Added IO-Expander keyboard (#44)

kbexpander.go

@@ -0,0 +1,164 @@
+//go:build tinygo
+
+package keyboard
+
+import (
+	"tinygo.org/x/drivers/mcp23017"
+)
+
+type ExpanderKeyboard struct {
+	State    []State
+	Keys     [][]Keycode
+	options  Options
+	callback Callback
+
+	Col          []int
+	Row          []int
+	cycleCounter []uint8
+	debounce     uint8
+	expander     *mcp23017.Device
+}
+
+func (d *Device) AddExpanderKeyboard(expanderDevice *mcp23017.Device, colPins, rowPins []int, keys [][]Keycode, opt ...Option) *ExpanderKeyboard {
+	col := len(colPins)
+	row := len(rowPins)
+	state := make([]State, row*col)
+	cycleCnt := make([]uint8, len(state))
+
+	o := Options{}
+	for _, f := range opt {
+		f(&o)
+	}
+
+	for _, c := range colPins {
+
+		if !o.InvertDiode {
+			_ = expanderDevice.Pin(c).SetMode(mcp23017.Output)
+			_ = expanderDevice.Pin(c).Set(true)
+		} else {
+			_ = expanderDevice.Pin(c).SetMode(mcp23017.Input | mcp23017.Pullup)
+		}
+
+	}
+	for _, r := range rowPins {
+		if !o.InvertDiode {
+			_ = expanderDevice.Pin(r).SetMode(mcp23017.Input | mcp23017.Pullup)
+		} else {
+			_ = expanderDevice.Pin(r).SetMode(mcp23017.Output)
+			_ = expanderDevice.Pin(r).Set(true)
+		}
+	}
+
+	keydef := make([][]Keycode, LayerCount)
+	for l := 0; l < len(keydef); l++ {
+		keydef[l] = make([]Keycode, len(state))
+	}
+	for l := 0; l < len(keys); l++ {
+		for kc := 0; kc < len(keys[l]); kc++ {
+			keydef[l][kc] = keys[l][kc]
+		}
+	}
+
+	k := &ExpanderKeyboard{
+		Col:          colPins,
+		Row:          rowPins,
+		State:        state,
+		Keys:         keydef,
+		options:      o,
+		callback:     func(layer, index int, state State) {},
+		cycleCounter: cycleCnt,
+		debounce:     2,
+		expander:     expanderDevice,
+	}
+	d.kb = append(d.kb, k)
+	return k
+}
+
+func (d *ExpanderKeyboard) SetCallback(fn Callback) {
+	d.callback = fn
+}
+
+func (d *ExpanderKeyboard) Callback(layer, index int, state State) {
+	if d.callback != nil {
+		d.callback(layer, index, state)
+	}
+}
+
+func (d *ExpanderKeyboard) Get() []State {
+	for cIdx, c := range d.Col {
+		for rIdx, r := range d.Row {
+			current := false
+			if !d.options.InvertDiode {
+				_ = d.expander.Pin(c).Set(false)
+				current, _ = d.expander.Pin(r).Get()
+			} else {
+				_ = d.expander.Pin(r).Set(false)
+				current, _ = d.expander.Pin(c).Get()
+			}
+			idx := rIdx*len(d.Col) + cIdx
+			switch d.State[idx] {
+			case None:
+				if !current {
+					if d.cycleCounter[idx] >= d.debounce {
+						d.State[idx] = NoneToPress
+						d.cycleCounter[idx] = 0
+					} else {
+						d.cycleCounter[idx]++
+					}
+				} else {
+					d.cycleCounter[idx] = 0
+				}
+			case NoneToPress:
+				d.State[idx] = Press
+			case Press:
+				if !current {
+					d.cycleCounter[idx] = 0
+				} else {
+					if d.cycleCounter[idx] >= d.debounce {
+						d.State[idx] = PressToRelease
+						d.cycleCounter[idx] = 0
+					} else {
+						d.cycleCounter[idx]++
+					}
+				}
+			case PressToRelease:
+				d.State[idx] = None
+			}
+			if !d.options.InvertDiode {
+				_ = d.expander.Pin(c).Set(true)
+			} else {
+				_ = d.expander.Pin(r).Set(true)
+			}
+		}
+	}
+
+	return d.State
+}
+
+func (d *ExpanderKeyboard) Key(layer, index int) Keycode {
+	if layer >= LayerCount {
+		return 0
+	}
+	if index >= len(d.Keys[layer]) {
+		return 0
+	}
+	return d.Keys[layer][index]
+}
+
+func (d *ExpanderKeyboard) SetKeycode(layer, index int, key Keycode) {
+	if layer >= LayerCount {
+		return
+	}
+	if index >= len(d.Keys[layer]) {
+		return
+	}
+	d.Keys[layer][index] = key
+}
+
+func (d *ExpanderKeyboard) GetKeyCount() int {
+	return len(d.State)
+}
+
+func (d *ExpanderKeyboard) Init() error {
+	return nil
+}