STM32

STM32F407内部温度偏差太大

2019-07-14 16:32发布

站内问答 / STM32/STM8
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求高手指点…


代码如下：

static void        AdcPinComInit(void)
{
        GPIO_InitTypeDef                                GPIO_InitStructure;
        ADC_CommonInitTypeDef                ADC_InitStructure;
        
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2, ENABLE);
        
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
        GPIO_Init(GPIOA, &GPIO_InitStructure);
        
        ADC_InitStructure.ADC_Mode = ADC_DualMode_RegSimult;
        ADC_InitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
        ADC_InitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
        ADC_InitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_10Cycles;
        ADC_CommonInit(&ADC_InitStructure);
}

static void        AdcDmaInit(void)
{
        DMA_InitTypeDef                DMA_InitStructure;
        
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
        
  DMA_InitStructure.DMA_Channel = DMA_Channel_0;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)AdcSampDmaBuf;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_CCR_ADDRESS;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = ADC_DMA_BUF_LEN;
  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_Enable;          ////        
  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);

  DMA_Cmd(DMA2_Stream0, ENABLE);
}

static void Adc1ChxConfig(void)
{
  ADC_InitTypeDef ADC_InitStructure;

  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);

  //// ADC1 regular channels configuration
  ADC_RegularChannelConfig(ADC1, ADC_Channel_TempSensor, 1, ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_15Cycles);
}

static void Adc2ChxConfig(void)
{
  ADC_InitTypeDef ADC_InitStructure;

  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(ADC2, &ADC_InitStructure);

  //// ADC2 regular channels configuration
  ADC_RegularChannelConfig(ADC2, ADC_Channel_2, 1, ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC2, ADC_Channel_4, 2, ADC_SampleTime_15Cycles);
  ADC_RegularChannelConfig(ADC2, ADC_Channel_2, 3, ADC_SampleTime_15Cycles);
}
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15条回答
FAI_weilijuan
2019-07-15 14:39
dull20112011 发表于 2018-10-29 12:37
问题解决了，应该使用Vref = 2.5V，但是抖动幅度还是很大，采集内码值相差100左右，只能滤波了...

内部温度传感器用的人比较少应该，应该会用外部的。

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