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Original question:

RTOS/TM4C1294KCPDT: USB CDC - USBDCDCInit() initialize params.

TM4C1294KCPDT: TM4C1294KCPDT

Jayaraj Balasubramanian
Prodigy 120 points
Part Number: TM4C1294KCPDT
Other Parts Discussed in Thread: EK-TM4C1294XL

Hi,

I have a customised board, base - TM4C1294KCPDT controller.

I have an application that uses USB CDC communication, extracted from the example provided as a part of BSP.

The host is Windows. Whenever board is connected to Host, the below control event is notified :

USBD_CDC_EVENT_SET_CONTROL_LINE_STATE.

My question is what is the application supposed to do when the above event is notified.?

Thanks,
Jay
  • 0
    TI__Guru 72500 points

    From page 56 of: C:\ti\TivaWare_C_Series-2.1.4.178\docs\SW-TM4C-USBL-UG-2.1.4.178.pdf

  • 0 in reply to Bob Crosby
    Prodigy 120 points

    Hello Bob,

    Thanks for the reply.

    I understand this from the document.

    Could you please let me know what precisely needs to be done when this event occurs?

    I mean any API to be invoked to the usb lib?

    Sorry for further query on this, as i have less knowledge on this. Would really appreciate for helping out.

    Thanks,

    Jay

  • 0 in reply to Jayaraj Balasubramanian
    TI__Guru 72500 points

    RTS (request to send) and DTR (data terminal ready) are RS232 hardware signals used in flow control. They are emulated in the USB CDC driver by this case. In the TivaWare example: C:\ti\TivaWare_C_Series-2.1.4.178\examples\boards\ek-tm4c1294xl\usb_dev_cserial, hardware flow control is not implemented and nothing is done in this case. If you want to implement hardware flow control, you should stop transmissions from the device whenever RTS (bit 1) or DTR (bit 0) is not a "1".