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Problem: Big Delay of an Interruption

Santi Amo over 18 years ago

Hi,

I'm using an AT91M55800 with an external clock of 3'57MHz, and all is working perfect.

At this moment, I only use 2 interruptions:

- Timer 0 interruption, to gererate a 5ms time base.
- PORTB interruption.

All peripherals work properly (display, keyboard, etc)

I only configure one PIN to use the PORTB interrupcion.

When happend a level change on that pin the PORTB interruption start, BUT with 100ms-150ms DELAY!

Is tooo big delay, If I listen the signal by pin status pooling, I don't have delay, only if I use the interruption. (The priority is 7)

What can be the problem???

Thanks!