F407 ADC定时采样后DMA自动传输错误

只看该作者 · 2023-9-27 10:46

下面是程序，请论坛大神指导一下。

static void ADC2_DMA_Config(void)
{
  ADC_InitTypeDef    ADC_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  DMA_InitTypeDef    DMA_InitStructure;
  GPIO_InitTypeDef    GPIO_InitStructure;

  /* Enable ADC3, DMA2 and GPIO clocks ****************************************/
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE);             //DMA2 GPIOA时钟使能
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);             //ADC2时钟使能

      /* Configure ADC3 Channel13 pin as analog input ******************************/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;                      //PA6
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;             //模拟输入
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;             //无上下拉输出
      GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

      DMA_DeInit(DMA2_Stream2);
  /* DMA2 Stream0 channel2 configuration **************************************/
  DMA_InitStructure.DMA_Channel = DMA_Channel_2;             //通道2
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &(ADC2->DR);             //外设地址
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) &ADCoverVaule;             //内存地址
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;             //DMA方向,外设到内存
  DMA_InitStructure.DMA_BufferSize = 1;             //数据量
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;             //外设不递增
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;             //内存递增
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;             //外设半字传输
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;             //内存半字接收
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;             //循环模式
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;             //高优先级
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;             //FIFO模式管
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;             //FIFO半工
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;             //内存BURST单次
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;             //外设BURST单次
  DMA_Init(DMA2_Stream2, &DMA_InitStructure);             //初始化DMA


  /* ADC Common Init **********************************************************/
      ADC_DeInit();             //ADC复位

  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;       //独立模式
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div6;             //6分频
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;             //DMA模式
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;             //两次传送间隔5时钟周期
  ADC_CommonInit(&ADC_CommonInitStructure);             //ADC通用初始化

  /* ADC2 Init ****************************************************************/
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;             //精度12位
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;             //扫描模式关闭
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;             //连续模式关闭
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;             //外设上升沿激活
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;             //T2 TRGO激活
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;             //右对齐
  ADC_InitStructure.ADC_NbrOfConversion = 1;             //1个通道
  ADC_Init(ADC2, &ADC_InitStructure);             //初始化ADC2

  /* ADC3 regular channel13 configuration *************************************/
  ADC_RegularChannelConfig(ADC2, ADC_Channel_6, 1, ADC_SampleTime_480Cycles);             //ADC2通道6 规则排序1

/* Enable DMA request after last transfer (Single-ADC mode) */

  /* Enable ADC3 DMA */

  /* Enable ADC3 */
  DMA_Cmd(DMA2_Stream2, ENABLE);             //使能DMA
  ADC_DMARequestAfterLastTransferCmd(ADC2, ENABLE);             //转换完毕DMA自动请求
  ADC_Cmd(ADC2, ENABLE);             //ADC使能

      ADC_DMACmd(ADC2, ENABLE);             //ADC-DMA使能这行不使能时 ADC2->DR值是刷新的，使能后就失效了


      ADC_SoftwareStartConv(ADC2);
}

void Tim2_Init_TRGO(u16 Period,u16 Prescaler)
{
      TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);


      TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
      TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Down;
      TIM_TimeBaseInitStructure.TIM_Period=Period;
      TIM_TimeBaseInitStructure.TIM_Prescaler=Prescaler;

      TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure);


      TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update);
      TIM_Cmd(TIM2,ENABLE);

}

int main(void)
{

      ADC2_DMA_Config();
      Tim2_Init_TRGO(26250-1,0);
  while (1)
  {

  }
}