4 years, 10 months ago.

I cannot seem to program my FRDM-K64F board


I am new to this FRDM-K64F board and mbed. I am trying to program the helloworld example bin to the board. Most of the time I got "SWD ERROR" in fail.txt file. Sometimes the program seems to be running (I see the red LED blinks and no fail.txt file) but the red LED blinks 2 seconds then stops. If I power cycle the board or push the reset button, nothing happens (the red LED doesn't blink.).

Also, I noticed that my board constantly resets by itself (the fail.txt has "TIMEOUT" in it).

Anybody knows anything about this issue?

Thanks in advance,


Question relating to:

The Freedom-K64F is an ultra-low-cost development platform for Kinetis K64, K63, and K24 MCUs.

1 Answer

4 years, 9 months ago.

Hi Nick,

I had the same issue, got it resolved with update to the latest mbed Interface firmware as described here https://developer.mbed.org/handbook/Firmware-FRDM-K64F. Original FW on the board was from 2014 and probably caused some issues with newer mbed code.