Hi Marcus, My goal is to get NTP daemon running on N300 synced with GPSDO and PPS. Could it be that the GPSDO time is internally latched with the PPS line? If this is the case then I guess that it would not be necessary to read the PPS. I have seen the "Device Synchronization" section and "sync_to_gps" example in the USRP HW Driver and USRP Manual but I am not sure if I have to do this if I just want to synchronize the NTP and system time on just one USRP N300. Thanks, Roberto De: USRP-users <usrp-users-bounces@lists.ettus.com<mailto:usrp-users-bounces@lists.ettus.com>> En nombre de Marcus D. Leech via USRP-users Enviado el: miércoles, 3 de febrero de 2021 17:10 Para: usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> Asunto: Re: [USRP-users] GPSDO and PPS on USRP N300 On 02/03/2021 02:31 AM, Puertas Blanco, Roberto via USRP-users wrote: Hello, Is there any way to get the PPS pulse from PS side (ARM) in the USRP N300? I would like to know if the PPS is mapped through the /dev/pps or if it is embedded into GPSDO module. Thanks, Roberto The answer (based on the version of the system image that I have) is no. The PPS line does not "manifest" as /dev/pps on the ARM CPU. ________________________________ Este correo electrónico y, en su caso, cualquier fichero anexo al mismo, contiene información de carácter confidencial exclusivamente dirigida a su destinatario o destinatarios. Si no es vd. el destinatario indicado, queda notificado que la lectura, utilización, divulgación y/o copia sin autorización está prohibida en virtud de la legislación vigente. En el caso de haber recibido este correo electrónico por error, se ruega notificar inmediatamente esta circunstancia mediante reenvío a la dirección electrónica del remitente. Evite imprimir este mensaje si no es estrictamente necesario. This email and any file attached to it (when applicable) contain(s) confidential information that is exclusively addressed to its recipient(s). If you are not the indicated recipient, you are informed that reading, using, disseminating and/or copying it without authorisation is forbidden in accordance with the legislation in effect. If you have received this email by mistake, please immediately notify the sender of the situation by resending it to their email address. Avoid printing this message if it is not absolutely necessary. _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com<mailto:USRP-users@lists.ettus.com> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com ________________________________ Este correo electrónico y, en su caso, cualquier fichero anexo al mismo, contiene información de carácter confidencial exclusivamente dirigida a su destinatario o destinatarios. Si no es vd. el destinatario indicado, queda notificado que la lectura, utilización, divulgación y/o copia sin autorización está prohibida en virtud de la legislación vigente. En el caso de haber recibido este correo electrónico por error, se ruega notificar inmediatamente esta circunstancia mediante reenvío a la dirección electrónica del remitente. Evite imprimir este mensaje si no es estrictamente necesario. This email and any file attached to it (when applicable) contain(s) confidential information that is exclusively addressed to its recipient(s). If you are not the indicated recipient, you are informed that reading, using, disseminating and/or copying it without authorisation is forbidden in accordance with the legislation in effect. If you have received this email by mistake, please immediately notify the sender of the situation by resending it to their email address. Avoid printing this message if it is not absolutely necessary.

On 02/04/2021 03:30 AM, Puertas Blanco, Roberto via USRP-users wrote: > > Hi Marcus, > > My goal is to get NTP daemon running on N300 synced with GPSDO and > PPS. Could it be that the GPSDO time is internally latched with the > PPS line? If this is the case then I guess that it would not be > necessary to read the PPS. > > I have seen the “Device Synchronization” section and “sync_to_gps” > example in the USRP HW Driver and USRP Manual but I am not sure if I > have to do this if I just want to synchronize the NTP and system time > on just one USRP N300. > > Thanks, > > Roberto > > Indeed, it depends on *why* you want NTPD/GSPD on the *HOST* to "see" a 1PPS signal. If you want precise radio syncrhonization, that's already accomplished with the procedure used in sync_to_gps.**Using that procedure in your applications will guarantee that the timestamp-clock on your radio is precisely aligned to GPS time. Placing the LInux host "in the loop" will not contribute to precise time-stamps. * *In USRPs, the GPSDO module exists for the benefit of the radio, and only secondarily for the benefit of the embedded Linux host-- if it has one.