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Is it possible to run both USB Host and USB Device controllers on top of an AVR (ATMega64)? Specifically, what I'm looking for is to receive data from a usb keyboard, and simultaneously sending keystrokes to a PC.

From what I've seen, both VUSB & LUFA stacks support USB host modes, but they work with a single usb port only.

Any help is appreciated! Thanks!

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  1. I don't think that V-USB supports host (OTG) mode and LUFA host mode will require at least an AT90USB646 which is quite expensive.

  2. I don't know about a cheap micro that has 2 USB port but you may try using two. Just connect them via an UART and exchange the needed information.

That said, davr is probably right that using a PS/2 keyboard would be simpler.

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You might consider using a PS/2 keyboard, they are simple to interface with, it's basically just a serial protocol. Then you can still use USB in Device mode to connect to the host PC.

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    \$\begingroup\$ You can even make it look like fake USB - many keyboards I have seen are dual-mode USB and PS/2. You could have a USB connector wired up like the "USB to PS/2" adapter and just interface using PS/2. Don't know if the requirement is USB or just a keyboard with a USB connector. \$\endgroup\$
    – W5VO
    Commented May 2, 2010 at 7:59
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    \$\begingroup\$ IIRC most of these keyboard and mouse adapters did not contain any logic and required the mice/keyboards to have true USB signals on the PS/2 connector (which has 2 unused pins). \$\endgroup\$
    – jpc
    Commented May 2, 2010 at 16:26
  • \$\begingroup\$ Actually I'm looking for a way to work with a real USB keyboard, but in case that will get complicated, I'll sure go with the PS/2 option. Thanks for the advice! \$\endgroup\$
    – mentalist
    Commented May 2, 2010 at 23:32

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