Arm Development Studio forum Temporarily block SYSTICK interrupt (but not lose it)

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Temporarily block SYSTICK interrupt (but not lose it)

Note: This was originally posted on 18th May 2010 at http://forums.arm.com

CM3 core... I'd like to temporarily block the SYSTICK interrupt (and *only* the SYSTICK interrupt) from firing.

The desired behavior is that if the SYSTICK interrupt would have fired, I'd like it to be "pended", so that as soon as the critical section is over and the interrupt is "re-enabled", it fires.

At first I thought this might be the TICKINT bit in the SYSTICK Control & Status Register (0xE000E010), but from the documentation, it seems that if this bit is clear and the timer reaches 0, the interrupt won't even be pended, i.e., it would be "lost". Am I correct in this?

I know about PRIMASK & BASEPRI, but I don't want to isolate by level and I don't want to disable all interrupts... I simply want to prevent the SYSTICK ISR from running in between "point A" and "point B", but I don't want to "lose" the interrupt, I'd just like to "pend it" if it would occur between "point A" and "point B".

Thanks.