//ADC1,ADC通道x,规则采样顺序值为y,采样时间为239.5周期
  ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_16Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_16Cycles);
 ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 3, ADC_SampleTime_16Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 4, ADC_SampleTime_16Cycles)
设为ADC_SampleTime_16Cycles会有干扰！！