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Replying to @josecastillo

The bi-color LED has two pins: one for red, and one for green. They’re connected to pins PA20 and PA21. This pin mux table shows that you can use these as TC3/WO[0-1] (Timer/Counter 3, Waveform Output 0/1). But you can also use them as TCC/WO[6-7]. (the buzzer is PA27, TCC/WO[5])

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