Hum... looks like it's not as easy as just changing interrupt polarity...
Help anyone?![Question :?:]()
Help anyone?

- /* ----------------------- Optional MCU Description ------------------------ */
/* The following configurations have working defaults in usbdrv.h. You
* usually don't need to set them explicitly. Only if you want to run
* the driver on a device which is not yet supported or with a compiler
* which is not fully supported (such as IAR C) or if you use a differnt
* interrupt than INT0, you may have to define some of these.
*/
#define USB_INTR_CFG MCUCR
//#define USB_INTR_CFG_SET ((1 << ISC00) | (1 << ISC01))
#define USB_INTR_CFG_SET (1 << ISC01)
#define USB_INTR_CFG_CLR 0
#define USB_INTR_ENABLE GIMSK
#define USB_INTR_ENABLE_BIT INT0
#define USB_INTR_PENDING GIFR
#define USB_INTR_PENDING_BIT INTF0
#define USB_INTR_VECTOR SIG_INTERRUPT0