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Dependents: hello SerialTestv11 SerialTestv12 Sierpinski ... more
1) are you sure you online in used mBed2 compiler to developed? or 2) are you sure your device is on the list?
i was in used LPC1768 was OK, .... i just write a LED lighting On/Off function tested. or you can tried this follow link: https://os.mbed.com/users/simon/code/HelloWorld/docs/03c191369089/main_8cpp_source.html
Others... if you downloads the zip and in used yourself choice compiler e.g. Keil....etc. you need search the community topic ... as long time ago having post.... i forgot the record. (and i feels online is very good compiler, but i stay at mBed2 only, because i build things mostly about electronic, having IoT but not totally in core section program ... modular programming)
Good Luck