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.