Dave wrote:
Basically what I want to do is take a signal from a GPS receiver and discipline the system time on a Solaris machine. However, the GPS receiver I need this to interface with is not listed under the supported drivers page. The receiver I need to use has a RS232 serial port (which I have the complete specs on). Is it possible to write an external reference clock driver that I will be able to use to complete this project?The receiver outputs a 1PPS-UTC signal, so would I somehow use the NTP PPS Clock Discipline (Driver 22) to receive that 1PPS signal? Or am I way off?
If your GPS receiver outputs data in NMEA format, you should be able to use the NMEA driver. See the comments in refclock_nmea.c in the ntp distribution you are using. There may be additional documentation elsewhere but I don't know where it is. The NMEA drivers supports the PPS signal. I believe that the convention is that you connect it to the DCD pin on the serial port.
If you can't find good documentation, keep careful notes and then write some. There's a home for such at http://ntp.isc.org/bin/view/Support/RefclockUsers
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