请高手指教AD问题

只看该作者 · 2012-1-17 16:11

程序在AD取样10次，取样结果差别很大如图

void ADC_Configuration()
{
  ADC_InitTypeDef ADC_InitStructure;
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfChannel = 2;
  ADC_Init(ADC1, &ADC_InitStructure);
  ADC_Init(ADC2, &ADC_InitStructure);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 5,ADC_SampleTime_239Cycles5);
ADC_RegularChannelConfig(ADC2,ADC_Channel_11,5,ADC_SampleTime_239Cycles5);
  ADC_Cmd(ADC1, ENABLE);
  ADC_Cmd(ADC2, ENABLE);
  while(ADC_GetResetCalibrationStatus(ADC1));//等待ADC1校准重置完成
  ADC_StartCalibration(ADC1);//开始ADC1校准
  while(ADC_GetCalibrationStatus(ADC1));//等待ADC1校准完成
  ADC_ResetCalibration(ADC2); //重置ADC1校准寄存器
  while(ADC_GetResetCalibrationStatus(ADC2));//等待ADC1校准重置完成
  ADC_StartCalibration(ADC2);//开始ADC1校准
  while(ADC_GetCalibrationStatus(ADC2));//等待ADC1校准完成
  ADC_SoftwareStartConvCmd(ADC1,ENABLE);
  ADC_SoftwareStartConvCmd(ADC2,ENABLE);
}
请高手指教