Help Needed with Darrel's Interrupt on Change Routine

[Aussie Barry]

So close and yet so far....

Thanks for the input guys. I added the IOCBF=0 line to the ISR and, after adding a slight pause to debounce the switch, all is now working properly.

Two things confuse me though:

1/. Without the IOCBF=0 statement, why didn't my initial code get to the ISR the first time a switch was pressed? I would have expected the ISR to be called once (changing Level from 3 to 4 or 3 to 2 depending which switch was pushed) but then halting due to the IOCBF not being reset.

2/. What should I expect regarding the commenting-out of the variables (wsave etc) when first compiling the Instant Interrupt routine? It compiles with all lines commented out. Is this right and if so, why?

Cheers
Barry
VK2XBP

[Darrel Taylor]

1. It would have called the ISR the first time.
   But it would have never made it back to the main program to display the change.
   As soon as it exits the ISR, it immediately triggers an interrupt again because the flag wasn't cleared.
   .
2. The 16F1's do automatic context saving.
   You do not need any wsave variables.
   
   Which is why it didn't tell you to uncomment any of them.

[Aussie Barry]

Thanks Darrel.

I understand now.

Onwards and upwards! Time to add your Elapsed Timer routine to this project

Cheers
Barry
VK2XBP