STM32F051R8 TIM14 does not work

Hi,

I'm practicing with the timers of my STM32F0-Disco.

Quite simply, I'm trying to use TIM6 or TIM14 as a simple time base. In order to verify its correct functioning I have put a GPIO call to toggle a LED whenever the interrupt handling function is called.

I used STMCubeMX to generate the code (very simple, since it uses only TIM14 plus two GPIOs, the on-board green and blue LEDs).

The thing that has been driving me crazy for two days is that the TIM14_IRQHandler () interrupt handling function is never called and consequently the LED does not flash.

I have checked and re-checked the generated code several times, also adding the timer activation call, LL_TIM_EnableCounter (TIM14).

The code follows:

static void MX_TIM14_Init(void)
{
 
	/* USER CODE BEGIN TIM14_Init 0 */
 
	/* USER CODE END TIM14_Init 0 */
 
	LL_TIM_InitTypeDef TIM_InitStruct = {0};
 
	/* Peripheral clock enable */
	LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM14);
 
	/* TIM14 interrupt Init */
	NVIC_SetPriority(TIM14_IRQn, 0);
	NVIC_EnableIRQ(TIM14_IRQn);
 
	/* USER CODE BEGIN TIM14_Init 1 */
 
	/* USER CODE END TIM14_Init 1 */
	TIM_InitStruct.Prescaler = 47999;
	TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
	TIM_InitStruct.Autoreload = 499;
	TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
	LL_TIM_Init(TIM14, &TIM_InitStruct);
	LL_TIM_EnableARRPreload(TIM14);
	/* USER CODE BEGIN TIM14_Init 2 */
 
	/* USER CODE END TIM14_Init 2 */
 
 
	/* Enable counter */
	LL_TIM_EnableCounter(TIM14);
 
}

The previous function is called in my main() bode, before the usual while(1) loop.

In my stm32f0xx_it.c I've written the interrupt handler as follows:

void TIM14_IRQHandler(void)
{
	LL_TIM_ClearFlag_UPDATE(TIM14);
 
	LL_GPIO_TogglePin(LD4_GPIO_Port,LD4_Pin);
}

With the programmed values for prescaler and autoreload register I would expect an update event every 0.5 seconds, having a system core clock of 48 MHz.

Bute the IRQ handler never gets called (the LED don't flash).

Did I forget something trivial?

Max