From:	Andrew Cottrell <andnews AT ihug DOT com DOT oz DOT au>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: where i can find the right code examples
Date:	Fri, 19 Jul 2002 20:36:52 +1000
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>Im a new user of djgpp and gcc and im looking for workable code!
>Is there a place where i can find a list of code that i can use.
>I need code that can drive a parallel and  serial port on a dos PC

I have written parallel port driving and checking software with DJGPP.
There are a number of ways to start on the parallel port, they are:-
	1) Download Ralph Brown's interrupt list and check out the I/O
port definitions.
	2) Find a site whoch has programming info on the parallel port
and convert the code from BCC/MS VC to DJGPP. This is is a trivial
task is the code from what I can remember.

The serial port is a bit more complex as you need to figure out what
your requriements are as some of the serial libraries :-
a) only support one com port some support mutliple ports
b) some are interrupt driven and some are polled. I would advise
against usign a polled serial library.
c) some have call back functions on errors. I have not used these.
d) only one supports wakeup mode / 9 bit comms depends on the
background. 
e) the majority of the serial libraries are in C, but soem are in
assembly
f) some are available for DJGPP, BCC and Linux. some are DJGPP/BCC
only and some are DJGPP only
g) some have timing functionality some don't (it's not a big deal as
it is easy to add )

I have a serial data sniffer with full source code available from my
home page http://homepages.ihug.com.au/djgpp~acottrel/

(remove the djgpp from the url)

It supports logging the data to a file and includes timing and replay
facility. May be a place to start. There are bugs in the save/replay
code becuase I have not had time to merge the changes from another
project which uses an updated save/replay core.

Regards,
Andrew

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