DT-Interrupts - Is there a clash between ExtInt and IntOnChange?

[Balachandar]

interrupts on a pic16 cannot be interrupted therefore for the entire duration of
RunTheFanAtCurrentSpeed: and the GetTheIRCommand: routines the timer is effectively stalled
it simply cannot keep time.

Thanks Richard, for clearly stating where the problem is.

When one interrupt is being serviced, if another interrupt occurs, the second one either gets ignored (in PIC16 and lower) or is acted upon after a delay (in PIC18). That's what I understand from your post.

When I use my IR remote, if I have to press the button 2 or 3 times or there is a delay of a few milliseconds in executing that command, it is not an issue. But when the error margin is around 80% or higher in the operation of the Elapsed Timer, that is definitely a big problem.

I feel, using another PIC like 12F683 for the Elapsed Timer is one solution. If I use an 18F device, I will have the option to assign priority to interrupts but the Timer accuracy will still be an issue.

Are there other ways of solving the problem?

- Bala