[sdiy] DSPIC computed branch and include help

[Richie Burnett]

Has anyone else here using Microchips DSPIC tried to implement a computed 
branch using the "BRA w0" instruction ?

No matter what I do, I can't get it to work as explained in the programmers 
reference guide description of the BRA instruction.  It says that it should 
jump to the address (PC+2) + (2*w0)  (which makes sense because the program 
counter would already be ready to pre-fetch the next instruction, and 
instructions are aligned on 2-word boundaries,)  but instead it seems to 
jump to (PC+2) + w0  but ignores the LSB of w0, (otherwise it would produce 
a misaligned odd program counter address!)  I've checked and checked this 
and I don't see what I'm doing wrong, and can't find an errata sheet that 
mentions this problem.  Chip being used is dsPIC33FJ128GP804.

Also can someone tell me the correct way to include additional assembly 
source files *.s in MPLAB.  I just put

.include "filters.s"
.include "maths.s"
.include "comms.s"

etc... at the end of main.s but this seems to have completely broken MPLAB 
8.92.  It assembles fine, programs fine and runs fine, but goes crazy when 
hitting a breakpoint or single-stepping inside any of the included source 
files.  I'm used to the included file just popping open and the program 
counter arrow switching between whichever source window it needs to be in as 
different routines are called.  I'm actually getting the program counter 
arrow moving to lines in the source file that just have comments on them 
before the actual code starts when it should switch to one of the included 
source contents.  Also FWIW the addresses in the "Disassembly Listing" 
window are all garbled too!  It only does this when I include additional 
source files, so I must be doing something wrong!?!?

I'd like to divide the source code up into relevant sections in separate 
files to make a big project easier to follow, so really want to get this 
done right.

Thanks in advance for any suggestions !

-Richie,