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I wrote a small program to transmit characters from my new PIC PCB to the
workstation.  I then thought I would use some subroutines and send
meaningful messages.

I don't have the values I expect in the W register after a subroutine
call.  The code is on the web, and a good assemble and a few bad assembles
can be made by changing the command line switches.

The simple "send 1 character" at high speeds part does work, at least to
38,400.  LEDs off of port D are used for diagnostic purposes.  No input is
supported: this is transmit only.


http://www.jump.net/~vima/PIC/f874_txb.asm

Should the contents of W survive a subroutine return?
Should they survive a call to a subroutine that only executes "return"


--
Aubrey McIntosh, Ph.D.


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