What do I do when my FRDM-K64F no longer shows up as a COM port or mass storage device?

[dave408]

I just copied my .bin from the mbed online IDE onto my FRDM-K64F, and this time it did not come up as a COM port in the Windows Device Manager.  So I reset it, and that didn't help.  Then I unplugged it and reconnected it, and windows just tells me "USB Device Not Recognized".  My code is running because the RGB LED is doing what it's supposed to do.  Can anyone tell me how to fix the problem?

[BlackNight]

My guess is that this corrupted the firmware file (which runs on top of the bootloader). I suggest you reload/program the debug firmare.

See Firmware FRDM K64F - Handbook | mbed how to do this.

Otherwise, this one might help: http://mcuoneclipse.com/2014/04/19/recovering-frdm-k64f-mbed-board/

Maybe even your bootloader is corrupted. In that case, you will need a JTAG/SWD programmer (Segger J-Link or P&E Multilink).

Erich

[dave408]

Thank you, Erich!  I had more to say, but the forum isn't accepting the text from my previous reply for some reason...

[Kan_Li]

Hi  Dave408,

I have experienced familar issue, but I didn't fix it either, what I do is using the jlink firmware instead, please follow the steps listed in SEGGER - The Embedded Experts - OpenSDA / OpenSDA V2 , I guess on your FRDM-64F, opensda is v1.

Hope that helps,

Have a great day,
Kan

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[dave408]

Thanks, I will look into it!