[clug] Single Board Computer with two OTG USB interfaces. Suggestions?

Bob Edwards bob at cs.anu.edu.au
Fri Mar 10 00:54:57 UTC 2017

On 10/03/17 11:20, jm wrote:
> Two thought of dubious value:
>  1. Have you looked a the SPI bus? That is fast enough to support
> ethernet interfaces. This could be connected between two boards then the
> onboard ethernet used to connect to the two networks.

Good point. SPI would be (much) faster than Serial and you could simply
not connect the reverse channel, so just a clock and the data in one

As with any data diode, you would have to be very careful not to drop
bytes at the receiver as there is no way to signal a retransmit...

Another way to do it would be to use the Ethernet port, but connect to
a dummy switch port (to get the link status signal). Then "tap" the
TxD line from the sender into the RxD of the receiver, which would be
operating in promiscuous mode.

> 2. The Beagle Bone Green comes with four USB ports and the Samsung
> Arktik various numbers of USB ports depending on the model.

http://wiki.seeed.cc/BeagleBone_Green/ says 1 x USB client (also used
for power) and 1 x USB host.


Bob Edwards.

> Jeff.

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