Virtual COM Port CDC on STM32F4-Discovery

Posted on July 29, 2013 at 11:59

Hi all,

I try to implement a CDC Device on STM32F4-discovery.

I made an IAR project based on the VCP example project of the STM32_USB-Host-Device_Lib_V2.1.0.

The STM32-Discovery starts correctly but two ''STM32 Virtual ComPort in FS Mode'' starts on my PC when I Plug the OTG connector on it.

When I analyze the USB frames on USB with USBlyzer, I see that two answer are returned on the getDescriptor.

Why do I have 2 answers on the getDescriptor?

Bets regards,

Pascal

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