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How to implement a Virtual Com Port on USB Host in STM32F4xx?

Question asked by sheldon.cortexman on Apr 24, 2015

I use the library(STM32_USB-Host-Device_Lib_V2.1.0). 
I run the example "USB_Device_Examples\VCP"
I find STM32F4xx as USB Device in the example.
But in my design, STM32F4xx will be as USB Host on VCP. Because I require many com ports.

1.   STM32F4xx  as USB Host,  other chips as USB device,  communication by Virtual Com Port.   Current USB Library  can do it ?
2.   If first can do,  How many virtual com ports will be virtualized? 
3.   If first and second can do, What to do?