1、初始化TIM基本计数器参数
void MX_TIM2_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {};
TIM_MasterConfigTypeDef sMasterConfig = {}; htim2.Instance = TIM2;
htim2.Init.Prescaler = -;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = -;
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、HAL_TIM_Base_Init(&htim2)应用参数基本参数配置
HAL_StatusTypeDef HAL_TIM_Base_Init(TIM_HandleTypeDef *htim)
{
/* Check the TIM handle allocation */
if (htim == NULL)
{
return HAL_ERROR;
} /* Check the parameters */
assert_param(IS_TIM_INSTANCE(htim->Instance));
assert_param(IS_TIM_COUNTER_MODE(htim->Init.CounterMode));
assert_param(IS_TIM_CLOCKDIVISION_DIV(htim->Init.ClockDivision));
assert_param(IS_TIM_AUTORELOAD_PRELOAD(htim->Init.AutoReloadPreload)); if (htim->State == HAL_TIM_STATE_RESET)
{
/* Allocate lock resource and initialize it */
htim->Lock = HAL_UNLOCKED; #if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
/* Reset interrupt callbacks to legacy weak callbacks */
TIM_ResetCallback(htim); if (htim->Base_MspInitCallback == NULL)
{
htim->Base_MspInitCallback = HAL_TIM_Base_MspInit;
}
/* Init the low level hardware : GPIO, CLOCK, NVIC */
htim->Base_MspInitCallback(htim);
#else
/* Init the low level hardware : GPIO, CLOCK, NVIC */
HAL_TIM_Base_MspInit(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
} /* Set the TIM state */
htim->State = HAL_TIM_STATE_BUSY; /* Set the Time Base configuration */
TIM_Base_SetConfig(htim->Instance, &htim->Init); /* Initialize the TIM state*/
htim->State = HAL_TIM_STATE_READY; return HAL_OK;
}
3、HAL_TIM_Base_MspInit(htim) 初始化中断信息(该函数需要重写,CubeMX在配置生成代码时会自动重写该函数)
/**
* @brief Initializes the TIM Base MSP.
* @param htim TIM Base handle
* @retval None
*/
__weak void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
/* Prevent unused argument(s) compilation warning */
UNUSED(htim); /* NOTE : This function should not be modified, when the callback is needed,
the HAL_TIM_Base_MspInit could be implemented in the user file
*/
}
重写实现
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
{ if(tim_baseHandle->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspInit 0 */ /* USER CODE END TIM2_MspInit 0 */
/* TIM2 clock enable */
__HAL_RCC_TIM2_CLK_ENABLE(); /* TIM2 interrupt Init */
HAL_NVIC_SetPriority(TIM2_IRQn, , );
HAL_NVIC_EnableIRQ(TIM2_IRQn);
/* USER CODE BEGIN TIM2_MspInit 1 */ /* USER CODE END TIM2_MspInit 1 */
}
}
4、使能TIM中断
虽然经过以上配置,TIM的参数信息都已完整应用,但是TIM的中断并没用真正使能.这个地方困扰了我好久(运行没错误,但是计数中断就不触发, 不计数),必需调用以下函数使能中断,串口中断使能也是类似的.
HAL_TIM_Base_Start_IT(TIM_HandleTypeDef *TIM);//开启定时器中断
该函数的调用地点只要是在 HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle) 函数之后就行,可以在main.c中也可以在上面的代码之后.
下面的代码存在一个BUG,如果 HAL_TIM_Base_Start_IT 函数调用写在下面的位置,虽然可以使能中断,但会造成MCU上电即触发中断的情况.
HAL_TIM_Base_MspInit调用之后会重新设置寄存器的值,__HAL_TIM_CLEAR_FLAG(tim_baseHandle, TIM_SR_UIF)清理的寄存器被改写.
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
{ if(tim_baseHandle->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspInit 0 */ /* USER CODE END TIM2_MspInit 0 */
/* TIM2 clock enable */
__HAL_RCC_TIM2_CLK_ENABLE(); /* TIM2 interrupt Init */
HAL_NVIC_SetPriority(TIM2_IRQn, , );
HAL_NVIC_EnableIRQ(TIM2_IRQn);
/* USER CODE BEGIN TIM2_MspInit 1 */
//清理TIM开启时的中断标识
__HAL_TIM_CLEAR_FLAG(tim_baseHandle, TIM_SR_UIF);//添加这条语句解决问题
//htim2.Instance->SR = 0; //这是另一种解决办法
//使能TIM中断
HAL_TIM_Base_Start_IT(tim_baseHandle);
/* USER CODE END TIM2_MspInit 1 */
}
}
正确的做法是在 HAL_TIM_Base_Init(&htim2) 之后使能TIM中断,并清理TIM的更新中断寄存器
void MX_TIM2_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {};
TIM_MasterConfigTypeDef sMasterConfig = {}; htim2.Instance = TIM2;
htim2.Init.Prescaler = -;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = -;
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();
} //清理TIM开启时的中断标识
__HAL_TIM_CLEAR_IT(&htim2, TIM_IT_UPDATE);
//使能TIM中断
HAL_TIM_Base_Start_IT(&htim2);
}
5、计数中断处理
/**
* @brief This function handles TIM2 global interrupt.
*/
void TIM2_IRQHandler(void)
{
/* USER CODE BEGIN TIM2_IRQn 0 */ /* USER CODE END TIM2_IRQn 0 */
HAL_TIM_IRQHandler(&htim2);
/* USER CODE BEGIN TIM2_IRQn 1 */ /* USER CODE END TIM2_IRQn 1 */
}
HAL_TIM_IRQHandler(&htim2)中断函数处理
/**
* @brief This function handles TIM interrupts requests.
* @param htim TIM handle
* @retval None
*/
void HAL_TIM_IRQHandler(TIM_HandleTypeDef *htim)
{
/* Capture compare 1 event */
if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC1) != RESET)
{
if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC1) != RESET)
{
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_CC1);
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_1; /* Input capture event */
if ((htim->Instance->CCMR1 & TIM_CCMR1_CC1S) != 0x00U)
{
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
htim->IC_CaptureCallback(htim);
#else
HAL_TIM_IC_CaptureCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
}
/* Output compare event */
else
{
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
htim->OC_DelayElapsedCallback(htim);
htim->PWM_PulseFinishedCallback(htim);
#else
HAL_TIM_OC_DelayElapsedCallback(htim);
HAL_TIM_PWM_PulseFinishedCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
}
htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
}
}
}
........................
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/* TIM Update event */
if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_UPDATE) != RESET)
{
if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_UPDATE) != RESET)
{
__HAL_TIM_CLEAR_IT(htim, TIM_IT_UPDATE);
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
htim->PeriodElapsedCallback(htim);
#else
HAL_TIM_PeriodElapsedCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
}
}
........................
........................ }
HAL_TIM_PeriodElapsedCallback(htim);当计数溢出时调用的回调函数,需要用户根据实际需求具体实现
/**
* @brief Period elapsed callback in non-blocking mode
* @param htim TIM handle
* @retval None
*/
__weak void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
/* Prevent unused argument(s) compilation warning */
UNUSED(htim); /* NOTE : This function should not be modified, when the callback is needed,
the HAL_TIM_PeriodElapsedCallback could be implemented in the user file
*/
}
6、实现计数完成回调函数,调试代码,查看计数器中断效果.