There is another big difference in the waveforms: The mbed clock pins are set to “low power”, so the waveforms are not properly square. The non-mbed pins are set to “high power”, so they are properly square. This is just a guess, it may be that the Sharp input pins do not accept the mbed waveform.
I think there is a way to switch the pin setting to high power, but I don’t think it is easy.
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