Xref: news2.mv.net comp.os.msdos.djgpp:2379
From: vicari AT mercurio (Paolo Vicari)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Help: My timer interrupt isn't keeping up.
Date: 2 Apr 1996 08:22:26 GMT
Organization: Computer Science Dep. - Milan University
Lines: 26
Message-ID: <4jqo42$gir@tic.sm.dsi.unimi.it>
References: <4jp9ro$e1q AT sulawesi DOT lerc DOT nasa DOT gov>
NNTP-Posting-Host: 131.175.5.41
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

Gregory Fedor (gfedor AT lerc DOT nasa DOT gov) wrote:
: Included below is the code I've been working on.  I want to establish 
: a 1 millisecond interrupt that simply increments a counter.  Then, the 
: main program, based on that counter will collect data at various rates 
: (ie. one timer, multiple rates).

[snip]

:   2ms             500.00        491
:   1ms             1000.00       981

: As you can see I loose something at the end.

: #define lOSC_FREQ 1193

--

AFAIK, the actual timer frequency is (very) slightly different from 1193.0000
KHz. Maybe you could obtain more precise timings with a better
#define. If you do need the precise value, mail me and I'll look in my books.

Hope this helps somehow!					Good luck!

		-----------------------------------------
		 Paolo Vicari - vicari AT mailer DOT cefriel DOT it
		-----------------------------------------