STM32G070CB(定时器TIM级联)

stm32G070不具有32位计时器，自带的TIM均为16位。当需要进行某些同时需要精度与时长的计时内容时，16位计时器并不够用（72M频率不分频直接计数，那么计满16位定时器只需要910us，如果是32位呢，需要59.6s，对于某些毫秒级高精度计时来说，使用32位定时器还是很有必要的。
此例程为两个TIM3和TIM5级联，用2个计时器组成32位计时器。
1、从定时器TIM3初始化

/* TIM3 init function */
void MX_TIM3_Init(void)
{
    /* USER CODE BEGIN TIM3_Init 0 */
    /* USER CODE END TIM3_Init 0 */
    TIM_SlaveConfigTypeDef sSlaveConfig = {0};
    TIM_MasterConfigTypeDef sMasterConfig = {0};

    /* USER CODE BEGIN TIM3_Init 1 */

    /* USER CODE END TIM3_Init 1 */
    htim3.Instance = TIM3;
    htim3.Init.Prescaler = DI_TIM3_PRE-1;
    htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim3.Init.Period = DI_TIM3_PER-1;
    htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
    if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
    {
        Error_Handler();
    }
    sSlaveConfig.SlaveMode = TIM_SLAVEMODE_EXTERNAL1;
    sSlaveConfig.InputTrigger = TIM_TS_ITR2;
    if (HAL_TIM_SlaveConfigSynchro(&htim3, &sSlaveConfig) != HAL_OK)
    {
        Error_Handler();
    }
    sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
    {
        Error_Handler();
    }
//    if (HAL_TIM_Base_Start_IT(&htim3) != HAL_OK)
//    {
//        /* Starting Error */
//        Error_Handler();
//    }
    /* USER CODE BEGIN TIM3_Init 2 */
    HAL_TIM_Base_Start(&htim3); // 打开定时器3
    /* USER CODE END TIM3_Init 2 */
}

2、主定时器TIM15初始化

/* TIM15 init function */
void MX_TIM15_Init(void)
{
    /* USER CODE BEGIN TIM15_Init 0 */

    /* USER CODE END TIM15_Init 0 */
    TIM_ClockConfigTypeDef sClockSourceConfig = {0};
    TIM_MasterConfigTypeDef sMasterConfig = {0};
    /* USER CODE BEGIN TIM15_Init 1 */

    /* USER CODE END TIM15_Init 1 */
    htim15.Instance = TIM15;
    htim15.Init.Prescaler = DI_TIM15_PRE-1;
    htim15.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim15.Init.Period = DI_TIM15_PER-1;
    htim15.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim15.Init.RepetitionCounter = 0;
    htim15.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
    if (HAL_TIM_Base_Init(&htim15) != HAL_OK)
    {
        Error_Handler();
    }
    sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
    if (HAL_TIM_ConfigClockSource(&htim15, &sClockSourceConfig) != HAL_OK)
    {
        Error_Handler();
    }
    sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
    if (HAL_TIMEx_MasterConfigSynchronization(&htim15, &sMasterConfig) != HAL_OK)
    {
        Error_Handler();
    }
    /* USER CODE BEGIN TIM15_Init 2 */
    HAL_TIM_Base_Start(&htim15); // 打开定时器15
    /* USER CODE END TIM15_Init 2 */
}

3、HAL_TIM_Base_Init（）函数中对时钟和中断的使能调用函数。

void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
{
    if(tim_baseHandle->Instance == TIM3)
    {
        /* TIM3 clock enable */
        __HAL_RCC_TIM3_CLK_ENABLE();
        /* TIM3 interrupt Init */
//        HAL_NVIC_SetPriority(TIM3_IRQn, 3, 1);
//        HAL_NVIC_EnableIRQ(TIM3_IRQn);
    }
    if(tim_baseHandle->Instance == TIM15)
    {
        __HAL_RCC_TIM15_CLK_ENABLE();
    }

    if(tim_baseHandle->Instance==TIM6)
    {
        /* USER CODE BEGIN TIM6_MspInit 0 */

        /* USER CODE END TIM6_MspInit 0 */
        /* TIM6 clock enable */
        __HAL_RCC_TIM6_CLK_ENABLE();

        /* TIM6 interrupt Init */
        HAL_NVIC_SetPriority(TIM6_IRQn, 3, 0);
        HAL_NVIC_EnableIRQ(TIM6_IRQn);
        /* USER CODE BEGIN TIM6_MspInit 1 */

        /* USER CODE END TIM6_MspInit 1 */
    }
}

void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* tim_baseHandle)
{
    if(tim_baseHandle->Instance == TIM3)
    {
        /* Peripheral clock disable */
        __HAL_RCC_TIM3_CLK_DISABLE();

        /* TIM3 interrupt Deinit */
        HAL_NVIC_DisableIRQ(TIM3_IRQn);
    }
    if(tim_baseHandle->Instance == TIM15)
    {
        /* Peripheral clock disable */
        __HAL_RCC_TIM15_CLK_DISABLE();

        /* TIM3 interrupt Deinit */
        HAL_NVIC_DisableIRQ(TIM15_IRQn);
    }
    if(tim_baseHandle->Instance==TIM6)
    {
        /* USER CODE BEGIN TIM6_MspDeInit 0 */

        /* USER CODE END TIM6_MspDeInit 0 */
        /* Peripheral clock disable */
        __HAL_RCC_TIM6_CLK_DISABLE();

        /* TIM6 interrupt Deinit */
        HAL_NVIC_DisableIRQ(TIM6_IRQn);
        /* USER CODE BEGIN TIM6_MspDeInit 1 */

        /* USER CODE END TIM6_MspDeInit 1 */
    }
}

4、main()

int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

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

  /* USER CODE BEGIN Init */
  uint32_t eStatus = 0;
  LedStatus_e eLedStatus = LED_OFF;
  /* USER CODE END Init */

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

	MX_TIM3_Init();
	MX_TIM15_Init();
	while(1);
  }

5、现象