STM32F103VE的DMA测输入电压ADC某点电压不准

//DMA方式ADC转换
void AdcInit_DMA(void)
{

//ADC相关管脚初始化
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure PB.00 PB.01 (ADC Channel 08) as analog input -------------------------*/
//GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOB, &GPIO_InitStructure);

/* Configure PA.00 PA.01 PA.07 PA.06 as analog input -------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure PC.00-05 as analog input -------------------------*/
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_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);

/* DMA1 channel1 configuration ----------------------------------------------*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 16;
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_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);

/* Enable DMA1 channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);

/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 16;
ADC_Init(ADC1, &ADC_InitStructure);

/* ADC1 regular channel14 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_71Cycles5); //AD输出1通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_71Cycles5); //AD输出2通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_71Cycles5); //AD输出3通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_71Cycles5); //AD输出4通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 5, ADC_SampleTime_71Cycles5); //AD输出5通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 6, ADC_SampleTime_71Cycles5); //AD输出6通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 7, ADC_SampleTime_71Cycles5); //AD输出7通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 8, ADC_SampleTime_71Cycles5); //AD输出8通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 9, ADC_SampleTime_71Cycles5); //AD输出9通道
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 10, ADC_SampleTime_71Cycles5); //
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 11, ADC_SampleTime_71Cycles5); //
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 12, ADC_SampleTime_71Cycles5); //
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 13, ADC_SampleTime_71Cycles5); //


ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 14, ADC_SampleTime_71Cycles5); //
ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 15, ADC_SampleTime_71Cycles5); //
ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 16, ADC_SampleTime_239Cycles5); //


/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);

/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);

/* Enable ADC1 reset calibaration register */
ADC_ResetCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));

/* Start ADC1 calibaration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));

/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);

ADC_TempSensorVrefintCmd(ENABLE); //温度检测允许

/* Enable ADC1 EOC interupt */
ADC_ITConfig(ADC1, ADC_IT_EOC, ENABLE);
}

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;这里只有6个

你的ADC总共使用了14个通道，而你的DMA缓冲区却是16个通道，数据会出现交叉的。

和外围电路也是有关系的

万用表精度是多少？是否有误差。

不好意思，这段时间出差了，没有过来看。 表是5位半的。我测试了好几个板子，都是这个电压点不准，万用表测的结果是线性的，而单片机一到这个电压点就不准了，过了这个点又准了。关于通道的问题，因为这个底层不是我写的，我再研究一下，谢谢回复。

外围很简单，我就弄了一个滑动变阻器，一边滑动，一边用万用表测电压，一边看单片机读出的电压