The latest firmware version for the FRDM-K22F is: 0221 To check your firmware version:

• Open the DETAILS.TXT file if present.
• If not present, open the MBED.HTM file on your mbed microcontroller with a text editor

The latest mbed interface upgrade file for the FRDM-K22F is 0221_k20dx128_k22f_0x8000.bin

Enter Bootloader Mode¶

1. Disconnect all power, external circuits and USB cables.
2. Press and hold the button marked RESET (circled in picture)
3. Connect a USB cable as shown in the picture
4. The drive should mount named BOOTLOADER
5. The reset button can now be released
   

Update using Windows and Linux¶

1. Download the interface firmware file to your hard disc
2. Drag and drop the file onto the USB drive named BOOTLOADER
   

Update using Mac¶

1. Download the interface firmware file to your hard disc
2. In a terminal run the following commands

sudo mount -u -w -o sync /Volumes/BOOTLOADER ; cp -X <path to interface update file> /Volumes/BOOTLOADER/

Power Down, Power Up¶

Disconnect the USB cable and reconnect. The drive should now be named MBED. You can verify the version number as indicated above. That's it!

Interface Firmware Changelog¶

rev 0221 [ ... ]

• Update disc format and emulation for Mac Yosemite
• CDC and HID endpoints don't disconnect when programming via MSC drag 'n drop
• Only erase sectors in target flash that are needed for the new program
• New details text file for information about the version and build
• Add check for stack overflow and adjusted the task stack sizes

rev 0203 [ ... ]

• Initial release

The latest firmware version for the FRDM-K22F is: 0203. 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 :

• 0203_k20dx128_k22f_0x8000.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!¶