STM32L0系列之【TIM通用定时器】

上一章：STM32L0系列之【EEPROM读写】

频率2.097Mhz , TIM2定时1s触发一次中断

1.TIM2初始化

HAL_TIM_Base_Init>HAL_TIM_ConfigClockSource>HAL_TIMEx_MasterConfigSynchronization

/**
  * @brief TIM2 Initialization Function
  * @param None
  * @retval None
  */
TIM_HandleTypeDef htim2;
void MX_TIM2_Init(uint16_t time)
{
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 2000;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = time - 1;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
}

2.TIM2 中断处理函数

/**
  * @brief This function handles TIM2 global interrupt.
  */
void TIM2_IRQHandler(void)
{
  HAL_TIM_IRQHandler(&htim2);
}

3.主函数main

int main(void)
{
	 HAL_Init();
    /* Configure the system clock */
    SystemClock_Config();
    LED_Init();//LED初始化
	MX_TIM2_Init(1001); //1s一次
	HAL_TIM_Base_Stop_IT(&htim2);
	HAL_TIM_Base_Start_IT(&htim2);

	while(1)
	{}
}

4.TIM中断回调处理函数

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    if(htim == &htim2)
    {
    	HAL_GPIO_TogglePin(GPIOB,GPIO_PIN8);
    }
}

下一章：STM32L0系列之【串口收发】