ADC试验中未初始化管脚，规则通道选的通道3，开启ADC3的时钟，没有开启管脚时钟，但还是能正确转换，他们之间有什么关系吗

wangqi920514 · 发表于 2015-11-4 21:25:30

void Adc_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
//GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3 , 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(GPIOB, &GPIO_InitStructure);

ADC_DeInit(ADC3); //????ADC1

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC?¤×÷????:ADC1??ADC2?¤×÷??????????
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //????×????¤×÷?????¨??????
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //????×????¤×÷??????×???????
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(ADC3, &ADC_InitStructure); //?ù??ADC_InitStruct?????¨???????????????èADCx???????÷


ADC_Cmd(ADC3, ENABLE); //???????¨??ADC1

ADC_ResetCalibration(ADC3); //??????????×?

while(ADC_GetResetCalibrationStatus(ADC3)); //??????????×??á??

ADC_StartCalibration(ADC3); //????AD??×?

while(ADC_GetCalibrationStatus(ADC3)); //??????×??á??

// ADC_SoftwareStartConvCmd(ADC1, ENABLE); //???????¨??ADC1???í??×???????????

}

while(1)
{
adcx=Get_Adc_Average(ADC_Channel_3,10);
LCD_ShowxNum(156,130,adcx,4,16,0);//????ADC????
temp=(float)adcx*(3.3/4096);
adcx=temp;
LCD_ShowxNum(156,150,adcx,1,16,0);//??????????
temp-=adcx;
temp*=1000;
LCD_ShowxNum(172,150,temp,3,16,0X80);
LED0=!LED0;
delay_ms(250);