为什么我写的ADC多通道采集读太对，没有用DMA

1756143812 · 发表于 2014-3-30 21:32:54

//GPIO 的初始化
void ADC_GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //????????
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
//ADC的初始化
void ADC_init()
{
ADC_InitTypeDef ADC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_ADC1,ENABLE);
//RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE); //????DMA?????¨??
ADC_DeInit(ADC1);         //
RCC_ADCCLKConfig(RCC_PCLK2_Div6);                 //72/6=12M
ADC_InitStructure.ADC_Mode=ADC_Mode_Independent; //adc1&ADC2?à??????
ADC_InitStructure.ADC_ScanConvMode=ENABLE;     //???÷????
ADC_InitStructure.ADC_ContinuousConvMode=ENABLE;//????×???
ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None; //??·??????????í????·?
ADC_InitStructure.ADC_DataAlign=ADC_DataAlign_Right; //·?????16??
ADC_InitStructure.ADC_NbrOfChannel=3;                 //????×????¨??
ADC_Init(ADC1,&ADC_InitStructure);
///////////////////////////////////////////////////////////
ADC_RegularChannelConfig(ADC1,ADC_Channel_0,1,ADC_SampleTime_55Cycles5); //×????±????55.5
ADC_RegularChannelConfig(ADC1,ADC_Channel_1,2,ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1,ADC_Channel_2,3,ADC_SampleTime_55Cycles5);
//ADC_DMACmd(ADC1,ENABLE);    //?¨??????
ADC_Cmd(ADC1,ENABLE);     //?????????????é
ADC_ResetCalibration(ADC1); //??????×??????÷
while(ADC_GetResetCalibrationStatus(ADC1)); //??????×??????ê??
printf("\r\n ADC_GetResetCalibrationStatus(ADC1) is OK !!!!\r\n");
ADC_StartCalibration(ADC1);    //??????×?
while(ADC_GetCalibrationStatus(ADC1)); //??????×??ê??
printf("\r\n    ADC_StartCalibration(ADC1) is OK !!!\r\n");
ADC_SoftwareStartConvCmd(ADC1,ENABLE); //????×???
}
//接受的程序
void ADCchange(vu16 *a,u8 ADC_Channel)
{

while(!ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC));
switch(ADC_Channel)
{
case ADC_Channel_0:
*a=(float)(ADC_GetConversionValue(ADC1))/4095*3.3;
break;
case ADC_Channel_1:
*a=(float)(ADC_GetConversionValue(ADC1))/4095*3.3;
break;
case ADC_Channel_2:
*a=(float)(ADC_GetConversionValue(ADC1))/4095*3.3;
break;
}
}

//主函数
while(10)
   {
  //printf("adff");
    ADCchange(&a,ADC_Channel_0);
  printf("\r\n a=%d",a);
  ADCchange(&b,ADC_Channel_1);
  printf("\r\n b=%d",b);
  ADCchange(&c,ADC_Channel_2);
  printf("\r\n c=%d",c);
  //delay(0xffffff);
    //Display();