From:	Adam Young <ayoung AT ksu DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Comparison: Serial Port Routines
Date:	Thu, 8 Jan 1998 18:19:28 -0600
Organization:	Kansas State University
Lines:	26
Message-ID:	<Pine.SOL.3.96L.980108180450.18398A-100000@abc.ksu.ksu.edu>
NNTP-Posting-Host:	abc.ksu.ksu.edu
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hello All,

I have a question about the two serial routines written for DJGPP: BCSERIO
and SVAsync.

BCSERIO uses assembly to do all of its handling of the FIFO and such,
while SVASync uses mainly C to handle the serial port. What I am wanting
to know is what is the difference between the two methods (ie advantages
and disadvantages). I have always heard that assembly language is faster
than C. Here is what confuses me: Isn't the C code converted to assembly
language, therefore being just as fast as straight assembly?

This question came about from me trying to learn how interrupts are
handled by C and assembly when dealing with the serial port. I do not know
much about assembly language, but I do know alot more than I did a few
days ago. I have checked out "djgppasm.doc" and Ralf Brown's interrupt
list and other assembly sites the last few days. Which I guess leads me to
one more (kind of related) question: Can DJGPP handle interrupts on a
basic level like assembly can? 

Hopefully, someone can see where I am coming from. I am really not sure
WHERE I am going with this, but it has me intrigued. Thanks in advance!

Adam
ayoung AT ksu DOT edu

- Raw text -