The latest firmware version for the FRDM-K22F is: ff02. To check your firmware version, open the MBED.HTM file on your mbed Microcontroller with a text editor.

These instructions explain how to upgrade your firmware.

1. Save the latest firmware in bootloader mode¶

While holding down the small button between the USB connectors, plug the Freedom board into the connector marked SDA - the bottom one as shown.

When the FRDM-K22F is plugged in this way, it will appear as a disk called BOOTLOADER which you can simply copy the update file onto.

The latest mbed interface upgrade file for the FRDM-K22F is :

• 20140717_k20dx128_k22f.bin

2. Power cycle the board to update the firmware¶

After you have copied on the file onto the FRDM-K22F, simply unplug it, and plug it back in again, and the the USB disk will appear and an mbed disk.

3. Finished!¶

Firmware changelog¶

rev ff02 [ ... ]

• HID interface now expects the IO to be pre-configured and connected to the target before USB is exposed for use
• HID interface puts target into reset program state (Halt) when connect is called.
• Placeholder for UUID in redirect URL
• Validate target NVIC address 0 for a valid RAM address before boot
  • If NVIC is valid the target is released to run
  • If NVIC is invalid the target is held in hardware reset (bright red LED)

rev 0203 [ ... ]

• Initial release