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采集外部模拟信号，需要开启对应IO口，在这里我们要将IO设为模拟输入，记得不能将IO口复用

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
	GPIO_InitTypeDef GPIO_ADC_InitStruct;
	GPIO_ADC_InitStruct.GPIO_Mode=GPIO_Mode_AN;
	//GPIO_ADC_InitStruct.GPIO_OType=GPIO_OType_OD;
	GPIO_ADC_InitStruct.GPIO_Pin=GPIO_Pin_6|GPIO_Pin_7;
	GPIO_ADC_InitStruct.GPIO_PuPd=GPIO_PuPd_NOPULL;
	GPIO_ADC_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_ADC_InitStruct);

实现DMA自动转运数据，DMA配置如下：

这里将外设数据转运到内存，记得配置数据转运方向。

数据大小根据需求调整即可，切记数据存储Buff的数据类型要统一，否则会出现数据跳变或特别大。

	DMA_InitTypeDef DMA_VC_InitStructure;
	DMA_VC_InitStructure.DMA_BufferSize=2;
	DMA_VC_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;	
	DMA_VC_InitStructure.DMA_MemoryBaseAddr=(uint32_t)vc_ADC_Arr;
	DMA_VC_InitStructure.DMA_PeripheralBaseAddr=(uint32_t)(&(ADC1->DR));	
	DMA_VC_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;
	DMA_VC_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;//16bit	
	DMA_VC_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;
	DMA_VC_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;	
	DMA_VC_InitStructure.DMA_Mode=DMA_Mode_Circular;	
	DMA_VC_InitStructure.DMA_Priority=DMA_Priority_High;
	DMA_VC_InitStructure.DMA_M2M=DMA_M2M_Disable;
	DMA_Init(DMA1_Channel1,&DMA_VC_InitStructure);
	DMA_Cmd(DMA1_Channel1,ENABLE);

	ADC_DeInit(ADC1);
	ADC_ClockModeConfig(ADC1,ADC_ClockMode_SynClkDiv4);	
	ADC_InitTypeDef ADC_VC_InitStruct;
	ADC_StructInit(&ADC_VC_InitStruct); 
	ADC_VC_InitStruct.ADC_Resolution=ADC_Resolution_12b;	
	ADC_VC_InitStruct.ADC_DataAlign=ADC_DataAlign_Right;
//	ADC_VC_InitStruct.ADC_ExternalTrigConv=DISABLE;
	ADC_VC_InitStruct.ADC_ExternalTrigConvEdge=ADC_ExternalTrigConvEdge_None;
	ADC_VC_InitStruct.ADC_ContinuousConvMode=ENABLE;
	ADC_VC_InitStruct.ADC_ScanDirection=ADC_ScanDirection_Upward;
	ADC_Init(ADC1,&ADC_VC_InitStruct);	
	ADC_ChannelConfig(ADC1,ADC_Channel_6,ADC_SampleTime_239_5Cycles);
	ADC_ChannelConfig(ADC1,ADC_Channel_7,ADC_SampleTime_239_5Cycles);	
	ADC_GetCalibrationFactor(ADC1);
	ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);	
	ADC_DMACmd(ADC1,ENABLE);	
	ADC_Cmd(ADC1,ENABLE);	
	//ADC_ContinuousModeCmd(ADC1,ENABLE);
	ADC_StartOfConversion(ADC1); //开启所选通道的转换