天然气ADC数据采集代码问题

adc567

可以在串口显示，但都是0值，有高手解答一下么？


#include"mq4.h"


__IO uint16_t ADC_ConvertedValue;
#define ADC1_DR_Address   ((uint32_t)0x4001244C)


void  Adc_Init(void)
{        
        GPIO_InitTypeDef GPIO_InitStructure;
        ADC_InitTypeDef ADC_InitStructure;
        DMA_InitTypeDef DMA_InitStructure;
       
  //ê1ÄüGPIOA1oíADC1í¨μàê±Öó
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1        , ENABLE );
        //ê1ÄüDMA1ê±Öó
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE );

        RCC_ADCCLKConfig(RCC_PCLK2_Div6);   //éèÖÃADC·ÖÆμòò×ó6 72M/6=12,ADC×î′óê±¼ä2»Äü3¬1y14M


        //PA1 ×÷ÎaÄ￡Äaí¨μàêäèëòy½Å￡¬2»DèòaéèÖÃËùÂê                        
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;                //Ä￡Äaêäèëòy½Å
        GPIO_Init(GPIOA, &GPIO_InitStructure);
       
        DMA_DeInit(DMA1_Channel1);//¸′λDMA1í¨μà1
       
        DMA_InitStructure.DMA_PeripheralBaseAddr=ADC1_DR_Address;//ADC1êy¾YμØÖ·
        DMA_InitStructure.DMA_MemoryBaseAddr=(u32)&ADC_ConvertedValue;//±￡′æêy¾YÄú′æμØÖ·
        DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;//íaéè×÷Îaêy¾Y′«êäμÄà′Ô′
        DMA_InitStructure.DMA_BufferSize=1;//DMA»o′æμ￥λÎa1￡»
        DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;//íaéèμØÖ·1춨
        DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Disable;//Äú′æμØÖ·1춨
        DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;//íaéèêy¾Y×Ö½úÎa°ë×Ö
        DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;//Äú′æêy¾Y×Ö½úÎa°ë×Ö
        DMA_InitStructure.DMA_Mode=DMA_Mode_Circular ;//Ñ-»·′«êä
        DMA_InitStructure.DMA_Priority=DMA_Priority_High;//DMA1í¨μà1′«ê伶¸ß
        DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;//·ÇÄú′æμ½Äú′æ′«êä
        DMA_Init(DMA1_Channel1,&DMA_InitStructure);
       
        DMA_Cmd(DMA1_Channel1, ENABLE);//ê1ÄüDMA


        ADC_DeInit(ADC1);  //¸′λADC1


        ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;        //ADC1¤×÷Ä￡ê½:ADC1oíADC21¤×÷Ôú¶àá￠Ä￡ê½
        ADC_InitStructure.ADC_ScanConvMode = DISABLE;        //Ä￡êy×a»»1¤×÷Ôúμ￥í¨μàÄ￡ê½
        ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;        //Ä￡êy×a»»1¤×÷Ôúμ￥′Î×a»»Ä￡ê½
        ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;        //×a»»óéèí¼t¶ø2»êÇía2¿′￥·￠Æô¶ˉ
        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;        //ADCêy¾Yóò¶ÔÆë
        ADC_InitStructure.ADC_NbrOfChannel = 1;        //Ë3Dò½øDD1æÔò×a»»μÄADCí¨μàμÄêyÄ¿
        ADC_Init(ADC1, &ADC_InitStructure);        //¸ù¾YADC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèADCxμļÄ′æÆ÷
       
  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5 );        //ADC1,ADCí¨μà,2éÑùê±¼äÎa239.5ÖüÆú
        ADC_Cmd(ADC1, ENABLE);        //ê1ÄüÖ¸¶¨μÄADC1
       
        ADC_ResetCalibration(ADC1);        //ê1Äü¸′λD￡×¼  
        while(ADC_GetResetCalibrationStatus(ADC1));        //μè′y¸′λD￡×¼½áêø
        ADC_StartCalibration(ADC1);         //¿aÆôADD￡×¼
        while(ADC_GetCalibrationStatus(ADC1)); //μè′yD￡×¼½áêø
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);                //ê1ÄüÖ¸¶¨μÄADC1μÄèí¼t×a»»Æô¶ˉ1|Äü
}