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標(biāo)題: STM32F030c8t6單片機讀取內(nèi)部溫度傳感器值不正確？ [打印本頁]

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作者: killalljp    時間: 2019-3-11 13:32
標(biāo)題: STM32F030c8t6單片機讀取內(nèi)部溫度傳感器值不正確？
這個是初始化代碼

得到的溫度值都是偏大 譬如室溫是25攝氏度得到的值是65？

哪位大神有成功代碼參考參考？

1. /* Temperature sensor calibration value address */
   
2. #define TEMP30_CAL_ADDR ((uint16_t*) ((uint32_t) 0x1FFFF7B8))
   
3. #define VDD_CALIB ((uint32_t) (3300))
   
4. #define VDD_APPLI ((uint32_t) (3000))
   
5. #define AVG_SLOPE ((uint32_t) (5336)) //AVG_SLOPE in ADC conversion step (@3.3V)/°C multiplied by 1000 for precision on the division
   
6. int32_t temperature; /* will contain the temperature in degrees Celsius */
   
7. temperature = ((uint32_t) *TEMP30_CAL_ADDR - ((uint32_t) ADC1->DR * VDD_APPLI / VDD_CALIB)) * 1000;
   
8. temperature = (temperature / AVG_SLOPE) + 30;

復(fù)制代碼

這個是參考手冊里的源碼

1. static void MX_ADC_Init(void)
   
2. {
   
3. 
   
4.   ADC_ChannelConfTypeDef sConfig;
   
5. 
   
6.   /**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) */
   
7.   hadc.Instance = ADC1;
   
8.   hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
   
9.   hadc.Init.Resolution = ADC_RESOLUTION_12B;
   
10.   
    
11.   hadc.Init.SamplingTimeCommon = ADC_SAMPLETIME_239CYCLES_5;
    
12.   
    
13.   hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    
14.   hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
    
15.   hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
    
16.   hadc.Init.LowPowerAutoWait = DISABLE;
    
17.   hadc.Init.LowPowerAutoPowerOff = DISABLE;
    
18.   hadc.Init.ContinuousConvMode = DISABLE;
    
19.   hadc.Init.DiscontinuousConvMode = ENABLE;
    
20.   hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
    
21.   hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
    
22.   hadc.Init.DMAContinuousRequests = DISABLE;
    
23.   hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
    
24.   /* Initialize ADC peripheral according to the passed parameters */
    
25.   if (HAL_ADC_Init(&hadc) != HAL_OK)
    
26.   {
    
27.     _Error_Handler(__FILE__, __LINE__);
    
28.   }
    
29. 
    
30.   /* 校正ADC */
    
31.   if(HAL_ADCEx_Calibration_Start(&hadc) != HAL_OK)
    
32.   {
    
33.     _Error_Handler(__FILE__, __LINE__);
    
34.   }
    
35.   
    
36.   /**Configure for the selected ADC regular channel 16 to be converted.*/
    
37.   sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
    
38.   if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
    
39.   {
    
40.     _Error_Handler(__FILE__, __LINE__);
    
41.   }
    
42. }

復(fù)制代碼

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作者: Angle145    時間: 2019-3-11 20:44
1.芯片內(nèi)部溫度本來就比室溫高，2.內(nèi)部溫度傳感器是低精度的，一般此溫度是用來監(jiān)測芯片內(nèi)部溫度變化(做參考)而不是它精確的溫度

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