Instant Interrupts - Revisited

[Demon]

One note of interest, I kept hanging at the end of one of the interrupt modules, like it lost an address on the stack or something. I ran ICD and I saw the execution just hang on the ENDIF at the very bottom.

I have an RX interrupt that would write out to an I2C device 2 bytes received via USART. I removed the I2C command from within the interrupt and instead set a flag. Then I checked the flag from within the main logic and issued the I2C write and everything worked perfectly.

Darrel, here are some screenshots in case you see something obvious. Sorry, I didn't keep a copy of the code.

Robert

[Demon]

2nd pic:

The program USB 18F2550 is for the master processor, that is not the one I am debugging. I am running the next program, MCP23016 16F628A.

Robert

[Darrel Taylor]

Interrupts and the MCSP debugger, don't get along together very well.

You should use DISABLE DEBUG before any interrupt routines, Including the Handlers.

Then ENABLE DEBUG after them.

It is possible to save the debugger variables in the same way as ReEnterPBP, but it's a waste of space when not debugging, so I didn't include them

HTH,
  DT

[Demon]

The weird part is that the interrupts and the debugger worked nicely as long as the I2C command was outside the interrupt routine.

I suppose there are probably exceptions, but disabling/enabling debug in and out of interrupts isn't the end of the world. It's not like we need to debug your work.

Robert

[Darrel Taylor]

It's kind of like standing on the white line in the middle of a highway.

Everythings fine for a while, with cars wizzing past at 90mph.

But take one step to the left or right and, <img src=http://www.darreltaylor.com/files/splash.jpg height=70 width=70 align=top></img>

[Bruce]

Go like splat ehh...;o}

[Darrel Taylor]

Oh yeah, goes like big Splat!
There's a thump thump involved too, but you won't hear that part.

And, much like the highway, everything comes to a halt until the investigation is completed.

I'm just affraid I killed off Spock.
Who else would leave a green Splat?

Well, the moral of the story is two fold.

1. Don't stand in the middle of the Highway.

2. Don't try to Debug your interrupt routines.

LOL,
&nbsp; DT