Hi,
I design my own pcb with ATmega2560 + ATmega16U2 like an official mega card.
I burn bootloader into 2560 and 16U2 with an UNO and the nick gammon's sketch.
USB are not recognized. I'm not able to find the drivers for USB\VID_03EB&PID_2FEF.
Any advices ?
Thanks.
I've solved my issue.
I have burn the bootloader with my dataman isp programmer and the Arduino-COMBINED-dfu-usbserial-atmega16u2-Mega2560-Rev3.hex file.
The difficult is to find the good combination with the fuses and lock bytes.
Lfuse=EF
Hfuse=D9
Efuse=F4
Lock byte=CF
It works now.