From e9b1f05f3a789dc12a0e7734bc314d0212b9b5ef Mon Sep 17 00:00:00 2001
From: sat0ken <15720506+sat0ken@users.noreply.github.com>
Date: Sun, 24 Nov 2024 20:39:11 +0900
Subject: [PATCH] Add support for gopher-badge i2c type (#11)

---
 Makefile                      |   1 +
 README.md                     |   2 +
 hardware/gopher-board-i2c.go  | 126 ++++++++++++++++++++++++++++++++++
 targets/gopher-board-i2c.json |   7 ++
 4 files changed, 136 insertions(+)
 create mode 100644 hardware/gopher-board-i2c.go
 create mode 100644 targets/gopher-board-i2c.json

diff --git a/Makefile b/Makefile
index 96ad382..bf7ed13 100644
--- a/Makefile
+++ b/Makefile
@@ -8,5 +8,6 @@ smoketest: FORCE
 	tinygo build -o ./out/all.pybadge.uf2            --size short --target pybadge                  ./games/all/
 	tinygo build -o ./out/all.wioterminal.uf2        --size short --target wioterminal              ./games/all/
 	tinygo build -o ./out/all.macropad-rp2040.uf2    --size short --target macropad-rp2040          ./games/all/
+	tinygo build -o ./out/all.gopher-board-i2c.uf2   --size short --target ./targets/gopher-board-i2c.json ./games/all/
 
 FORCE:
diff --git a/README.md b/README.md
index 6b8b967..780c359 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,8 @@ The currently supported hardware is as follows.
     * https://www.seeedstudio.com/Wio-Terminal-p-4509.html
 * macropad-rp2040
     * https://learn.adafruit.com/adafruit-macropad-rp2040
+* gopher-board
+  * https://github.com/sat0ken/gopher-board/tree/main/rp2040/v2
 
 ## Add new hardware
 
diff --git a/hardware/gopher-board-i2c.go b/hardware/gopher-board-i2c.go
new file mode 100644
index 0000000..ba07b2f
--- /dev/null
+++ b/hardware/gopher-board-i2c.go
@@ -0,0 +1,126 @@
+//go:build tinygo && gopher_board_i2c
+
+package hardware
+
+import (
+	"machine"
+
+	"github.com/sago35/koebiten"
+	"tinygo.org/x/drivers/ssd1306"
+)
+
+var (
+	Device   = &device{}
+	Display  *ssd1306.Device
+	gpioPins []machine.Pin
+)
+
+type device struct {
+	gpioPins []machine.Pin
+	state    []State
+	cycle    []int
+}
+
+const (
+	debounce = 0
+)
+
+type State uint8
+
+const (
+	None State = iota
+	NoneToPress
+	Press
+	PressToRelease
+)
+
+func (z *device) GetDisplay() koebiten.Displayer {
+	return Display
+}
+
+func (z *device) Init() error {
+	i2c := machine.I2C0
+	i2c.Configure(machine.I2CConfig{
+		Frequency: 2_800_000,
+		SDA:       machine.GPIO0,
+		SCL:       machine.GPIO1,
+	})
+
+	d := ssd1306.NewI2C(i2c)
+	d.Configure(ssd1306.Config{
+		Address: 0x3C,
+		Width:   128,
+		Height:  64,
+	})
+	d.ClearDisplay()
+	Display = &d
+
+	gpioPins = []machine.Pin{
+		machine.GPIO4,  // up
+		machine.GPIO5,  // left
+		machine.GPIO6,  // down
+		machine.GPIO7,  // right
+		machine.GPIO27, // A
+		machine.GPIO28, // B
+	}
+
+	for _, p := range gpioPins {
+		p.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+	}
+
+	z.gpioPins = []machine.Pin{
+		machine.GPIO27,
+		machine.GPIO28,
+		machine.GPIO5,
+		machine.GPIO7,
+		machine.GPIO4,
+		machine.GPIO6,
+	}
+
+	z.state = make([]State, len(z.gpioPins))
+	z.cycle = make([]int, len(z.gpioPins))
+	return nil
+}
+
+func (z *device) KeyUpdate() error {
+	for r := range z.gpioPins {
+		current := !z.gpioPins[r].Get()
+		if z.gpioPins[r] == machine.NoPin {
+			current = false
+		}
+		idx := r
+
+		switch z.state[idx] {
+		case None:
+			if current {
+				if z.cycle[idx] >= debounce {
+					z.state[idx] = NoneToPress
+					z.cycle[idx] = 0
+				} else {
+					z.cycle[idx]++
+				}
+			} else {
+				z.cycle[idx] = 0
+			}
+		case NoneToPress:
+			z.state[idx] = Press
+			koebiten.AppendJustPressedKeys([]koebiten.Key{koebiten.Key(idx)})
+		case Press:
+			koebiten.AppendPressedKeys([]koebiten.Key{koebiten.Key(idx)})
+			if current {
+				z.cycle[idx] = 0
+			} else {
+				if z.cycle[idx] >= debounce {
+					z.state[idx] = PressToRelease
+					z.cycle[idx] = 0
+				} else {
+					z.cycle[idx]++
+				}
+			}
+		case PressToRelease:
+			z.state[idx] = None
+			koebiten.AppendJustReleasedKeys([]koebiten.Key{koebiten.Key(idx)})
+		}
+	}
+	return nil
+}
diff --git a/targets/gopher-board-i2c.json b/targets/gopher-board-i2c.json
new file mode 100644
index 0000000..b397ca9
--- /dev/null
+++ b/targets/gopher-board-i2c.json
@@ -0,0 +1,7 @@
+{
+    "inherits": [
+        "waveshare-rp2040-zero"
+    ],
+    "build-tags": ["gopher_board_i2c"]
+}
+