STM32F2 ADC 转换错位，单次转换，请教高手

只看该作者 · 2013-1-30 11:37

每次转换，结果会转到下一次转换通道的。第一次转换的结果到了第二次里的。
u8 Init_ADC(void)
{
//if(Adc_Init_flag==0)Adc_Init_flag=1;else return 0;
  u8 i;
  ADC_InitTypeDef    ADC_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  GPIO_InitTypeDef    GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInit(&ADC_CommonInitStructure);

  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = DISABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  //ADC_RegularChannelConfig(ADC1,3, (3+1), ADC_SampleTime_15Cycles);
  ADC1->SMPR1=SampleTime_15Cycles&0x00FFFFFF;
  ADC1->SMPR2=SampleTime_15Cycles;

  ADC_Cmd(ADC1, ENABLE);
  ADC_SoftwareStartConv(ADC1);
  ADC_ClearFlag(ADC1,ADC_FLAG_EOC);
}

u16 GetAdcResult(u8 ch)
{
u16 temp;
      //设置转换序列
      //ADC1->SQR3&=0XFFFFFFE0;//规则序列1 通道ch
      //ADC1->SQR3|=ch;
      //设置指定ADC的规则组通道，设置它们的转化顺序和采样时间
      ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_15Cycles);//ADC1,ADC通道3,规则采样顺序值为1,采样时间为239.5周期
      //ADC1->CR2|=1<<22;    //启动规则转换通道
      // Start ADC1 Software Conversion//
      ADC_SoftwareStartConv(ADC1);             //使能指定的ADC1的软件转换启动功能
      //while(!(ADC1->SR&1<<1));//等待转换结束
      while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//等待转换结束
temp = ADC_GetConversionValue(ADC1);       //返回最近一次ADC1规则组的转换结果
ADC_ClearFlag(ADC1,ADC_FLAG_EOC);
return temp;
}