Ahh, thank you very much! It works!!!! =) Greetings Matthias On Sunday 09 December 2007 15:21:31 Charles Lepple wrote: > On Dec 9, 2007, at 5:14 AM, Matthias Lohr wrote: > > hid_interrupt_write() > > > > What is the "ep" parameter? > > bEndpointAddress for EP 2 OUT, so 0x02 > > For hid_interrupt_read() it would be 0x81