正点原子 发表于 2013-8-16 10:33
解决抖动：
1，看硬件。ADC参考电压是不是稳定？输入电压的GND和VDDS越近越好（阻抗越低越好）。
2，软件。 ...

今晚测试感觉不是这样的啊！
同样你的mini学习板，使用您的例程，寄存器的很稳定，0V的时候最多是0和1之间跳动，3.3V的时候4095不会跳，用电位器，跳动也在3以内。但是用您的库函数例程0V的时候会在14到0之间跳动，3.3V的时候会在4057到4096之间跳动，以前也遇到过，以为是电源电压稳定，后来也没解决就放弃了，最近要用STM32才知道真正的原因还是软件啊！

但是还没找到解决办法。

vu16 AD_Value[N][M]; //·ADC×áDMA±ê·
vu16 After_filter[M]; //·ùóá
/***********************************************************************
瘀漀椀搀 ADC_Configuration(void)
   


±à±
±à  
×   
***********************************************************************/
void ADC_Configuration(void)
{
       
        ADC_InitTypeDef       ADC_InitStructure;
        ADC_CommonInitTypeDef ADC_CommonInitStructure;
        DMA_InitTypeDef       DMA_InitStructure;
        GPIO_InitTypeDef      GPIO_InitStructure;
       
        /* è± */
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
   
   
          GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
        GPIO_Init(GPIOC, &GPIO_InitStructure);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
        GPIO_Init(GPIOB, &GPIO_InitStructure);

        /* DMA2 Stream0 channel0 -------------------------------------------------- */
        DMA_InitStructure.DMA_Channel = DMA_Channel_0;  
        DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&ADC1->DR;  //DMAèADCù
        DMA_InitStructure.DMA_Memory0BaseAddr =(u32)&AD_Value; //DMAù·;
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
        DMA_InitStructure.DMA_BufferSize = N*M;
        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_High;
        DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
        DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
        DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
        DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
        DMA_Init(DMA2_Stream0, &DMA_InitStructure);

        /* DMA2_Stream0 enable */
        DMA_Cmd(DMA2_Stream0, ENABLE);
   
    /****************************************************************************   
          PCLK2 = HCLK / 2
          2·
          ADCCLK = PCLK2 /8 = HCLK / 8 = 168 / 8 = 21M
      ADCù Sampling Time + Conversion Time = 480 + 12 cycles = 492cyc
                    Conversion Time = 21MHz / 492cyc = 42.6ksps.
        *****************************************************************************/
   
        /* ADC Common  ----------------------------------------------------------*/
     ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
    ADC_CommonInit(&ADC_CommonInitStructure);

        /* ADC1 regular channel 12 configuration ************************************/
        ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
        ADC_InitStructure.ADC_ScanConvMode = ENABLE;
        ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
        ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
        ADC_InitStructure.ADC_NbrOfConversion = 16;
    ADC_Init(ADC1, &ADC_InitStructure);
   
     /* Enable ADC1 DMA */
    ADC_DMACmd(ADC1, ENABLE);

    /* ADC1 regular channel18 (VBAT) configuration ******************************/
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_480Cycles);         //PC0ADC_SampleTime_13Cycles5
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 2, ADC_SampleTime_480Cycles);         //PC2
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 3, ADC_SampleTime_480Cycles);         //PC3
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 4, ADC_SampleTime_480Cycles);                 //PA3
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_0,  5, ADC_SampleTime_480Cycles);                   //PA4
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_1,  6, ADC_SampleTime_480Cycles);                   //PA5
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_2,  7, ADC_SampleTime_480Cycles);                   //PA5
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_3,  8, ADC_SampleTime_480Cycles);                  //PB0
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_5,  9, ADC_SampleTime_480Cycles);                   //PB1
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_4,  10, ADC_SampleTime_480Cycles);                  //PB0
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_6,  11, ADC_SampleTime_480Cycles);                   //PB1
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_7,  12, ADC_SampleTime_480Cycles);                   //PB1
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 13, ADC_SampleTime_480Cycles);                   //PB1
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 14, ADC_SampleTime_480Cycles);                   //PB1
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_8,  15, ADC_SampleTime_480Cycles);                   //PB1
//         ADC_RegularChannelConfig(ADC1, ADC_Channel_9,  16, ADC_SampleTime_480Cycles);                   //PB1
       
       
        ADC_RegularChannelConfig(ADC1, ADC_Channel_0,  1, ADC_SampleTime_480Cycles);                   //PA4
        ADC_RegularChannelConfig(ADC1, ADC_Channel_1,  2, ADC_SampleTime_480Cycles);                   //PA5
        ADC_RegularChannelConfig(ADC1, ADC_Channel_2,  3, ADC_SampleTime_480Cycles);                   //PA5
        ADC_RegularChannelConfig(ADC1, ADC_Channel_3,  4, ADC_SampleTime_480Cycles);                  //PB0
        ADC_RegularChannelConfig(ADC1, ADC_Channel_5,  5, ADC_SampleTime_480Cycles);                   //PB1
        ADC_RegularChannelConfig(ADC1, ADC_Channel_4,  6, ADC_SampleTime_480Cycles);                  //PB0
        ADC_RegularChannelConfig(ADC1, ADC_Channel_6,  7, ADC_SampleTime_480Cycles);                   //PB1
        ADC_RegularChannelConfig(ADC1, ADC_Channel_7,  8, ADC_SampleTime_480Cycles);                   //PB1
        ADC_RegularChannelConfig(ADC1, ADC_Channel_8,  9, ADC_SampleTime_480Cycles);                   //PB1
        ADC_RegularChannelConfig(ADC1, ADC_Channel_9,  10, ADC_SampleTime_480Cycles);                   //PB1
        ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 11, ADC_SampleTime_480Cycles);         //PC0ADC_SampleTime_13Cycles5
        ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 12, ADC_SampleTime_480Cycles);         //PC2
        ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 13, ADC_SampleTime_480Cycles);         //PC3
        ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 14, ADC_SampleTime_480Cycles);                 //PA3
        ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 15, ADC_SampleTime_480Cycles);                   //PB1
        ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 16, ADC_SampleTime_480Cycles);                   //PB1
       
       
       
       
       
       
       
    /* Enable VBAT channel */
    ADC_VBATCmd(ENABLE);
   
    ADC_TempSensorVrefintCmd(ENABLE);

    /* Enable DMA request after last transfer (Single-ADC mode) */
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

    /* Enable ADC1 **************************************************************/
    ADC_Cmd(ADC1, ENABLE);
   
        /* Start ADC1 Software Conversion */
    ADC_SoftwareStartConv(ADC1);
}
我用的STM32F407VET6 16通道AD转换，每一路AD转换10次，取平均值，AD数值比较稳定。以上是代码，供参考。