Author Topic: atmega32u4 customer board device manager doesn't recognise  (Read 361 times)

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Offline Harmony

  • Newbie
  • Posts: 3
  • Country: au
atmega32u4 customer board device manager doesn't recognise
« on: February 21, 2019, 05:51:35 pm »
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.
 

Offline up8051

  • Regular Contributor
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  • Posts: 60
  • Country: pl
Re: atmega32u4 customer board device manager doesn't recognise
« Reply #1 on: February 21, 2019, 08:56:50 pm »
Set Fuse-Bits as below.
lowFuse  0xFF     , highFuse 0xD9      ,extendedFuse 0xC3
 

Offline jackthomson41

  • Contributor
  • Posts: 26
  • Country: us
Re: atmega32u4 customer board device manager doesn't recognise
« Reply #2 on: February 23, 2019, 02:17:50 am »
Did you upload Arduino bootloader in Atmega32 ???
 

Offline Sarcarean

  • Contributor
  • Posts: 26
  • Country: us
Re: atmega32u4 customer board device manager doesn't recognise
« Reply #3 on: February 27, 2019, 09:10:56 pm »
"Unknown USB device" usually means the base driver is loaded. Try and load the Atmel FLIP driver or the generic LIBUSB driver.
 


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