From: Tom Moran <tmoran@bix.com>
Subject: Re: High Precision timing
Date: 1997/04/08
Date: 1997-04-08T00:00:00+00:00 [thread overview]
Message-ID: <334AAD2E.3641@bix.com> (raw)
In-Reply-To: 5iddnc$57u@news.mel.aone.net.au
It's been a while, but doesn't counter 2 of the PC's 8253 control
dynamic RAM refresh? If so, I'd suggest you not fiddle with it.
If you need high resolution timing, but not frequent, time consuming
interrupts, how about just reading, but not resetting, channel 1?
That's what I did in my replacement Calendar body for RR's Ada 83
(available on their BBS).
If you need frequent interrupts with pretty good timing properties,
output (junk) characters on a serial port at 115 Kbaud, with the
Transmit interrupt ISR merely stuffing another character out the port.
That will give interrupts at just under 100 microseconds. I've posted
code for a background speaker driver using this technique on Compuserve.
next prev parent reply other threads:[~1997-04-08 0:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-04-09 0:00 High Precision timing Ian Swinkels
1997-04-08 0:00 ` Tom Moran [this message]
1997-04-09 0:00 ` Jerry van Dijk
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