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STM32Cube USB CDC Unknown USB Device

Question asked by Ita Dab on Jan 24, 2018
Latest reply on May 8, 2018 by Imen D

im lost! im trying to create usb cdc in STM32F405RG

the only thing im doing is to configure usb_fs as device and the usb class as a communication device class than i generate a code in STM32CUBEMx when using STM32L4 board the usb recognized as a CDC in the pc but regarding the STM32F405RG i get unknown usb device in the device manager.

this problem happening  in every STM32F4 board i used. it is like that STM32CUBEMX not working proparly.

can someone help me? thaks a lot!