Win-7 and USB-CDC

[oaf]

Hi,

I'm working on a FRDM-K64 with a USB-CDC sw. After some problems I'm now able to sometimes get it to connect to my PC and communicate.

For the moment I'm using Win-7, TeraTerm and the FRDM-K64.

When I stop my target windows removes the serial port, (pling-plong) and TeraTerm disconnects.

When restarting the target windows re-connects the serial port, (pling-plong), but often the serial-port is not visible to TeraTerm,

(COM-24 is not visible in the COM drop-down list). The Computer --> Manage --> Device Manager shows COM-24 as OK and working.

I've tried to disconnect the COM-24, and re-connect. The re-connect typically ends in an infinite loop, and I have to re-boot my PC.

How am I supposed to do development work on the CDC device???

[DavidS]

Hi Ole,

That seems to be typical operation.

If the Kinetis device disconnect and the PC application does not disconnect prior to the Kinetis "re-connecting" then the connection is not possible.

My general rule of thumb is that once the Kinetis device disconnects, I close out the terminal utility.  Once Kinetis re-enumerate, then open the terminal utility.

Not sure there is any other workaround.

Regards,

David