Teensy 4 PIT timers and interrupt requests

[xenington]

Hi

I was thinking about PIT timers and attaching and prioritising IRQ's (as you do).

For example:

attachInterruptVector(IRQ_PIT, example_ISR); 
NVIC_ENABLE_IRQ(IRQ_PIT);               
NVIC_SET_PRIORITY(IRQ_PIT, 0);

I would like to use the PIT timers to trigger several interrupts, but IRQ_PIT has only 1 entry in IMXRT.h.

Does that mean only 1 interrupt can be requested? Is it possible to make several, different interrupt requests? And then set different priorities and time intervals for each one?

Thanks

 

[manitou]

you'll need to check some status flags in the ISR to see which PIT timer fired, see
https://forum.pjrc.com/threads/54711-Teensy-4-0-First-Beta-Test?p=195605&viewfull=1#post195605

 

[xenington]

Thank you for the reply and link.

Is it possible to have multiple interrupt requests, e.g. IRQ_PIT[1], IRQ_PIT[2], etc, which can have different priorities?

 

[HallMark]

Thank you for the reply and link.

Is it possible to have multiple interrupt requests, e.g. IRQ_PIT[1], IRQ_PIT[2], etc, which can have different priorities?

Have you tried TeensyTimerTool Library:- https://github.com/luni64/TeensyTimerTool ?
Here is Thread on this forum:- https://forum.pjrc.com/threads/59112-TeensyTimerTool

 

[xenington]

Problem solved

@HallMark

Yes, I have thanks. the TeensyTimerTools clashed with the flexPWM timer I was using to measure input frequencies. I found a way round it though with FreqMeasureMulti_X:

https://forum.pjrc.com/threads/59844-FreqMeasureMulti-on-the-T4?p=235397&viewfull=1#post235397