stm32f107 ADC启动软件触发，输入引脚就有1.66V

只看该作者 · 2015-4-12 10:26

stm32f107 ADC启动软件触发，输入引脚就有1.66V,不知为何？使用 ADC10通道，PC0引脚，DMA1传送数据
更换其他通道（ADC4, PA4）也是同样的现像，各位大侠帮看看，多谢！

只看该作者 · 2015-4-12 13:28

哪位大侠遇见过啊

只看该作者 · 2015-4-12 13:35

这是相关配置

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);//ADC1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);//GPIOC
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);//DMA1
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //ADC12MHz //PC0ADC
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC,&GPIO_InitStructure);

DMA_DeInit(DMA1_Channel1);
//DMA
DMA_InitStructure.DMA_PeripheralBaseAddr= ADC1_DR_Address; //
DMA_InitStructure.DMA_MemoryBaseAddr= (u32)&ADCConvertedValue; //
DMA_InitStructure.DMA_DIR= DMA_DIR_PeripheralSRC; //DMA
DMA_InitStructure.DMA_BufferSize = 1; //????
DMA_InitStructure.DMA_PeripheralInc= DMA_PeripheralInc_Disable;//
DMA_InitStructure.DMA_MemoryInc= DMA_MemoryInc_Disable; //
DMA_InitStructure.DMA_PeripheralDataSize= DMA_PeripheralDataSize_HalfWord;//
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMA
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //
DMA_Init(DMA1_Channel1,&DMA_InitStructure);//
DMA_Cmd(DMA1_Channel1,ENABLE); //

ADC_DeInit(ADC1);//

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 = 1;

ADC_Init(ADC1,&ADC_InitStructure);

//
ADC_RegularChannelConfig(ADC1,ADC_Channel_10,1,ADC_SampleTime_55Cycles5);
ADC_DMACmd(ADC1,ENABLE);//
ADC_Cmd(ADC1,ENABLE);//

ADC_ResetCalibration(ADC1);//
while(ADC_GetResetCalibrationStatus(ADC1));

ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));

ADC_SoftwareStartConvCmd(ADC1,ENABLE);//Ö´ÐÐ´ËÐÐºó£¬PC0=1.66V £¨PC0Ðü¿ÕÎ´½ÓÈÎºÎ¶«Î÷)£???????©