Matthew Dharm wrote:
>
> I realize I might have issues with the question of "can I switch this port
> off".... but, the question still stands: will a turned-off port cause the
> device to disconnect?
I think that it probably won't. This is based on the way device detach/attach
is detected, since the normal way is to just short D+ or D- (depending on
speed) to ground through a resistor. Since ground remains, the device won't
signal a detach / attach to the upstream port hub.
> For that matter, does the commands to turn off a port work on root hubs?
I wouldn't guarrentee they work at all. Stage 1 of your test program would be
unit tests on this functionality :)
> For my testing, I can require the hubs I want without any problems... but I
> still need to know if what I'm thinking will work for my needs....
I think that for testing, it would be really good to have a programmable
switch "in-line" in a normal USB cable that connected GND, then power, then D+
and D-, just like a real plug-in does. It should be pretty easy to do with a
USB microcontroller and a CMOS switch device...
Brad
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