Hi,
You may find useful this posts on the MCU on Eclipse blog by Erich Styger:
USB MSD Host for the FRDM-K20D50M Board | MCU on Eclipse
USB CDC with the FRDM-K20D50M | MCU on Eclipse
Check the information there and say: Thank you Erich!.
Hope this information can help you,
Best Regards,
Adrian
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