stm32f103的内部温度测量代码

以下是基于STM32F103芯片的内部温度传感器测量代码示例：

首先，在CubeMX中启用内部温度传感器，并将其分配给一个ADC通道。假设我们将其分配给ADC1通道16：


然后在代码中初始化ADC1并启用DMA传输：

/* ADC1 init function */
void MX_ADC1_Init(void)
{
  ADC_ChannelConfTypeDef sConfig = {0};

  /** Common config 
  */
  hadc1.Instance = ADC1;
  hadc1.Init.ScanConvMode = DISABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Regular Channel 
  */
  sConfig.Channel = ADC_CHANNEL_16;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_13CYCLES_5;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }

  /* Start ADC conversion on regular group with transfer by DMA */
  if (HAL_ADC_Start_DMA(&hadc1, (uint32_t *)&ADC_val, 1) != HAL_OK)
  {
    Error_Handler();
  }
}

在main函数中，我们还需要初始化时钟和DMA，并启用中断：

int main(void)
{
  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_ADC1_Init();

  /* USER CODE BEGIN 2 */
  HAL_ADC_Start_IT(&hadc1); // Enable ADC Interrupt
  printf("Internal Temperature Measurement Example\n");
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */

    HAL_Delay(1000);
  }
  /* USER CODE END 3 */
}

最后，在ADC中断服务程序中读取ADC值并将其转换为温度值：

/**
  * @brief  This function handles ADC1 global interrupt.
  * @param  None
  * @retval None
  */
void ADC1_IRQHandler(void)
{
  /* USER CODE BEGIN ADC1_IRQn 0 */

  /* USER CODE END ADC1_IRQn 0 */
  HAL_ADC_IRQHandler(&hadc1);
  /* USER CODE BEGIN ADC1_IRQn 1 */

  /* USER CODE END ADC1_IRQn 1 */
}

/**
  * @brief  Conversion complete callback in non blocking mode
  * @param  hadc: ADC handle
  * @retval None
  */
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{
  /* Get ADC value */
  uint16_t adc_val = ADC_val;

  /* Convert ADC value to temperature in C */
  float temp_in_c = ((float)adc_val * 3.3 / 4096 - 0.76) / 0.0025 + 25;

  printf("Temperature: %0.2fC\n", temp_in_c);

  /* Start next ADC conversion */
  HAL_ADC_Start_IT(&hadc1);
}

/**
  * @brief  ADC error callback in non blocking mode
  * @param  hadc: ADC handle
  * @retval None
  */
void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)
{
  /* User can add their own implementation to report the ADC error */
  Error_Handler();
}

上述代码将ADC值转换为温度值的公式为：

Temperature (C) = (ADC_value * Vref / 4096 - V25) / Avg_Slope + 25

其中，Vref为ADC参考电压（一般为3.3V），V25是芯片在25℃时的传感器输出电压（一般为0.76V），Avg_Slope是传感器输出电压随温度变化的平均斜率（一般为2.5mV/℃）。具体数值可以参考芯片数据手册。