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Custome board with stm32f427 USB failure

Question asked by Paul Hamberg on Apr 23, 2018
Latest reply on Apr 25, 2018 by Clive One

Hi,

I am developing a custome board with the stm32f427.

I cannot get the USB to connect to the PC. I allways get the number 43 error "USB device unknown"

The builtin bootloader is loaded and I can see the code running on the MCU. And I can talk to the board via USART.

I use a USB type B as a connection.

 

Can anyone help me?

 

Thanks in advance!

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