AnsweredAssumed Answered

FRDM-K64F booting issue when powered from USB port

Question asked by Hami Monsarrat-Chanon on Oct 8, 2014
Latest reply on Oct 6, 2015 by Loic Guillain

I am facing an issue when powering the FRDM-K64F board from its USB port.

If I leave the board without power for more than 10 seconds, the card would never boot

powered from the port. I have to disconnect it and reconnect it within that 10 seconds period.


The problem can lead to different symptoms depending on the host.

I originally worked on this in the mbed community context. More details about the issue can be found

in the following post: USBDevice on FRDM-K64F sometimes crash my laptop - Question | mbed


In my USB device application, that powering issue is a serious blocker.

Any help would be appreciate.

Since we are basing the development of our custom board on the FRDM-K64F schematic,

we need to solve this before going forward.