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Fish
Associate II
January 15, 2022
Question

stm32f4 usb high speed cdc RX Bug?

hi, i'm using stm32f4 mcu for lots of periph.

the usb communication (2.0 high speed) of my project has a problem

there is no problem between my desktop pc and mcu board

but, my mcu board usb does not operate properly in my laptop or others desktop pc

when i was debugging this, i found that usb character (1byte only) was received at the CDC_Received_HS(---) function

this function argument is received string length and Rx buffer pointer

i don't understand why this happens.

i also has installed virtual comport driver on my pc and desktop pc (OS is window 10 pro)

anyone help

thanks.

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1 reply

Walid ZRELLI
Visitor II
January 21, 2022

Hello @Fish​ ,

You can refer to the following example provided under our F4 Firmware Package:

  • Projects\STM32469I_EVAL\Applications\USB_Device\CDC_Standalone

BeST Regards,

Walid