49 lines
954 B
Go
49 lines
954 B
Go
package main
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import (
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"machine"
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"machine/usb/adc/midi"
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"time"
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)
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func main() {
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// buttons: active LOW (internal pull-up)
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btnA := machine.P1_06
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btnB := machine.P1_04
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btnRot := machine.P0_22 // rotary encoder push button
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btnA.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
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btnB.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
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btnRot.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
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// C major triad: C4, E4, G4
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notes := []midi.Note{midi.C4, midi.E4, midi.G4}
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midichannel := uint8(1)
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note := -1
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oldNote := -1
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for {
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note = -1
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if !btnA.Get() {
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note = 0 // C4
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}
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if !btnB.Get() {
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note = 1 // E4
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}
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if !btnRot.Get() {
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note = 2 // G4
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}
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if note != oldNote {
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if oldNote != -1 {
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midi.Midi.NoteOff(0, midichannel, notes[oldNote], 50)
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}
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if note != -1 {
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midi.Midi.NoteOn(0, midichannel, notes[note], 50)
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}
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oldNote = note
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}
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time.Sleep(100 * time.Millisecond)
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}
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}
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