STM32F207 两个ADC同时采样问题

fafa1 提问时间：2019-5-5 11:07 /

本帖最后由 sfd123-302670 于 2019-5-6 11:13 编辑

问题描述：有4个通道，使用两个ADC（ADC1和ADC2）同时采样，分别采样2路，采样10组数据，实际测试发现每启动一次采样，第一组数据的两个ADC1数据相同，确认是第二个ADC1的数据是错误的，接下来的9组数据都是正常的

请教：谁遇到过这样的问题？或者大侠指点一下应该怎么进一步调试确认？谢谢！

ADC和DMA配置如下：
void adc_init(void)
{
      #define ADC_CDR_ADDRESS ((uint32_t)0x40012308)
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_DMA2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);

/*GPIO初始化*/
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/*DMA初始化*/
      DMA_Cmd(DMA2_Stream0, DISABLE);
      DMA_DeInit(DMA2_Stream0);
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(ADC_CDR_ADDRESS);
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADC_Convert_Value;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = (10 * 2);
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
      DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//DMA_Mode_Circular;//使用非循环模式就好了
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(DMA2_Stream0, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream0, ENABLE);

      DMA_Cmd(DMA2_Stream2, DISABLE);
      DMA_DeInit(DMA2_Stream2);
DMA_InitStructure.DMA_Channel = DMA_Channel_1;
DMA_Init(DMA2_Stream2, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream2, ENABLE);

/*ADC初始化*/
ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_RegSimult;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);

ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 2;
ADC_Init(ADC1, &ADC_InitStructure);

ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_480Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_480Cycles);

      ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);

      ADC_Init(ADC2, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC2, ADC_Channel_0, 1, ADC_SampleTime_480Cycles);
ADC_RegularChannelConfig(ADC2, ADC_Channel_3, 2, ADC_SampleTime_480Cycles);

ADC_DMACmd(ADC2, ENABLE);
ADC_Cmd(ADC2, ENABLE);
}