Oleg put his code at GitHub - felis/USB_Host_Shield: Libraries and code for Circuits@Home Arduino USB Host Shield. I am running the 'board test' found in the examples directory of the link above. When I get to the place in the code in the function 'usbtest' that does :
case( USB_ATTACHED_SUBSTATE_GET_DEVICE_DESCRIPTOR_SIZE ):
printProgStr(PSTR("\r\nSOF generation started. Enumerating device."));
break;
case( USB_STATE_ADDRESSING ):
printProgStr(PSTR("\r\nSetting device address"));
//delay( 100 );
break;
the function 'Usb.Task' returns the error code from the MAX3421 chip.