Date: Wed, 26 Jan 2000 10:41:47 +0800 From: "C.W. Huang" <huangcw@eagle.ee.ntu.edu.tw> To: freebsd-questions@FreeBSD.ORG Subject: Questions about PPSAPI Message-ID: <388E5EEB.3FA63AA3@eagle.ee.ntu.edu.tw>
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Hi,
Recently, I have to fetch PPS from FreeBSD. The OS version
I used is 4.0-20000101 and PPS source is GPS receiver.
Typically, GPS receiver transmits data via RS232 and PPS
is connected to DCD pin. However, I received nothing by the
function code, time_pps_fetch, as I connected GPS receiver to
cuaa0 (com1). (I can read the ascii code from the receiver.)
After reading more from the file LINT, it seems to provide
PPSAPI on parallel port in FreeBSD. I think so because of the
description of /usr/src/sys/i386/conf/LINT as follow:
"device pps0 at ppbus?"
Under such condition, I don't know I should connect my pps
to which pin of parallel port. Am I right? Or it should use
serial port in FreeBSD? If parallel port be used, how do I map
the data transmit, data receive and pps to connector? Please give
me a hand.
Thank you in advance.
Chin-Wei Huang
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
Hi,
<br> Recently, I have to fetch PPS from FreeBSD. The
OS version
<br>I used is <b>4.0-20000101</b> and PPS source is <b>GPS receiver</b>.
<br> Typically, GPS receiver transmits data via <b>RS232</b>
and PPS
<br>is connected to <b>DCD</b> pin. However, I received nothing by the
<br>function code, <b>time_pps_fetch</b>, as I connected GPS receiver to
<br><b>cuaa0</b> (com1). (I can read the ascii code from the receiver.)
<br> After reading more from the file LINT, it seems
to provide
<br>PPSAPI on <b>parallel</b> port in FreeBSD. I think so because of the
<br>description of /usr/src/sys/i386/conf/LINT as follow:
<br>"<b>device pps0 at ppbus?</b>"
<br> Under such condition, I don't know I should connect
my pps
<br>to which pin of parallel port. Am I right? Or it should use
<br>serial port in FreeBSD? If parallel port be used, how do I map
<br>the data transmit, data receive and pps to connector? Please give
<br>me a hand.
<p>Thank you in advance.
<p>Chin-Wei Huang</html>
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