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TMS320C5535: C55XCSL CDC module example not working

Part Number: TMS320C5535

so I managed to run the example of the cdc module:

csl_usb_cdc_example

and my pc recognize the device properly and everything.

the problem arrives when I try to open any kind of serial terminal.

I have tried putty, hyper-terminal and "advanced serial port monitor".

all gave me the same error message when I tried to open the port: "Unable to configure serial port"

any idea what's causing this and how to fix it?

I work with ccs 6, C55XCSL version 3.8, and dsp/bios version 5.42.1.09