Prior to a couple of weeks ago, we have quite a few FRDM-K22F. We recently got 4 FRDM-K22F. It came in NXP boxes. When plugs in, it shows up only as "BOOTLOADER" drive, not an "MBED" drive. These files are on the drive and dated 12/14/2012:
.fseventsd (this is a folder)
I have enough experience that I was able to load MBED firmware (0221_k20dx128_k22f_0x8000.bin) onto the tiny OpenSDA K20 via J10 (its JTAG). MBED is now showing up when plugs in. But MCUXpresso has problem to download my application to start debugging session:
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with warning box saying:
02: Failed on connect
Wire ACK Fault in DAP access
Probe(0): Connected&Reset. Was: NotConnected. DpID: 00000000. CpuID: 00000000. Info: <None>
Are these really old boards?? Is there a way to get this problem fixed?? Otherwise, we need to return these boards and get replacement.
Note: on the two microUSB connectors, there is stamp of "6H1".