Author Topic: atmega32u4 customer board device manager doesn't recognise  (Read 1489 times)

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Offline HarmonyTopic starter

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  • Country: au
atmega32u4 customer board device manager doesn't recognise
« 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.
 

Online up8051

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  • Posts: 288
  • Country: pl
Re: atmega32u4 customer board device manager doesn't recognise
« Reply #1 on: February 21, 2019, 09:56:50 am »
Set Fuse-Bits as below.
lowFuse  0xFF     , highFuse 0xD9      ,extendedFuse 0xC3
 

Offline jackthomson41

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  • Posts: 53
  • Country: us
Re: atmega32u4 customer board device manager doesn't recognise
« Reply #2 on: February 22, 2019, 03:17:50 pm »
Did you upload Arduino bootloader in Atmega32 ???
« Last Edit: November 11, 2019, 12:38:44 am by jackthomson41 »
 

Offline Sarcarean

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  • Posts: 31
  • Country: us
Re: atmega32u4 customer board device manager doesn't recognise
« Reply #3 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.
 


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