STM32F030多路ADC采集有问题

include · 发表于 2016-4-12 16:27:26

hi，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]

小小怪 · 发表于 2016-4-12 16:27:27

本帖最后由小小怪于 2016-4-24 10:46 编辑

include 发表于 2016-4-18 16:59
也是用的这个芯片么？
把你代码贴出来看下。

这个是解决的了。忙着搞毕设没时间，现在补贴上  。。
读RegularConvData_Tab数组就行了，添加通道注意要配置数组与DMA的缓存大小。

[mw_shl_code=c,true]#include "adc.h"

#define ADC1_DR_Address    0x40012440
__IO uint16_t RegularConvData_Tab[2];

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
void ADC1_DMA_Init(void)
{
  ADC_InitTypeDef    ADC_InitStruct;
  DMA_InitTypeDef    DMA_InitStruct;
      GPIO_InitTypeDef GPIO_InitStruct;


      /* 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);

  /* Configure PA.01  as analog input */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
  GPIO_Init(GPIOA, &GPIO_InitStruct);
  /* ADC1 DeInit */
  ADC_DeInit(ADC1);
  RCC_ADCCLKConfig(RCC_ADCCLK_PCLK_Div4);

  /* 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 = 2;
  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_Upward;
  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_Channel_1, ADC_SampleTime_71_5Cycles);
  /* ADC Calibration */
  ADC_GetCalibrationFactor(ADC1);

  /* 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);
}[/mw_shl_code]

xp1179926265 · 发表于 2016-4-12 18:54:27

你代码上分频优点高吧，不能高于14M的，用6分频试试

include · 发表于 2016-4-13 16:26:36

xp1179926265 发表于 2016-4-12 18:54
你代码上分频优点高吧，不能高于14M的，用6分频试试

hi，谢谢您的回复，但是把分频改了之后还是会有这个情况得！~~~
每次接上一个通道，另外一个通道采集到的电压会和原来的采样值不一样

小小怪 · 发表于 2016-4-16 11:47:49

也是奇葩，开启多个通道的时候采样周期239_5没问题，但是改变采样周期的时候通道序号就乱了，数值是能对上。我没用到DMA.

include · 发表于 2016-4-18 16:59:06

小小怪发表于 2016-4-16 11:47
也是奇葩，开启多个通道的时候采样周期239_5没问题，但是改变采样周期的时候通道序号就乱了，数值是能对上 ...

也是用的这个芯片么？
把你代码贴出来看下。

祭念草 · 发表于 2018-3-31 02:08:37

一开始我也弄了好久，我总共要采集4路AD，4路单独采集都没有问题，同时开启只有第一路是正确的，后面3路都是在随机跳。后来在csdn上发现这篇帖子，关键问题在于这个寄存器，“CHSELR”，详细建议看原帖子。https://blog.csdn.net/mrlixirong/article/details/78930275