[Flashforth-devel] Trouble getting serial comms to work

[Richard B. <ric...@gm...>]

Hi all,

I was given a board with a pic on it, the 18f45k20. It uses a 12288kHz
crystal. While I have used several forths on micro's I'm not claiming
any expertise.

So I compile an image, using
  constant clock=d'12288000'  ; Hz
in p18f-main.cfg.

And in p18f2x4xk20.cfg
#define PLL DISABLE	         ; ENABLE or DISABLE

And somewhere I remember a setting to use the external crystal.

So I flash the pic and hook up a serial port at 38400, 8N1. And on
power all I get is garbage. I used Pulseview to see what is coming out
of the serial port. The minimum pulse in the data stream at power up
is consistent with 38400 baud. But instead of any kind of ascii being
decoded I get frame errors on each byte and nothing like ascii.

In ff-pic18.lst I can see that  at line 481
00481             #include p18f45k20.inc
the right processor is being included so I assume I have everything
set up correctly.

But clearly I am making a silly error somewhere. Does anyone have
advice on what I should check please? Or what further information
should I supply to shed light on this please?

Many thanks
Richard