USB keyboard in hostmode?
jayv at synth.net
Tue Aug 19 14:10:50 CEST 2008
> Maybe i should test it with a more simple usb keyboard without any
You should test your USB keyboard with the Freerunner, using a USB
*HUB* in between, and see if that doesn't fix things. IFAICT, there
are details not-yet-well-understood regarding the nature of the
termination and 'pull-up' resistor normally included on standard USB
Host ports which may not be included with the Freerunner hardware
design - meaning a simple female/female convertor isn't going to be
enough, there will need to be a cap and a resistor included in the
schematic in order to make the USB Host controller onboard the
Freerunner believe it is talking to a proper USB hub node. If this
isn't there, the controller believes its only got a single device to
talk with, physically, and in your case this isn't true - you've got
two devices onboard. So, you need the cap and resistor, I bet.
Easiest way to get them: put a USB hub in between, and see if that
makes things better.
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