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Avnu / OpenAvnu

OpenAvnu - an Avnu sponsored repository for Time Sensitive Network (TSN and AVB) technology
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Listener/Talker example Raspberry pi2 #786

Closed tengandreaxu closed 6 years ago

tengandreaxu commented 6 years ago

Dear all, I'm following this project since a while and I would like to know if there are any chance to run the simple listener/talker example described in /documents/examples using two raspberries. I also know that in order to run the gptp technology we need a required ethernet adapter in the specific I have found on the issues the Intel l210, but I would like to know if there are is a way to bypass this problem on the raspberries, with lower performance obviously (the time synchronization is not guaranteed in a small microseconds window (?)).

Thank you for you attention Best regards

andrew-elder commented 6 years ago

I don't think this is possible. You could do something to transfer audio, but it wouldn't be AVB. 802.1AS states that a port is asCapable when the measured pDelay is 800 nanoseconds or less. Without hardware time-stamping of PTP packets (which the Raspberry Pi does not have), there isn't a good way to compute the pDelay with sub microsecond accuracy. The Beagle Bone family does support h/w time stamping and so do any iMX6/iMx7 based deices. They would be a better choice for trying things out.

tengandreaxu commented 6 years ago

Got it, thanks for the fast reply andrew-elder