Problem with MSSP module.

[HenrikOlsson]

Forgot to mention: 18F25K20 and PBP 3.0.4.4
Should've editied the post well....you know....

[HenrikOlsson]

Hi,
OK, it LOOKS like a dummy read of SSPBUF before writing the variable to it fixes the problem. The datasheet is fairly clear on this dummyread when expecting valid data - which I don't. And I still don't understand why it makes a difference where the actual value written to SSPBUF is comming from, ie. constant or variable.

/Henrik.

[Demon]

Totally off the top of my head; maybe the dummy read clears a buffer?

And this buffer doesn't handle a constant and variable the same way (allocation of space, bit VS byte, etc).

Robert


EDIT: Looking over your code again and I just thought of something after seeing the PAUSE. Does the time it takes PBP to access the value stored in a variable interfere with the MSSP module?

Bear in mind that I have absolutely no clue what a MSSP module eats in wintertime.


EDIT SOME MORE: Forgot to ask, how are these variables defined?

SST_Status
SSPBUF (looks like a BYTE in MSSP section of 18f25k20 datasheet)