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Buttons + Tones

An original CC0 bare-metal micro:bit V2 program: it enables pull-ups on the button pins (P0.14 / P0.23) and reads them from the GPIO IN register, showing a neutral face by default, a happy face plus an 880 Hz beep while A is held, and a sad face plus a 220 Hz beep while B is held. Exercises the real button hardware and the PWM speaker together.

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Format: nRF52 flash image (bare-metal, compiled C)  ·  By: emulators.org  ·  Licence: Public domain (CC0)