c - stm32f4105x 中执行永远不会跳转到 DMA IRQHandler

Question

我正在尝试使用 DMA 事务从 STM32f401c-disco 的 STM32f4105VC 的 ADC1 获取 1000 个样本的序列。我希望 DMA 在传输完成时生成中断并停止，以免数据被覆盖。这是代码:

/* Private macro -------------------------------------------------------------*/
#define M 5
#define F_S 42000000
#define LOG_SIZE 1000
#define MEAS_PERIODS 1
#define DMA_BUFFER_SIZE 1000
/* Private variables ---------------------------------------------------------*/
__IO uint16_t uhADCxConvertedValue[DMA_BUFFER_SIZE] = {0};
__IO uint32_t uwADCxConvertedVoltage = 0;
double voltage=0;
double S=0, rms=0, F=0; // S quadratic sums, rms - the rms value, F the frequency
uint32_t N; //number of samplings
double unscaled_voltage=0;
uint32_t max_N=0, steady_N = 0;

typedef char MyString[50];
MyString Log[LOG_SIZE];



/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
static void ADC_Config(void);


void DMA2_Stream0_IRQHandler(void) {
    if(DMA_GetITStatus(DMA_STREAMx,DMA_IT_TCIF0)!=RESET) {
   DMA_ClearITPendingBit(DMA_STREAMx,DMA_STREAMx,DMA_IT_TCIF0|DMA_IT_HTIF0);
    }
}


/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s)
       before to branch to application main. 
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f4xx.c file
     */



    double R = 3.0/0xfff; //conversion ratio
    double dc_offset = 1.5;
    double ac_scaling = 0.0022;
    double mv_filter[M]={0};//moving average filter
  uint8_t wave_pos=0; //0 upper half wave, 1 lower half wave
    uint32_t i=0;
    uint8_t i_period = 1;
  /* ADC configuration */
  ADC_Config();

  /* Start ADC Software Conversion */ 
//   ADC_SoftwareStartConv(ADCx);
    ADC_SoftwareStartConv(ADCx);
  while (1) {}
}

static void ADC_Config(void)
{
  ADC_InitTypeDef       ADC_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  DMA_InitTypeDef       DMA_InitStructure;
  GPIO_InitTypeDef      GPIO_InitStructure;
    NVIC_InitTypeDef            NVIC_InitStructure;

  /* Enable ADCx, DMA and GPIO clocks ****************************************/ 
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
  RCC_AHB1PeriphClockCmd(ADCx_CHANNEL_GPIO_CLK, ENABLE);  
  RCC_APB2PeriphClockCmd(ADCx_CLK, ENABLE);

    /* Enable the DMA2 Stream0 Global Interrupt (to handle the Transfer Complete Interrupt TCIF) */
    NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* DMA2 Stream0 channel15 configuration **************************************/
  DMA_InitStructure.DMA_Channel = DMA_CHANNELx;  
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADCx_DR_ADDRESS;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&uhADCxConvertedValue[0];
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = DMA_BUFFER_SIZE;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA_STREAMx, &DMA_InitStructure);
  DMA_Cmd(DMA_STREAMx, ENABLE);

  /* Configure ADC1 Channel15 pin as analog input ******************************/
  GPIO_InitStructure.GPIO_Pin = GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIO_PORT, &GPIO_InitStructure);

  /* ADC Common Init **********************************************************/
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInit(&ADC_CommonInitStructure);

  /* ADC1 Init ****************************************************************/
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 1;
  ADC_Init(ADCx, &ADC_InitStructure);

  /* ADC1 regular channel15 configuration **************************************/
  ADC_RegularChannelConfig(ADCx, ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);

//  /* Enable DMA request after last transfer (Single-ADC mode) */
  ADC_DMARequestAfterLastTransferCmd(ADCx, ENABLE);

//   /* Enable ADC1 DMA */
  ADC_DMACmd(ADCx, ENABLE);

  /* Enable ADC1 */
  ADC_Cmd(ADCx, ENABLE);

    DMA_ITConfig(DMA_STREAMx,DMA_IT_TC,ENABLE);
}

当我调试程序一段时间后，DMA 停止，并且寄存器 DMA_LISR 中设置了标志 TCIF0 和 HTIF0，但是DMA2_Stream0_IRQHandler 函数中的断点仅被激活一次。为什么？

Answer 1

您没有正确配置 DMA 中断。您需要发送IT配置函数DMA2_Stream0。将行 DMA_ITConfig(DMA_CHANNELx, DMA_IT_TC, ENABLE); 更改为 DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);。