做错了，但是我找不到问题所在

这是我的代码：

DMA和计时器配置：

void TimerAndDMAConfigure(void){

  GPIO_InitTypeDef gpioPCLK;
  TIM_ICInitTypeDef icTIM1;
  DMA_InitTypeDef dmaPerToMem;

  NVIC_InitTypeDef nvic;

  //GPIOE config
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);

  gpioPCLK.GPIO_Mode = GPIO_Mode_AF;
  gpioPCLK.GPIO_OType = GPIO_OType_OD;
  gpioPCLK.GPIO_Pin = GPIO_Pin_9;
  gpioPCLK.GPIO_PuPd = GPIO_PuPd_NOPULL;
  gpioPCLK.GPIO_Speed = GPIO_High_Speed;
  GPIO_Init(GPIOE, &gpioPCLK);
  GPIO_PinAFConfig(GPIOE, GPIO_PinSource9, GPIO_AF_TIM1);


  //Timer config
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  icTIM1.TIM_Channel = TIM_Channel_1;
  icTIM1.TIM_ICPolarity = TIM_ICPolarity_Rising;
  icTIM1.TIM_ICSelection = TIM_ICSelection_DirectTI;
  icTIM1.TIM_ICPrescaler = TIM_ICPSC_DIV1;
  icTIM1.TIM_ICFilter = 0;
  TIM_ICInit(TIM1, &icTIM1);

  TIM_CtrlPWMOutputs(TIM1, ENABLE);
  TIM_SelectOutputTrigger(TIM8 , TIM_TRGOSource_Reset);
  TIM_Cmd(TIM1, ENABLE);
  TIM_DMAConfig(TIM1, TIM_DMABase_CCR1, TIM_DMABurstLength_1Transfer);
  TIM_DMACmd(TIM1, TIM_DMA_CC1, ENABLE);


  //DMA config - peripheral to memory
  //DMA2 Stream 1 Channel 6
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

  DMA_DeInit(DMA2_Stream1);

  dmaPerToMem.DMA_BufferSize = 174*2;
  dmaPerToMem.DMA_Channel = DMA_Channel_6;
  dmaPerToMem.DMA_DIR=DMA_DIR_PeripheralToMemory;
  dmaPerToMem.DMA_FIFOMode = DMA_FIFOMode_Disable;
  dmaPerToMem.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  dmaPerToMem.DMA_Memory0BaseAddr = (uint32_t) frame_buffer;
  dmaPerToMem.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  dmaPerToMem.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  dmaPerToMem.DMA_MemoryInc = DMA_MemoryInc_Enable;
  dmaPerToMem.DMA_Mode = DMA_Mode_Normal;
  dmaPerToMem.DMA_PeripheralBaseAddr = (uint32_t) (&GPIOC->IDR);
  dmaPerToMem.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  dmaPerToMem.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  dmaPerToMem.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  dmaPerToMem.DMA_Priority = DMA_Priority_Medium;
  DMA_Init(DMA2_Stream1, &dmaPerToMem);

  DMA_ITConfig(DMA2_Stream1, DMA_IT_TC, ENABLE);
  //DMA_Cmd(DMA2_Stream1, ENABLE);
  //DMA2 - Interrupt
  //nvic.NVIC_IRQChannel = DMA2_Stream1_IRQn;
  //nvic.NVIC_IRQChannelCmd = ENABLE;
  //nvic.NVIC_IRQChannelPreemptionPriority = 10;
  //nvic.NVIC_IRQChannelSubPriority = 10;
  //NVIC_Init(&nvic);
}

和主循环：

int main(void)
{

  SystemInit();

  uint8_t value = 10;
  uint8_t next = 0;
  uint8_t k = 0;


  TimerAndDMAConfigure();

  DMA_Cmd(DMA2_Stream2, DISABLE);
  while (DMA2_Stream2->CR & DMA_SxCR_EN);

  DMA_Cmd(DMA2_Stream1, ENABLE);
  while(1){
    DMA_Cmd(DMA2_Stream1, ENABLE);
    while(DMA_GetFlagStatus(DMA2_Stream1, DMA_FLAG_TCIF1) == RESET){
      continue;
    }
    for(int i = k; i<k + 10; i++){
      value = frame_buffer[i];
      next = value;
    }
    k+=1;
    if(k==18)k=0;
    DMA_ClearFlag(DMA2_Stream1, DMA_FLAG_FEIF1|DMA_FLAG_DMEIF1|DMA_FLAG_TEIF1|DMA_FLAG_HTIF1|DMA_FLAG_TCIF1);

    DMA_Cmd(DMA2_Stream2, DISABLE);
    while (DMA2_Stream2->CR & DMA_SxCR_EN);
    Delay(10);
  }
}

DMA传输仅运行一次

0 个答案: