Odd behavior if too many instructions

[dksoba]

I'm using a 16f877a on a Lab X-2 board, at 20mhz. I'm using microcode studio plus w/PBP and MicroCode Loader bootloader.

My program has an assembly interrupt routine, which to my knowledge is correct. I have a simple:

main:

LED = 1
pause 50
LED = 0

goto Main

Other_Routines:
...
End

Although right now my program DOES NOT use "Other Routines"... they somehow affect my program. If I move my encoder, which triggers the assembly interrupt, and I have not commented out "Other Routines", there is considerable lag in the time the LED blinks on off. If I delete a large portion of my unused routine (other routine) then the LED blinks on/off normally dispite the huge number of interrupts, which don't take a long time to process.

I am totally lost. Without the "other routines" my code only takes ~800 words. With it, it's over 1100. I'm wondering if I'm going into a different page, but then I"m not sure because my code is still less than 2k words... if I did go into a new page... what are the consequences of that?

Matt

[Acetronics2]

Hi, Matt

Without your "Faulty" code ... no luck to tell you something usable ...

could be as simple as an Interrupt flag you've forgotten to reset ...

COULD be ...

Alain

[dksoba]

Here is my code:

http://pastebin.com/f456e5db

Sorry it's a bit of a mess. If I comment the "IF" on Line 343, with the corresponding ENDIF, the code runs much more consistently. Also, "Encoder_Counting" at 395 disabled interrupts to do some processing, but only for a few lines while it copies a buffer. If I disable interrupts for the entire routine, one of my problems goes away. The problem was that "Current_Position" got changed randomly. I guessed that my interrupt was screwing with it, so I disabled interrupts for that entire routine. Theoretically, my interrupt shouldn't interfere with that at all. None of the variables there are used by the interrupt. When I copy from the variables which are used during the interrupt, I disable global interrupts. ::Confused::

About assembly interrupts, when I use them I only restore the W register. Do I need to do anything with wsave1, wsave2, or wsave3? I know I have to declare them, but I"m not sure where they get used.

Thanks,
MAtt

[Darrel Taylor]

I'm using microcode studio plus w/PBP and MicroCode Loader bootloader.

Try adding ...

DEFINE LOADER_USED 1 ' Bootloader Used

[dksoba]

Try adding ...

DEFINE LOADER_USED 1 ' Bootloader Used

That is defined in generic_include.inc. I moved it to my main pbp file and removed that include, and it still does the same thing.

Does this have something to do with stacksize? If you overflow the stack... what happens?

Matt

[Darrel Taylor]

Does this have something to do with stacksize? If you overflow the stack... what happens?

It has nothing to do with the stack.
It just makes sure nothing is in the first 4 words.
Those locations are needed for the Bootloader.

And when you overflow the stack on 16F's ... Nothing happens.
It's when you return, that you may end up in the wrong place.

What else is in your Includes?
Can you post them too?
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