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Old 12-28-2005, 05:02 PM   #1
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USP Parallel port hanging


I'm playing with a USB media hub. It has 1 serial, 1 parallel and 1 USB.
The parallel is "BAY-3U1S1P" and works just fine kernel wise.

But.. When I write ANYTHING to the port, my controller card on the other end (which i know for sure works on non-USB parallelports) lights the correct status leds but then the port is "blocked".

Read on the port will never finish and if I write anything again to it it will be ignored.
If I unplugg the mediahub and then reconnect it and then resend the new data, it will be OK for that data, and go back to it's "locked" state, accepting no inputs/outputs.

I'm using /dev/usb/lp0 as I haven't found any way to use ioperm via base I/O.
I have tried with both echo, open(), fopen(), write(), fwrite() and dd. Same issue

Is this just my media hub or is it a known problem with usb stuff? Have I missed some option or some handshake? Buggy kernel? (, Gentoo -r4)

Thanks in advance!
P.S Also, how can I controll bidirectional while using fopen/open and not the base I/O+2? D.S


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