AT32F421 ADC DMA 多通道采集数据干扰

  GPIO_InitType GPIO_InitStructure;

  ADC_InitType ADC_InitStructure;

  DMA_InitType DMA_InitStructure;



  RCC_AHBPeriphClockCmd(RCC_AHBPERIPH_DMA1, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_ADC1, ENABLE);

  RCC_AHBPeriphClockCmd(AT32_ADC_GPIO_RCC_CLK, ENABLE);



  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pins = AT32_ADC_LDR_PIN | AT32_ADC_VBUS_PIN | AT32_ADC_ACC_PIN;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

  GPIO_Init(AT32_ADC_GPIO, &GPIO_InitStructure);



  /* DMA1 channel1 configuration ----------------------------------------------*/

  DMA_Reset(DMA1_Channel1);

  DMA_DefaultInitParaConfig(&DMA_InitStructure);

  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->RDOR;

  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_RegularConvertedValueTab;

  DMA_InitStructure.DMA_Direction = DMA_DIR_PERIPHERALSRC;

  DMA_InitStructure.DMA_BufferSize = 2;

  DMA_InitStructure.DMA_PeripheralInc = DMA_PERIPHERALINC_DISABLE;

  DMA_InitStructure.DMA_MemoryInc = DMA_MEMORYINC_ENABLE;

  DMA_InitStructure.DMA_PeripheralDataWidth = DMA_PERIPHERALDATAWIDTH_HALFWORD;

  DMA_InitStructure.DMA_MemoryDataWidth = DMA_MEMORYDATAWIDTH_HALFWORD;

  DMA_InitStructure.DMA_Mode = DMA_MODE_CIRCULAR;

  DMA_InitStructure.DMA_Priority = DMA_PRIORITY_HIGH;

  DMA_InitStructure.DMA_MTOM = DMA_MEMTOMEM_DISABLE;

  DMA_Init(DMA1_Channel1, &DMA_InitStructure);

  /* Enable DMA1 channel1 */

  DMA_ChannelEnable(DMA1_Channel1, ENABLE);



  /* ADC1 configuration ------------------------------------------------------*/

  ADC_StructInit(&ADC_InitStructure);

  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

  ADC_InitStructure.ADC_ScanMode = ENABLE;

  ADC_InitStructure.ADC_ContinuousMode = ENABLE;

  ADC_InitStructure.ADC_ExternalTrig = ADC_ExternalTrig_None;

  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

  ADC_InitStructure.ADC_NumOfChannel = 2;

  ADC_Init(ADC1, &ADC_InitStructure);



  /* ADC1 regular channels configuration */

  ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_13_5);

  // ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 2, ADC_SampleTime_13_5);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 2, ADC_SampleTime_13_5);

  ADC_ExternalTrigConvCtrl(ADC1, ENABLE);

  /* Enable ADC1 DMA */

  ADC_DMACtrl(ADC1, ENABLE);



  /* Enable ADC1 */

  ADC_Ctrl(ADC1, ENABLE);