Developing a MIDI USB driver for OSX

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Hi,

I'm building a custom MIDI controller. For that i'm using a AVR microcontroller. I want to support USB and for that i need to implement the USB in the same chip of the controller. That will bring me the need to write a driver because the chip can support full speed and the USB MIDI protocol requires full speed.

My idea is to take advantage of a project called AVR HID which implements a low cost USB device. I just need to make the conversion between the HID to MIDI.

Does anyone knows how to do it or can point me information in that direction?

Best regards,

Nuno