Messages in this thread | | | From | Tim Sander <> | Subject | ptp device strangeness | Date | Fri, 01 Sep 2017 17:28:34 +0200 |
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Hi
I am currently using ptp on a Altera/Intel SOC with a dp8640 PHY. PTP functionality seems to be right. But i am doing timestamping with gpio0 and sometimes i loose the sync of the stamping and the events. So i would like to read out all messages. Reading O_NONBLOCK does not work so i tried polling from usermode with the below code:
np = poll(&ev, 1, 0); ev.fd=ptpDev; ev.events = POLLIN; if (np>0) { if (ev.revents>0) { std::cout<<"discarded ptp event"<<std::endl; read(ptpDev, &event, sizeof(event)); } But as confirmed in the debugger np=1 and read blocks forever. I don't think that this is correct behavior?
For pinning down this misbehavior I would like to know it this is a local problem of my hardware or if this is a general problem with the ptp chardev interface?
I am currently on 4.11.12. As this is the latest preempt rt release.
Best regards Tim
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