Timer Interrupt Code Doubt

[Killstreet30]

Hello. I used to use the following code for starting a timer interrupt and used to set up the pre scalar and counter such a way I get the desired frequency but now this code is not working. My LED doesn't blink at all. I just wanted to check if the code is wrong or iff my hardware has some problem.

  HAL_TIM_Base_Start_IT(&htim2);

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){

if(htim->Instance == TIM2){

HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);

}

}

[KnarfB]

Have you enabled that timer interrupt in the chip configuration tool?

hth

KnarfB

[Killstreet30]

yes it's enabled.

[KnarfB]

What chip?

Two ways:

• check/dump/post the relevant timer registers
• place a breakpoint in the native TIM2 IRQ handler in the _it.c source file and step into the HAL code

hth

KnarfB

[Killstreet30]

NUCLEO - L476RG

the code was working perfectly a week back today it just doesn't seem to work so I'm not able to understand what went wrong cause there has been no change.

[KnarfB]

Other interupts, eating up the CPU? Somehow disabled interrupts? Look at the registers, they do not lie.

or: roll-back your code, use git early and often https://youtu.be/hwP7WQkmECE

hth

KnarfB

[Killstreet30]

no other interrupts are enabled and I restored the version yet I don't know it just doesn't work. I updated my STM IDE version. does that make a difference?

[waclawek.jan]

Check whether the real ISR is called, not the callback, to exclude Cube/HAL issues.

Read out and check/post content of TIM and NVIC registers.

Generic guideline for "interrupt does not fire" here.

JW