changed message handling, added light & screen operations, updated API

Author: antoi-ne

README.md

@@ -1,4 +1,4 @@
 # `mikro`
 [![Go Reference](https://pkg.go.dev/badge/github.com/antoi-ne/mikro.svg)](https://pkg.go.dev/github.com/antoi-ne/mikro)
 
-Go driver for the Native Instruments Maschine Mikro Mk3.
+Go driver for the Native Instruments [Maschine Mikro Mk3](https://www.native-instruments.com/en/products/maschine/production-systems/maschine-mikro/).

api/mk3/mk3.bitproto

@@ -38,4 +38,13 @@ message LightState {
     ColoredLight[39] buttons = 2
     ColoredLight[16] pads = 3
     ColoredLight[35] strip = 4
+}
+
+message ScreenState {
+    option max_bytes = 265
+
+    byte[3] magic1 = 1
+    byte screen_portion = 2
+    byte[5] magic2 = 3 
+    byte[256] pixels = 4
 }

api/mk3/mk3_bp.go

@@ -1,65 +1,108 @@
 package mikro
 
+//go:generate go run golang.org/x/tools/cmd/stringer@latest -type=Button -trimprefix Button
 type Button int
 
 const (
 	// Browser Section
 
-	ProjectButton Button = iota
-	FavoritesButton
-	BrowserButton
+	ButtonProject Button = iota
+	ButtonFavorites
+	ButtonBrowser
 
 	// Edit section
 
-	VolumeButton
-	SwingButton
-	TempoButton
-	PluginButton
-	SamplingButton
+	ButtonVolume
+	ButtonSwing
+	ButtonTempo
+	ButtonPlugin
+	ButtonSampling
 
-	ArrowLeftButton
-	ArrowRightButton
+	ButtonArrowLeft
+	ButtonArrowRight
 
 	// Performance section
 
-	PitchButton
-	ModButton
-	PerformButton
-	NotesButton
+	ButtonPitch
+	ButtonMod
+	ButtonPerform
+	ButtonNotes
 
-	GroupButton
-	AutoButton
-	LockButton
-	NoteRepeatButton
+	ButtonGroup
+	ButtonAuto
+	ButtonLock
+	ButtonNoteRepeat
 
 	// Transport section
 
-	RestartButton
-	EraseButton
-	TapButton
-	FollowButton
+	ButtonRestart
+	ButtonErase
+	ButtonTap
+	ButtonFollow
 
-	PlayButton
-	RecButton
-	StopButton
-	ShiftButton
+	ButtonPlay
+	ButtonRec
+	ButtonStop
+	ButtonShift
 
 	// Pads section
 
-	FixedVelButton
-	PadModeButton
-	KeyboardButton
-	ChordsButton
-	StepButton
-
-	SceneButton
-	PatternButton
-	EventsButton
-	VariationButton
-	DuplicateButton
-	SelectButton
-	SoloButton
-	MuteButton
-
-	EncoderButton
+	ButtonFixedVel
+	ButtonPadMode
+	ButtonKeyboard
+	ButtonChords
+	ButtonStep
+
+	ButtonScene
+	ButtonPattern
+	ButtonEvents
+	ButtonVariation
+	ButtonDuplicate
+	ButtonSelect
+	ButtonSolo
+	ButtonMute
+
+	ButtonEncoder
 )
+
+type ButtonMessage struct {
+	pressed uint64 // bitflag of all currently pressed buttons
+
+	encoderTouched  bool
+	encoderPosition uint8
+
+	stripPos1 uint8
+	stripPos2 uint8
+}
+
+func (b *ButtonMessage) IsButtonPressed(btn Button) bool {
+	return b.pressed&(1<<btn) != 0
+}
+
+func (b *ButtonMessage) PressedButtons() []Button {
+	var pressed []Button
+
+	for idx := 0; idx < 64; idx++ {
+		if b.pressed&(1<<idx) != 0 {
+			pressed = append(pressed, Button(idx))
+		}
+	}
+
+	return pressed
+}
+
+func (b *ButtonMessage) IsEncoderTouched() bool {
+	return b.encoderTouched
+}
+
+func (b *ButtonMessage) EncoderPosition() uint8 {
+	return b.encoderPosition
+}
+
+func (b *ButtonMessage) StripPosition() uint8 {
+	return b.stripPos1
+}
+
+func (b *ButtonMessage) StripSecondPosition() uint8 {
+	return b.stripPos2
+}