F3 差分ADC 输入短路，输出居然是0x07FF?

uzufk

STM32F3探索套件 差分ADC  输入短路，输出居然是0x07FF?
找了好几天原因没找到，那位了解，告诉一声！
单端方式试过，没有问题。
以下是我测试的程序：
ADC配置部分
ADC_InitTypeDef       ADC_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  GPIO_InitTypeDef    GPIO_InitStructure;
 
   /* Configure the ADC clock */
  RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div2);
 
  /* Enable ADC1 clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);
 
   /* ADC Channel configuration */
   /* GPIOC Periph clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
 
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
  /* Configure ADC Channel7 as analog input */
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
// GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
// GPIO_Init(GPIOC, &GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
  ADC_StructInit(&ADC_InitStructure);
  /* Calibration procedure */
  ADC_VoltageRegulatorCmd(ADC1, ENABLE);
 
  /* Insert delay equal to 10 ¦Ìs */
  Delay(10);
 
    
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;                                                                   
  ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode;                   
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;            
  ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;                 
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = 0;         
 
  ADC_CommonInit(ADC1, &ADC_CommonInitStructure);
 
  ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Enable;
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0;        
  ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable;  
  ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable; 
  ADC_InitStructure.ADC_NbrOfRegChannel = 1;
  ADC_Init(ADC1, &ADC_InitStructure);
 
  /* ADC1 regular channel7 and channel8 configuration */
//   ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 1, ADC_SampleTime_7Cycles5);
//   ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 2, ADC_SampleTime_7Cycles5);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_7Cycles5);
//   ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_7Cycles5);
 
  /* Select the differetiel mode for Channel 7 */
  ADC_SelectDifferentialMode(ADC1, ADC_Channel_1, ENABLE);
 
 ADC_SetChannelOffset1(ADC1,ADC_Channel_1,0);
 ADC_SetChannelOffset1(ADC1,ADC_Channel_2,0);
 ADC_ChannelOffset1Cmd(ADC1,ENABLE);
 
  ADC_SelectCalibrationMode(ADC1, ADC_CalibrationMode_Differential);
  ADC_StartCalibration(ADC1);
 
  while(ADC_GetCalibrationStatus(ADC1) != RESET );
  calibration_value = ADC_GetCalibrationValue(ADC1);
  
  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);
 
  /* wait for ADRDY */
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_RDY));
 
  /* Start ADC1 Software Conversion */
  ADC_StartConversion(ADC1);
//
 

wambob

没人回复，楼主解决了吗