stm32f407 上电后电流采不准 母线电压采样很准

dongzizhao

加220时两路电流采样数据完全不对 但母线电压很准
单15v电源供电时加电位器采样很准 不知道是怎么回事
求各位大神帮帮忙！！
#include
#include "stm32f4_discovery.h"
/*   ADC_DMA2 Macro  */
#define ADC1_DR_ADDRESS    ((uint32_t)0x4001204C)
#define ADC2_DR_ADDRESS    ((uint32_t)0x4001214C)
/***   Private Structures define   ***/
#include
ADC_InitTypeDef       ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef       DMA_InitStructure;
/*   Private variables   */
extern uint16_t ADC1ConvertedValue[4];
extern uint16_t ADC2ConvertedValue[4];
/*  ADCs configuration: triple interleaved with 5cycles delay to reach 6Msps  */
void ADC_Common_Configuration(void)
{
  /************************ ADC Common configuration **************************/
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;    
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2; 
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
  ADC_CommonInit(&ADC_CommonInitStructure);
}
/*****************ADC1 Configuration****************/
/*  Use The Channel 0,3,6,8,9,10,12,13 To Convert  */
void ADC1_Configuration(void)
{
 /*  ENABLE The ADC Clock  */
 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);  //
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);  
 ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
   ADC_InitStructure.ADC_ScanConvMode = ENABLE;       
   ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;    
   ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None；
 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1；        
   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;      
   ADC_InitStructure.ADC_NbrOfConversion = 3;//
   ADC_Init(ADC1, &ADC_InitStructure);
    /**************以上是ADC_Init函数,还要指定通道转换顺序，采样时间等************/
  
    /* ADC1 规则通道12（Channel 12）配置 */
    ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 1, ADC_SampleTime_3Cycles);//
 ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 2, ADC_SampleTime_3Cycles);//
 ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 3, ADC_SampleTime_3Cycles);//
// ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 4, ADC_SampleTime_3Cycles);//
 ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
 /* Enable ADC1 DMA */
    ADC_DMACmd(ADC1, ENABLE);   
    /* Enable ADC1 */
    ADC_Cmd(ADC1, ENABLE);     
 /* Start ADC1 Software Conversion */
   ADC_SoftwareStartConv(ADC1);   
 //ADC_ITConfig(ADC1, ADC_IT_AWD, ENABLE);   
 //ADC_ClearFlag(ADC1, ADC_FLAG_JEOC); 
    //ADC_SoftwareStartInjectedConv(ADC1);   
}
 
 

/*    DMA2_Stream0 Configuration   */
void DMA2_Configuration(void)
{
  /*  ENABLE The DMA Clock  */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);    //打开DMA2时钟
  DMA_DeInit(DMA2_Stream0);
  /* DMA2 Stream 0 channel 0 configuration */
  DMA_InitStructure.DMA_Channel = DMA_Channel_0; 
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;   
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;  
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;     
  DMA_InitStructure.DMA_BufferSize = 3;     
  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_FIFOMode = DMA_FIFOMode_Disable;        
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);
  /* DMA2_Stream0 enable */
  DMA_Cmd(DMA2_Stream0, ENABLE);
}

安

可能是分压处理没有弄好。建议用放大器来进行分压。