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Beginning BBC micro:bit: A Practical Introduction to micro:bit Development by Pradeeka Seneviratne

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Appendix A: Updating DAPLink Firmware and Using REPL with Tera Term

This appendix explains how to update the DAPLink firmware on the micro:bit by using maintenance mode. It also shows you how to use REPL (Read-Evaluate-Print-Loop) with Tera Term, a serial terminal program.

DAPLink Firmware

The firmware on the micro:bit is stored inside a separate interface chip called the KL26 . This firmware is known as DAPLink. It is the responsibility of this firmware to connect to the USB port and to allow you to drag and drop .hex files that are then programmed into the application processor.
If you want to determine what firmware is loaded in the KL26 interface chip, plug it in and open it in your file manager. Then look inside the details.txt file

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