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Electronics => Microcontrollers => Topic started by: Harmony on February 21, 2019, 06:51:35 am

Title: atmega32u4 customer board device manager doesn't recognise
Post by: Harmony on February 21, 2019, 06:51:35 am

I have built a ATMega32u4-AU custom board (8Mhz Ceramic Resonators, 3.3V), after set the fuse: Fuse High Byte: 1001 1001 (0x99) Fuse Low Byte: 0101 1110 (0x5E) Extended Fuse Byte: 1111 0011 (0XF3), and downloaded bootloader to the chip, the device manager still shows "Unknown USB device", I cannot find which step I did wrong, please kindly point out. Many thanks.
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Title: Re: atmega32u4 customer board device manager doesn't recognise
Post by: up8051 on February 21, 2019, 09:56:50 am

Set Fuse-Bits as below.
lowFuse  0xFF     , highFuse 0xD9      ,extendedFuse 0xC3

Title: Re: atmega32u4 customer board device manager doesn't recognise
Post by: jackthomson41 on February 22, 2019, 03:17:50 pm

Did you upload Arduino bootloader (https://www.theengineeringprojects.com/2015/10/upload-bootloader-atmega328.html) in Atmega32 ???

Title: Re: atmega32u4 customer board device manager doesn't recognise
Post by: Sarcarean on February 27, 2019, 10:10:56 am

"Unknown USB device" usually means the base driver is loaded. Try and load the Atmel FLIP driver or the generic LIBUSB driver.