I am having trouble copying files to my FRDM-KL25Z boards. When it works a dialog box briefly appears saying "Copying 1 item" and the transfer is successful and the program starts running. In the failure mode the dialog box does not appear, the file name appears instantly in the FRDM-KL25Z Windows Explorer window, and the small LED associated with the OpenSDA interface flashes quickly - 7 or 8 flashes and a pause - repeatedly.
This behaviour is intermittent. I cannot see a pattern. I get the same result with several FRDM boards, with two laptops (both Windows 7). I have the latest PE Micro OpenSDA firmware loaded and the latest USB drivers on both machines.
I believe the FRDM-KL25Z hardware is working as (a) the boards always enumerate as FRDM-KL25Z disk drives, (b) I have no trouble updating OpenSDA firmware and (c) even if the download fails the previously loaded KL25Z
firmware continues to run.
It feels like a device driver fault or a USB fault, or perhaps a fault with the connection between the two processors on the FRDM board. Has anyone else seen this problem? How do I fix it? Help!