ADC转换的电压值通过DMA方式传送到内存，程序是在原子哥的AD实验上改的，可是采集不了电压，求指导，谢谢！

伊轩海

//主函数main.c
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "lcd.h"
#include "adc.h"

extern u16 ADC_Value[10];//数组存放ADC的值

 int main(void)
 { 
u16 adcx;
float temp;
 
delay_init();     //???±??????????  
uart_init(9600); //?®??????????9600
LED_Init();   //????????LED??????????????
  LCD_Init();
DMA_Config();
  Adc_Init(ADC_Channel_2);   //ADC??????  

POINT_COLOR=RED;//?è??×??????ì?? 
LCD_ShowString(60,50,200,16,16,"Mini STM32");
LCD_ShowString(60,70,200,16,16,"ADC TEST");
LCD_ShowString(60,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(60,110,200,16,16,"2014/3/9");
//
POINT_COLOR=BLUE;//
LCD_ShowString(60,130,200,16,16,"ADC_CH0_VAL:");      
LCD_ShowString(60,150,200,16,16,"ADC_CH0_VOL:0.000V");    
while(1)
{
adcx=Get_Adc_Average(10);
LCD_ShowxNum(156,130,adcx,4,16,0);//????ADC????
printf("????ADC????\r\n");
printf("%d\r\n",adcx);
temp=(float)adcx*(3.3/4096);
adcx=temp;//????????·?
LCD_ShowxNum(156,150,adcx,1,16,0);//?????????? ??????·?
printf("??????????\r\n");
printf("%f\r\n",temp);
printf("\r\n\r\n");//????????
temp-=adcx;//????????·?
temp*=1000;
LCD_ShowxNum(172,150,temp,3,16,0x80);//?????????? ??????·?
LED0=!LED0;
delay_ms(3000);
}    
}

//AD转换、DMA方式传送ad.c
 #include "adc.h"
 #include "delay.h"

u16 ADC_Value[10];

//初始化DMA
//
void DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
DMA_DeInit(DMA1_Channel1);

DMA_InitStructure.DMA_PeripheralBaseAddr=(u32)&ADC1->DR;
DMA_InitStructure.DMA_MemoryBaseAddr=(u32)ADC_Value;

DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize=10;

DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc=DMA_PeripheralInc_Enable;

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_High;
DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;

DMA_Init(DMA1_Channel1,&DMA_InitStructure);
DMA_Cmd(DMA1_Channel1,ENABLE);
}

//初始化ADC
//
void  Adc_Init(u8 ch)
{
ADC_InitTypeDef ADC_InitStructure; 
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1, ENABLE );  
//????ADC1?¨???±??
 
RCC_ADCCLKConfig(RCC_PCLK2_Div6);   //?è??ADC·????ò×?6 72M/6=12,ADC×??ó?±??????????14M

//PA1 ×÷???????¨??????????                         
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //????????????
GPIO_Init(GPIOA, &GPIO_InitStructure);

ADC_DeInit(ADC1);                  //????ADC1,?????è ADC1 ???????????÷???è???±????

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;             //ADC?¤×÷????:ADC1??ADC2?¤×÷??????????
ADC_InitStructure.ADC_ScanConvMode = DISABLE;                     //????×????¤×÷?????¨??????
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;                     //????×????¤×÷??????×???????
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;       //×??????í??????????????·?????
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;                  //ADC??????????
ADC_InitStructure.ADC_NbrOfChannel = 1;                              //???ò???????ò×?????ADC?¨????????

ADC_Init(ADC1, &ADC_InitStructure);                 //?ù??ADC_InitStruct?????¨???????????????èADCx???????÷   

ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 );                  //ADC1,ADC?¨??,???ù?±????239.5????

ADC_DMACmd(ADC1,ENABLE);
ADC_Cmd(ADC1, ENABLE);                 //???????¨??ADC1

ADC_ResetCalibration(ADC1);               //??????????×?  
 
while(ADC_GetResetCalibrationStatus(ADC1));                //??????????×??á??

ADC_StartCalibration(ADC1);                  //????AD??×?
 
while(ADC_GetCalibrationStatus(ADC1));                 / /??????×??á??
 
ADC_SoftwareStartConvCmd(ADC1, ENABLE);              //???????¨??ADC1???í??×???????????

}
//取平均值
u16 Get_Adc_Average(u8 times)
{
u32 temp_val=0;
u8 t;
for(t=0;t<times;t++)
{
temp_val+=ADC_Value[t];
delay_ms(5);
}
return temp_val/times;
}

正点原子

楼主参考下论坛别的网友的试试吧。