Interrupts Revisited

[crematory]

Hello

Good answer bruce, really good one

Any way, to solve your problem, here is what you have to do, as it worked for me:

1. Read portb.
2. Clear the GIE and portb on change IE bit.
3. Pause for, say 100 to 150 ms, to ensure that the user has releasd the button.
4. Do what you want to do. Use the first value you read for portb.
5. Now set RB on change IE bit.
6. Then read portb again, to clear any "may be" pending interrupts, don't try to read portb before enabling RB IE bit, as this is certainly will not be sufficent.
7. Resume will enable GIE bit.

I wish I had that code, I formatted the C partition, and forgot to move some files, that was one of them

[Bruce]

Download AN552 (Implementing Wake-up on Key Stroke) from Microchip, and ye will see the light....;o}

[Rob Martin]

The inputs are from brake, left and right indicators etc. so the inputs can be very short pulses if someone touches the brake for a fraction of a second hence why I was using the on change interrupts to catch all the inputs.
The inputs are all held low by resistors (not high as i put before).

I'll try the answer that bruce & Co have offered and see if i can find the answer to my problems.

Thanks for the support guys it's kept me sane


Rob

[crematory]

Hello Rob

Its recommended to have the port pins pulled up, as this will save you long hours of code debuging to find out why your PIC is seeing a brake pushed, while its not indeed.


Regards