void  Adc_Init(void)
{  
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1 , ENABLE );   //ʹÄÜADC1ͨµÀʱÖÓ

RCC_ADCCLKConfig(RCC_PCLK2_Div6);   //ÉèÖÃADC·ÖƵÒò×Ó6 72M/6=12,ADC×î´óʱ¼ä²»Äܳ¬¹ý14M
//PA1 ×÷ΪģÄâͨµÀÊäÈëÒý½Å                        
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;  //Ä£ÄâÊäÈëÒý½Å
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_DeInit(ADC1);  //¸´Î»ADC1,½«ÍâÉè ADC1 µÄÈ«²¿¼Ä´æÆ÷ÖØÉèΪȱʡֵ
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC¹¤×÷ģʽ:ADC1ºÍADC2¹¤×÷ÔÚ¶ÀÁ¢Ä£Ê½
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //Ä£Êýת»»¹¤×÷ÔÚµ¥Í¨µÀģʽ
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //Ä£Êýת»»¹¤×÷ÔÚµ¥´Îת»»Ä£Ê½
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //ת»»ÓÉÈí¼þ¶ø²»ÊÇÍⲿ´¥·¢Æô¶¯
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADCÊý¾ÝÓÒ¶ÔÆë
ADC_InitStructure.ADC_NbrOfChannel = 1; //˳Ðò½øÐйæÔòת»»µÄADCͨµÀµÄÊýÄ¿
ADC_Init(ADC1, &ADC_InitStructure); //¸ù¾ÝADC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèADCxµÄ¼Ä´æÆ÷   

ADC_Cmd(ADC1, ENABLE); //ʹÄÜÖ¸¶¨µÄADC1

ADC_ResetCalibration(ADC1); //ʹÄܸ´Î»Ð£×¼  
  
while(ADC_GetResetCalibrationStatus(ADC1)); //µÈ´ý¸´Î»Ð£×¼½áÊø

ADC_StartCalibration(ADC1);  //¿ªÆôADУ׼

while(ADC_GetCalibrationStatus(ADC1));  //µÈ´ýУ׼½áÊø

// ADC_SoftwareStartConvCmd(ADC1, ENABLE);  //ʹÄÜÖ¸¶¨µÄADC1µÄÈí¼þת»»Æô¶¯¹¦ÄÜ
}      
//»ñµÃADCÖµ
//ch:ͨµÀÖµ 0~3
u16 Get_Adc(u8 ch)   
{
   //ÉèÖÃÖ¸¶¨ADCµÄ¹æÔò×éͨµÀ£¬Ò»¸öÐòÁУ¬²ÉÑùʱ¼ä
ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 ); //ADC1,ADCͨµÀ,²ÉÑùʱ¼äΪ239.5ÖÜÆÚ         
  
ADC_SoftwareStartConvCmd(ADC1, ENABLE);  //ʹÄÜÖ¸¶¨µÄADC1µÄÈí¼þת»»Æô¶¯¹¦ÄÜ
  
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//µÈ´ýת»»½áÊø
return ADC_GetConversionValue(ADC1); //·µ»Ø×î½üÒ»´ÎADC1¹æÔò×éµÄת»»½á¹û
}
u16 Get_Adc_Average(u8 ch,u8 times)
{
u32 temp_val=0;
u8 t;
for(t=0;t<times;t++)
{
  temp_val+=Get_Adc(ch);
  delay_ms(5);
}
return temp_val/times;