STM32L476 Timer: on button push, load Compare Register with debounce value, then generate IRQ?

[SWenn.1]

Hello....

I have TIM1 clocking at 1ms. It rolls over at 1000 counts (ie 1 second). Within the pushbutton IRQ I add 50 to the timer register and disable the GPIO IRQ. I would also like to enable a compare IRQ here as well, such that after the counter counts 50ms it generates a compare IRQ at which point I will re-enable the GPIO IRQ and set a flag for main.

 

I used LL code to set the timer and disable the GPIO IRQ but don't know exactly what registers to touch to enable the compare IRQ....can someone please tell me how to do this?

 

I do not want to have a timer that gets enabled in the GPIO IRQ and counts for 50 then generates an interrupt as I want to make use of a continuous timer that is running at 1ms and rolls every second as this is available for other purposes.

 

Thanks

 

[gbm]

Oh, of course you may and can use as many different interrupts for the simple task of checking the button state as you want. There are some other candidates besides EXTI: USB and ADC being the most obvious ones. I just said there is no point in using EXTI because in any case you MUST also use timer interrupt, and you can achieve the same effect with significantly reduced source code size and complexity by using ONLY the timer interrupt, without engaging EXTI at all.