OMG it works !
I press the reset button and Windows detects it automatically.
Okay, that's good to know.
In that case, what I'll do is add code to reboot the KL25Z if it's in the initial connection state (short yellow) and times out. It doesn't currently reboot itself from that state, because that's already the freshly booted state: rebooting from that state is rebooting from a reboot, which hasn't been necessary on any other machines. But apparently you have a motherboard where even being in the reboot state isn't good enough - the device apparently has to actually cycle through a reboot after the PC side is powered up.
The short yellow flashes mean that the KL25Z already rebooted itself, so there's basically nothing else it can do except wait for Windows to accept the connection.
Actually I may disagree, since the KL25Z is doing short yellow flashes from the beginning, so no new status or moves from the board here.
No, it actually is in a freshly booted state - that's what short-yellow means. It means the device was just reset, either by being power-cycled or via a software reset.
Hello mjr,
I actually have the same problem:
when booting the PC with attached KL25Z board the board is not registered. LED shows short yellow flashes.
Once I press the reset button or disconnect and reconnect the USB cable it is registered correctly and working just fine.
Is there a possible solution to that so that I can power on the PC with a working KL25Z board?
Many thanks for your answer.
best regards




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