030F4ADC使用遇问题

只看该作者 · 2017-5-19 16:29

我用了4个通道，DMA方式采样，现在问题是：有时上电后030F4的AD部分运行不正常，在没有外界信号的情况下，AD通道对应引脚电压会近2V，至少要到1.5V或以上，出来的AD码也很大，而有时是正常的，不知为什么，求指点，程序如下：
void ADC1_DMA_Init(void)
{
ADC_InitTypeDef    ADC_InitStruct;
DMA_InitTypeDef    DMA_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
   /* ADC1 DeInit */
ADC_DeInit(ADC1);
/* ADC1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* DMA1 clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

/* Configure PA.01  as analog input */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStruct);

/* Configure PB.00 PB.01  as analog input */
GPIO_InitStruct.GPIO_Pin  = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOB, &GPIO_InitStruct);

/* DMA1 Channel1 Config */
DMA_DeInit(DMA1_Channel1);
DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)&RegularConvData_Tab;
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStruct.DMA_BufferSize =4;
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
DMA_InitStruct.DMA_Priority = DMA_Priority_High;
DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStruct);
/* DMA1 Channel1 enable */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADC DMA request in circular mode */
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);
/* Enable ADC_DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Initialize ADC structure */
ADC_StructInit(&ADC_InitStruct);
/* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits  */
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Backward;
ADC_Init(ADC1, &ADC_InitStruct);

// /* Convert the ADC1 temperature sensor  with 55.5 Cycles as sampling time */
// ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor , ADC_SampleTime_55_5Cycles);
// ADC_TempSensorCmd(ENABLE);

/* Convert the ADC1 Vref  with 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_0  , ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_1  , ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_8  , ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_9  , ADC_SampleTime_55_5Cycles);
// ADC_VrefintCmd(ENABLE);
/* ADC Calibration */
ADC_GetCalibrationFactor(ADC1);
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);

/* Wait the ADCEN falg */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));

/* ADC1 regular Software Start Conv */
ADC_StartOfConversion(ADC1);
}

只看该作者 · 2017-5-20 13:35

自己顶一下

只看该作者 · 2017-5-20 15:56

现在发现，如果不连续转换，还算好用，但跳动的厉害，另外，零飘也大，没信号时有230个码上一，不知为什么。
AD初始化要改成这样，才能用，但还不算好用。
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStruct.ADC_ContinuousConvMode = DISABLE; //不连续转换，只转换一次
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Backward;
ADC_Init(ADC1, &ADC_InitStruct);