Changes between Version 9 and Version 10 of timesync


Ignore:
Timestamp:
07/02/2019 09:24:10 PM (5 months ago)
Author:
Ron Eisworth
Comment:

Added more info on PPS routing

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  • timesync

    v9 v10  
    8181= Time synchronization via PPS (Pulse-Per-Second) (GPS)
    8282
    83 One handy feature of an on-board GPS is that it can deliver Pulse-Per-Second (PPS) signal. This signal can be used to get a high-precision time reference that an application can use to adjust system clock time. Common use is to configure the Network Time Protocol Daemon (NTPD) with a PPS source to obtain a wallclock-time with sub-millisecond synchronization to UTC.
     83One handy feature of an on-board GPS is that it can deliver Pulse-Per-Second (PPS) signal. Most Gateworks SBCs have the option to load an on-board GPS (see individual product pages for specific model numbers and details). The PPS signal can be used to provide a high-precision time reference that an application can use to adjust system clock time or synchronize boards on a network. Common use is to configure the Network Time Protocol Daemon (NTPD) with a PPS source to obtain a wallclock-time with sub-millisecond synchronization to UTC.
     84
     85The PPS signal is routed to a processor GPIO that can be configured to generate an interrupt for use by the user  application. Additionally the PPS signal is optionally routed to one (or several, depending on model) of the Mini-PCIe sites (Pin 49) for use by a radio/peripheral to provide synchronization. Contact support for more information on each board model.
    8486
    8587See [wiki:/gps#pps the GPS page] for more info.