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F030的基准电压读取不对求助

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沙发
发表于 2015-9-18 10:39:27 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
问题描述:简单的通过串口打印verF的数字,发现波动很大。请用过的兄弟帮忙
(怀疑是AD初始化有问题,还发现不同的转换周期对基准的数值影响很大,但PA0正常)
测试实际的输出:
PA1 AD:1984,Vref:0,TempSensor:1440,Vbat:1552
PA1 AD:2045,Vref:0,TempSensor:1429,Vbat:1527
PA1 AD:2008,Vref:86,TempSensor:1416,Vbat:1544
PA1 AD:2027,Vref:0,TempSensor:1387,Vbat:1512
PA1 AD:1994,Vref:55,TempSensor:1440,Vbat:1691
PA1 AD:2007,Vref:75,TempSensor:1375,Vbat:1663
PA1 AD:2047,Vref:0,TempSensor:1367,Vbat:1663
PA1 AD:1999,Vref:0,TempSensor:1359,Vbat:1663
PA1 AD:2015,Vref:0,TempSensor:1343,Vbat:1647
使用的AD初始化源代码:
   uint16_t RegularConvData_Tab[4];


void ADC1_DMA_Init(void)
{
        GPIO_InitTypeDef    GPIO_InitStructure;
        DMA_InitTypeDef     DMA_InitStructure;
        ADC_InitTypeDef     ADC_InitStructure;


        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);   // ????GPIOA ?±??

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);        

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 , ENABLE);               
        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

        ADC_DeInit(ADC1);//ADC1 ??????        

  DMA_DeInit(DMA1_Channel1);        /* DMA1 Channel1 Config */
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;//???è???·
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RegularConvData_Tab;//???????·
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                   //???è×÷????????????
  DMA_InitStructure.DMA_BufferSize = 4;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;     //???è???·??±?
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;               //???????·????
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;  //???????í????16??
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;          //???????í????16??
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);



        DMA_Cmd(DMA1_Channel1, ENABLE);/* DMA1 Channel1 enable */                        
        ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular); /* Enable ADC_DMA */        
  ADC_DMACmd(ADC1, ENABLE);  



        ADC_StructInit(&ADC_InitStructure);//??????ADC?á??

        ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //?????è??
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward; //ADC???¨?è·??ò
  ADC_Init(ADC1, &ADC_InitStructure);

  ADC_ChannelConfig(ADC1, ADC_Channel_0 , ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 11 with 239.5 Cycles as sampling time */  
   ADC_VrefintCmd(ENABLE);
  ADC_ChannelConfig(ADC1, ADC_Channel_Vrefint ,ADC_SampleTime_239_5Cycles);

        ADC_TempSensorCmd(ENABLE);
        ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor ,ADC_SampleTime_239_5Cycles);

        ADC_VbatCmd(ENABLE);
        ADC_ChannelConfig(ADC1, ADC_Channel_Vbat ,ADC_SampleTime_239_5Cycles);


        ADC_GetCalibrationFactor(ADC1); /* ADC Calibration */  
  ADC_Cmd(ADC1, ENABLE);  /* Enable ADCperipheral[PerIdx] */
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN)); /* Wait the ADCEN falg */
  ADC_StartOfConversion(ADC1); /* ADC1 regular Software Start Conv */                 
}     转载

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