STM32F105，ADC采集数据时，IO电压一样，采集数据不一样
各位大神好如题，STM32F105，DMA方式采集ADC数据，其中两路，IO口电压一样，但采集数据不一样。数据相差较大，且差值不固定。
请大神指导。
void SysInit_ADC(void)
{
ADC_InitTypeDef ADC_InitStructure;
RCC_ADCCLKConfig(RCC_PCLK2_Div2);
/* Enable ADC1*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_DeInit(ADC1);
/* Initialize the ADCx according to the ADC_InitStructure members */
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 = 7;
ADC_Init(ADC1,&ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 6, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 7, ADC_SampleTime_41Cycles5);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1,ENABLE);
/* Enable ADC1 reset calibration register */
ADC_ResetCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
/* Start ADC1 calibration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}
void SysInit_DMA(void)
{
DMA_InitTypeDef DMA_InitStructure;
/* Enable DMA1 clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* 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 = 7;
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);
}
//******************************************************************************************
//AD采集
//每10MS调用
//******************************************************************************************
void ADC_Scan(void)
{
Filter_Buf00 = (u16)(ADCConvertedValue>>2);
Filter_Buf01 = (u16)(ADCConvertedValue>>2);
Filter_Buf02 = (u16)(ADCConvertedValue>>2);
Filter_Buf03 = (u16)(ADCConvertedValue>>2);
Filter_Buf05 = (u16)(ADCConvertedValue>>2);
Filter_Buf04 = (u16)(ADCConvertedValue>>2);
Filter_Buf06 = (u16)(ADCConvertedValue>>2);
Filter_Pointer++;
if(Filter_Pointer >= 10) //去极值求平均 Filter_Remove_Extremum
{
Filter_Pointer = 0;
Aircondition.S_InTemp = Avr_Filter(Filter_Buf0,Filter_Remove_Extremum(Filter_Buf00));
// Aircondition.S_OutTemp = Avr_Filter(Filter_Buf1,Filter_Remove_Extremum(Filter_Buf01));
Aircondition.S_Def0Temp = Avr_Filter(Filter_Buf2,Filter_Remove_Extremum(Filter_Buf02));
// Aircondition.S_LNTemp = Avr_Filter(Filter_Buf3,Filter_Remove_Extremum(Filter_Buf03));
Aircondition.S_VOL = Avr_Filter(Filter_Buf4,Filter_Remove_Extremum(Filter_Buf04));
// Aircondition.S_PTC1Temp = Avr_Filter(Filter_Buf5,Filter_Remove_Extremum(Filter_Buf05));
// Aircondition.S_PTC2Temp = Avr_Filter(Filter_Buf6,Filter_Remove_Extremum(Filter_Buf06));
// ADC_AnalogToDigtal();
}
} 自己顶一下，大神速来盖楼。谢谢 换个试试看，，，，，，，，，，，， stary666 发表于 2016-7-13 16:05
换个试试看，，，，，，，，，，，，
板子换过，电位器也换过，都有这个问题。引脚电压一样，应该是软件问题。但是ADC采集数据的程序都一样的，所以有点困惑
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