DMA读取方式很适合高频率的ADC采样信号。

     ADC的DMA读取方式，其实和上一篇的中断读取方式差不多，初始化代码更是相似。初始化代码如下：

static void ADC_GPIO_Config(void)

{

  GPIO_InitTypeDef  GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //ʹÄÜPB,PE¶Ë¿ÚʱÖÓ

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;

GPIO_Init(GPIOA, &GPIO_InitStructure);

}

static void ADC_Mode_Config(void)

{

  ADC_InitTypeDef ADC_InitStructure;

  DMA_InitTypeDef DMA_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);

DMA_DeInit(DMA1_Channel1);

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

DMA_InitStructure.DMA_MemoryBaseAddr=(uint32_t)&adcconverdata;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize=1;

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;

DMA_InitStructure.DMA_PeripheralInc =DMA_PeripheralInc_Disable ;

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;

DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;

DMA_Init(DMA1_Channel1,&DMA_InitStructure);

DMA_Cmd(DMA1_Channel1,ENABLE);

ADC_DeInit(ADC1);

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

ADC_InitStructure.ADC_ScanConvMode=DISABLE;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfChannel=ADC_Channel_1;

ADC_Init(ADC1,&ADC_InitStructure);

RCC_ADCCLKConfig(RCC_PCLK2_Div8); 

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5);

ADC_DMACmd(ADC1,ENABLE);

  ADC_Cmd(ADC1,ENABLE);

ADC_ResetCalibration(ADC1);

while(ADC_GetResetCalibrationStatus(ADC1));

ADC_StartCalibration(ADC1);

while(ADC_GetCalibrationStatus(ADC1));

ADC_SoftwareStartConvCmd(ADC1,ENABLE);

}

void ADC_InitConfig(void)

{

  ADC_GPIO_Config();

  ADC_Mode_Config();

}

上面代码写的很清楚了，虽然没有标注，相信也能看懂，代码很简单，就不做解释了