ASF USB CDC com port

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I am testing with the ASF USB CDC sample project for my Xmega128a4. There is an atmel supplied driver.

When I install the driver on my main Win7 machine, it uses COM10, even though there is already a COM10 port. I uninstalled and reinstalled this driver while I was using COM10, but it still installed it as COM10.

When I installed it on another Win7 installation, it installed on COM15 which was good because I don't have another COM15. I wish it would use COM15 on my main Win7 installation.

What is going on? How does it decide what COM port to use?

I suppose I can change my existing COM10 to use another COM port, but I shouldn't have to do that.

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If you go to Device Manager and look at the properties of the driver there should be an option there to forcibly assign a COM port number.

Alternatively, if you have more than one USB port on the PC, plug it into a different one - you should find it gets a different number anyway.

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Thanks. I changed it to port 15 from the driver properties option.