--------------------------------------------------------------------------------
Nano 33 BLE Sense --- Arduino nRF52840 module (Nano 33 BLE Sense)
    By Kenji Arai / JH1PJL
        http://www7b.biglobe.ne.jp/~kenjia/
        https://os.mbed.com/users/kenjiArai/

        February  28th, 2021
--------------------------------------------------------------------------------
Board Information
        https://store.arduino.cc/usa/nano-33-ble-sense
        https://www.st.com/ja/ecosystems/arduino-nano-ble-33-sense.html#overview

------- Mbed Online Compiler ---------------------------------------------------

Target:         nRF52840-DK
mbed-os:        mbed-os6.8.0
Select program:
            Open select_example.h
            Change EXAMPLE_NUMBER (line31)
Compile:
<!!!! CAUTION !!!>
            You can compile without error.
            Created hex file does NOT run on Nano 33 BLE Sense board!!!!!.

------- Mbed Studio ------------------------------------------------------------

Target:         ARDUINO_NANO33BLE
Mbed Studio:    1.3.1
Select program:
                Same as online program
Compile:
            You can compile and use a hex file for the board.
How to write hex file into the board:
            Need prepare DAPLink (use SWDIO & SWCLK line).
<!!!! CAUTION !!!>
            Orignal board has Arduino bootloarder and 
            Mbed hex file overwrites it.
            As a resule, you cannot use Arduino bootloarder anymore.
