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deadprogram
9d6eb1ff06
such as program changes and pitch bend. Also add error handling for invalid parameter values such as MIDI channel. This however makes a somewhat breaking change to the current implementation, in that we now use the typical MIDI user system of counting MIDI channels from 1-16 instead of from 0-15 as the lower level USB-MIDI API itself expects. Also add constant values for continuous controller messages, rename SendCC function, and add SysEx function. Signed-off-by: deadprogram <ron@hybridgroup.com>
67 lines
1.3 KiB
Go
67 lines
1.3 KiB
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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// Try it easily by opening the following site in Chrome.
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// https://www.onlinemusictools.com/kb/
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const (
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cable = 0
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channel = 1
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velocity = 0x40
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)
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func main() {
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led := machine.LED
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led.Configure(machine.PinConfig{Mode: machine.PinOutput})
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button := machine.BUTTON
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button.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
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m := midi.Port()
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m.SetRxHandler(func(b []byte) {
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// blink when we receive a MIDI message
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led.Set(!led.Get())
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})
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m.SetTxHandler(func() {
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// blink when we send a MIDI message
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led.Set(!led.Get())
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})
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prev := true
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chords := []struct {
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name string
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notes []midi.Note
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}{
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{name: "C ", notes: []midi.Note{midi.C4, midi.E4, midi.G4}},
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{name: "G ", notes: []midi.Note{midi.G3, midi.B3, midi.D4}},
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{name: "Am", notes: []midi.Note{midi.A3, midi.C4, midi.E4}},
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{name: "F ", notes: []midi.Note{midi.F3, midi.A3, midi.C4}},
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}
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index := 0
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for {
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current := button.Get()
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if prev != current {
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if current {
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for _, note := range chords[index].notes {
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m.NoteOff(cable, channel, note, velocity)
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}
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index = (index + 1) % len(chords)
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} else {
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for _, note := range chords[index].notes {
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m.NoteOn(cable, channel, note, velocity)
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}
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}
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prev = current
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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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