[C.CC USERS] Plumbing serial interface on Arduino Uno

[Steve Pretty]

I have sorted out my problem with serial output from "Plumbing" programs 
running on the Uno.

Matt suggested trying the serial.setup procedure on port 0 at 57600. 
Although output appeared in occplug, it was not the expected character 
stream. I tried a wide range of the normal Baud rates, with similar results.

Some googling revealed that there is an issue with the UNO.  It seems 
there is some bit rate doubler logic in the Atmel chip, which is turned 
on by default in the UNO, but off in previous models (which have 
different I/O hardware).

The trick is to set the arduino to run at half the speed you want it to 
run at.  Half of 57600 is 28800 - and when I tried that, all worked as 
expected.  Here is my test code, which tries all the serial.write PROCs.

#INCLUDE "plumbing.module"

PROC main ()
   SEQ
     serial.setup(TX0, 28800)
     WHILE TRUE
       SEQ
         serial.write.string(TX0, "Hello World!*n")
         serial.write.int32(TX0, #12345678)
         serial.write.newline(TX0)
         serial.write.int(TX0, #137F)
         serial.write.newline(TX0)
         serial.write.byte(TX0, #41)
         serial.write.newline(TX0)

         delay(1000)
:

An observation - the int and int32 PROCs produce output in hexadecimal. 
They use lower case for a to f. occam requires uppercase - something 
that might be worth changing?

Steve