Re: [Xenomai-help] Two real time NICs in same PC? (RTnet)

[Benjamin Biegel]

Thanks! I can see in the source that the capture stamping uses the rtdm_clock_read(). When several PCs are on the same RTnet, they get synchronized due to the TDMA. But what clock is it that is synchronized on the PCs? How do I read and use this clock? What file can i see this in? Would it be possible to stamp received frames through this synchronized clock instead of the system clock? Thanks a lot :) Benjamin Jan Kiszka wrote: Benjamin Biegel wrote: I have only found documentation about the possibility to run a non-RT-NIC and a RT-NIC at the same time, which is possible. But is it possible on the same PC to have: - One NIC being master or slave in an RTnet network - One other NIC capturing frames with RTcap ? Yes, this is possible. It is even the default if you use RTnet's startup script and config (only one NIC is configured, and if there are two NICs of the same type, only the first one is claimed by RTnet). (The whole point is to have a network of PCs running RTnet, so that their clocks are synchronized. Then have these same PCs capture frames via RTcap. In this way the captured timestamps can be compared and Ethernet frame travel times can be calculated.) Note that the measurement jitter /may/ still be in the same order of your travel delays. Jan

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