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TM4C1290NCPDT: USB Composite device

Fortunato Marrelli
Prodigy 225 points
Part Number: TM4C1290NCPDT

Tool/software:

Hi,

I am using TM4C1290 microcontroller.

I set up a composite USB device with 3 serial ports. My question is

Am I correct if i suppose that the order of ports recognized by windows is the order

of my descriptor interface?

Is it possible, that Windows does a mess and do not respect this order?

Thanks for the reply.

Regards

  • 0
    TI__Guru**** 191486 points

    Hi,

    Fortunato Marrelli said:

    Am I correct if i suppose that the order of ports recognized by windows is the order

    of my descriptor interface?

    That is more a question for Windows. I cannot answer how Windows is doing its thing. During enumeration, Windows host will send GET_DESCRIPTOR and other commands. The device will reply the device description as part of the enumeration handshakes. How Windows interprets in whichever order is really beyond my knowledge. You might want to check with Microsoft about it. Having said that, why is that important to you? They are enumerated as three different COM ports.  A composite could be anything (e.g. a HID mouse and a HID keyboard). Is the order between a keyboard and a mouse important to your application?

  • 0 in reply to Charles Tsai
    Prodigy 225 points

    Unfortunatelly each port has its own protocol. I cannot implement on host side something to know what port is for.

    Thanks anyway