RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div6);//RCC_ADC12PLLCLK_Div1
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);
 ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
 ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode;
 ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
 ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;
 ADC_CommonInitStructure.ADC_TwoSamplingDelay = 0;
 ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable;
 ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;

 ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 1, ADC_SampleTime_7Cycles5);