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CDC virtual COM port initial connect failure

Question asked by Hitesh Patel on Jan 2, 2013
Latest reply on Jan 3, 2013 by Hitesh Patel



I have an application that communicates over the OpenSDA virtual CDC COM port (using MSD-FRDM-KL25Z_Pemicro_v107.SDA).

It works fine once connection is established, but I fail to get initial communications working.

Here is the scenario, if I unplug and replug the device into the USB port I reliably see the MSD FRDM-KL25Z

and an OpenSDA CDC Virtual COM enumeration. However, when I try to establish communication with a terminal program

I will generally not be able to unless I first hit the reset button on the board. In some cases the terminal program will

not be able to find the COM port even though it shows up in device manager. Is this something others have seen?

Is this something to do with virtual COM ports? Is there a solution to be able to connect after power cycle without