STM32F030多路ADC采集有问题

2万 · 2024-11-12 11:40

代码如下，STM32F030多路ADC采集，当某一路的电压示数跳变了，会导致另外一个引脚的电压改变，是哪里设置的有问题么？
[mw_shl_code=c,true]void ADC1_DMA_Init1(void)
{
      ADC_InitTypeDef    ADC_InitStruct;
      DMA_InitTypeDef    DMA_InitStruct;
      GPIO_InitTypeDef GPIO_InitStruct;

      /* ADC1 DeInit */
      ADC_DeInit(ADC1);

      /* Enable  GPIOA clock */
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
      /* ADC1 Periph clock enable */
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
      /* DMA1 clock enable */
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

      RCC_ADCCLKConfig(RCC_ADCCLK_PCLK_Div4);


      /* Configure PA.1  as analog input */
      GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4 |GPIO_Pin_5 | GPIO_Pin_6 |GPIO_Pin_7;
      GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
      GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;
      GPIO_Init(GPIOA, &GPIO_InitStruct);

      /* DMA1 Channel1 Config */
      DMA_DeInit(DMA1_Channel1);
      DMA_InitStruct.DMA_PeripheralBaseAddr = (u32)&(ADC1->DR);
      DMA_InitStruct.DMA_MemoryBaseAddr = (u32)RegularConvData_Tab1;
      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);
      /*Enables the specified DMAy Channelx interrupts */
//       DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,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);

      ADC_ChannelConfig(ADC1, ADC_Channel_4, ADC_SampleTime_55_5Cycles);
      ADC_ChannelConfig(ADC1, ADC_Channel_5, ADC_SampleTime_55_5Cycles);
      ADC_ChannelConfig(ADC1, ADC_Channel_6, ADC_SampleTime_55_5Cycles);
      ADC_ChannelConfig(ADC1, ADC_Channel_7, ADC_SampleTime_55_5Cycles);

   /* ADCD￡×? */
      ADC_GetCalibrationFactor(ADC1);
   /* Enable ADC1 */
   ADC_Cmd(ADC1, ENABLE);
/*    DMA_Cmd(DMA1_Channel1, ENABLE);
   ADC_DMACmd(ADC1, ENABLE);
      ADC_Cmd(ADC1, ENABLE);
  */
   while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY));
   /* ADC1 regular Software Start Conv */
   ADC_StartOfConversion(ADC1);
}

采集：
if(DMA_GetFlagStatus(DMA1_FLAG_TC1) != RESET)
                              {
                              adc_data1[adc_count]=RegularConvData_Tab1[0];
                              adc_data2[adc_count]=RegularConvData_Tab1[1];
                              adc_data3[adc_count]=RegularConvData_Tab1[2];
                              adc_data4[adc_count]=RegularConvData_Tab1[3];
                              DMA_ClearFlag(DMA1_FLAG_TC1);
                              }[/mw_shl_code]

只看该作者 · 2024-11-12 12:07

如果您希望从最低编号的通道开始扫描，应使用ADC_ScanDirection_Forward。

只看该作者 · 2024-11-12 19:00

关于您提到的电压跳变问题，这可能是由于多个原因造成的。首先，检查您的硬件连接，确保没有短路或干扰。其次，检查其他可能影响ADC读数的外设或代码部分，比如其他中断服务程序或任务。此外，如果您在ADC转换期间更改了GPIO的配置或状态，这也可能导致问题。