求助：ADC开始采集的几个数据不对 这是怎么回事

void ADC_Configuration(void)

{

        ADC_InitTypeDef ADC_InitStructure; 

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);



        ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; 

//        ADC_InitStructure.ADC_ScanConvMode = DISABLE; //¹Ø±ÕͨµÀɨÃèģʽ

        ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //×¢ÒⲻҪʹÓóÖÐøת»»Ä£Ê½£¬·ñÔòÖ»Òª´¥·¢Ò»´Î£¬//ºóÐøµÄת»»¾Í»áÓÀ²»Í£Ðª£¨³ý·ÇCONTÇå0£©£¬ÕâÑùµÚÒ»´ÎÒÔºóµÄADC£¬¾Í²»ÊÇÓÉTIM2_CC2À´´¥·¢ÁË

        ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;

        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

//  ADC_InitStructure.ADC_NbrOfChannel = 1; 

        switch(dev.ADinfo.AD_CHN)

    {

        case 0x01:

        case 0x02:

            ADC_InitStructure.ADC_NbrOfChannel = 1; 

            ADC_InitStructure.ADC_ScanConvMode = DISABLE;

            break;

        case 0x03:

            ADC_InitStructure.ADC_NbrOfChannel = 2;

            ADC_InitStructure.ADC_ScanConvMode = ENABLE;

            break;

    }

        ADC_Init(ADC1, &ADC_InitStructure);



        RCC_ADCCLKConfig(RCC_PCLK2_Div6);//ÅäÖÃʱÖÓ(12MHz),ÔÚRCCÀïÃ滹ӦÅäÖÃAPB2=AHBʱÖÓ72MHz£¬



        switch(dev.ADinfo.AD_CHN)

    {

        case 0x01:

            ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_1Cycles5);  

            break;

        case 0x02:

            ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 1, ADC_SampleTime_1Cycles5);  

            break;

        case 0x03:

            ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_1Cycles5);  

            ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 2, ADC_SampleTime_1Cycles5);  

            break;

    }

        ADC_Cmd(ADC1,ENABLE);

        ADC_DMACmd(ADC1,ENABLE);



        //        ADC_ITConfig(ADC1,ADC_IT_EOC,ENABLE);



        ADC_ResetCalibration(ADC1);

        while(ADC_GetResetCalibrationStatus(ADC1));

        ADC_StartCalibration(ADC1);                                          //Start Calibration register

        while(ADC_GetCalibrationStatus(ADC1));                         

        ADC_ExternalTrigConvCmd(ADC1, ENABLE);                        

}

void DMA_Configuration(void)

{

        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);



        DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;

        DMA_InitStructure.DMA_MemoryBaseAddr = (u32)membuf1;

        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

        DMA_InitStructure.DMA_BufferSize = 256;

        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

        DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

        DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;

        DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

        DMA_Init(DMA1_Channel1, &DMA_InitStructure);



        DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);



        DMA_Cmd(DMA1_Channel1, ENABLE);



}

void TIM2_Configuration(void)

{

        TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

        TIM_OCInitTypeDef TIM_OCInitStructure;

        /* Enable GPIOA, GPIOC, ADC1 and TIM1 clock */

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//200Hz,   72M/200=360000   

//        TIM_TimeBaseStructure.TIM_Period = 500;//ÉèÖÃ5msÒ»´ÎTIM2±È½ÏµÄÖÜÆÚ

           TIM_TimeBaseStructure.TIM_Period = dev.ADinfo.AD_sample * 10 - 1;  //*100ºó±äΪms



        TIM_TimeBaseStructure.TIM_Prescaler = 720-1;//ϵͳÖ÷Ƶ72M£¬ÕâÀïÏ൱ÓÚ100KµÄ¶¨Ê±Æ÷2ʱÖÓ 100KHz = 10us

        TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;

        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

        TIM_TimeBaseInit(TIM2, & TIM_TimeBaseStructure);



        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//ÏÂÃæÏêϸ˵Ã÷

        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//TIM_OutputState_Disable;

        TIM_OCInitStructure.TIM_Pulse = 5;

        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//Èç¹ûÊÇPWM1ҪΪLow£¬PWM2ÔòΪHigh

        TIM_OC2Init(TIM2, & TIM_OCInitStructure);



        //        TIM_Cmd(TIM2, ENABLE);



        TIM_InternalClockConfig(TIM2);

        TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);

        TIM_UpdateDisableConfig(TIM2, DISABLE);



}