In my project I have FreeRTOS enabled, which occupies SysTick and Time increment is handled by TIM1. I also want to use basic timer as TIM6.
However, I don't want them both processed in weak redefined
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
Thus, I enabled register callback for TIM in CubeMX -> advance settings -> register callbacks.
The generated code appears in stm32f4xx_hal_timebase_tim.c and looks as following:
HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
{
RCC_ClkInitTypeDef clkconfig;
uint32_t uwTimclock = 0U;
uint32_t uwPrescalerValue = 0U;
uint32_t pFLatency;
HAL_StatusTypeDef status;
/* Enable TIM1 clock */
__HAL_RCC_TIM1_CLK_ENABLE();
/* Get clock configuration */
HAL_RCC_GetClockConfig(&clkconfig, &pFLatency);
/* Compute TIM1 clock */
uwTimclock = 2*HAL_RCC_GetPCLK2Freq();
/* Compute the prescaler value to have TIM1 counter clock equal to 1MHz */
uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000U) - 1U);
/* Initialize TIM1 */
htim1.Instance = TIM1;
/* Initialize TIMx peripheral as follow:
* Period = [(TIM1CLK/1000) - 1]. to have a (1/1000) s time base.
* Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock.
* ClockDivision = 0
* Counter direction = Up
*/
htim1.Init.Period = (1000000U / 1000U) - 1U;
htim1.Init.Prescaler = uwPrescalerValue;
htim1.Init.ClockDivision = 0;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
status = HAL_TIM_Base_Init(&htim1);
if (status == HAL_OK)
{
/* Start the TIM time Base generation in interrupt mode */
status = HAL_TIM_Base_Start_IT(&htim1);
if (status == HAL_OK)
{
/* Enable the TIM1 global Interrupt */
HAL_NVIC_EnableIRQ(TIM1_UP_TIM10_IRQn);
/* Configure the SysTick IRQ priority */
if (TickPriority < (1UL << __NVIC_PRIO_BITS))
{
/* Configure the TIM IRQ priority */
HAL_NVIC_SetPriority(TIM1_UP_TIM10_IRQn, TickPriority, 0U);
uwTickPrio = TickPriority;
}
else
{
status = HAL_ERROR;
}
}
}
HAL_TIM_RegisterCallback(&htim1, HAL_TIM_PERIOD_ELAPSED_CB_ID, TimeBase_TIM_PeriodElapsedCallback);
/* Return function status */
return status;
}
For some reason HAL_TIM_RegisterCallback() is called after HAL_TIM_Base_Start_IT(), which result's in setting custom callback, because Timer is already running.
Moreover, the weak overwrite callback is still generated in main.c as following:
/**
* @brief Period elapsed callback in non blocking mode
* @note This function is called when TIM1 interrupt took place, inside
* HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
* a global variable "uwTick" used as application time base.
* @PAram htim : TIM handle
* @retval None
*/
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
/* USER CODE BEGIN Callback 0 */
/* USER CODE END Callback 0 */
if (htim->Instance == TIM1)
{
HAL_IncTick();
}
/* USER CODE BEGIN Callback 1 */
/* USER CODE END Callback 1 */
}
So it doesn't look correct, or a am I missing something?
