> > >> Are both drivers using the same PPS signal? > > > > > > Yes, it is so. > > > > > >> If so, what do you hope to gain? > > > > > > Why the same source (PPS) may not be shared? > > You show it does. But why? It is the same source. > Note that if this is not the same source-- ie is attached to different > interrupts ( parallel and serial ports for example) you will have > interrupt contention. One of the interrupts will be seen by the computer > as occuring first, and will be serviced first. Interrupts are turned off > while the interrupt is serviced. Thus there is a 10-20us delay before > the other interrupt is serviced. Ie, the two interrupts will not be timed > to occur at > the same time. They will have timestamps that differ by 10s of us. > Now if it is the same interrupt that you are sending to two separate > handlers, the question really is "why". There is no extra information > that the two can give you. > > As I understand ntp uses /dev/gpspps0 as pps source so all interrupts things are placed into lower levels. For example I can run ppstest /dev/pps0 at the same time with ntp and it works fine.
Thanks, Alex. _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
