From 71e6aa02a7e67f51614624ae7acce07e65e21d42 Mon Sep 17 00:00:00 2001
From: sago35 <sago35@gmail.com>
Date: Wed, 23 Aug 2023 22:06:50 +0900
Subject: [PATCH] Set keycode 0x7C03 to a special keycode for restoring default

---
 keyboard.go          | 8 ++++++++
 keycodes/keycodes.go | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/keyboard.go b/keyboard.go
index 72bde64..679d31e 100644
--- a/keyboard.go
+++ b/keyboard.go
@@ -169,6 +169,9 @@ func (d *Device) Tick() error {
 	for i, x := range d.pressed {
 		if x&keycodes.ModKeyMask == keycodes.ModKeyMask {
 			d.layer = int(x) & 0x0F
+		} else if x == keycodes.KeyRestoreDefaultKeymap {
+			// restore default keymap for QMK
+			machine.Flash.EraseBlocks(0, 1)
 		} else if x&0xF000 == 0xD000 {
 			switch x & 0x00FF {
 			case 0x01, 0x02, 0x04, 0x08, 0x10:
@@ -294,6 +297,9 @@ func (d *Device) KeyVia(layer, kbIndex, index int) Keycode {
 	case 0xFF00, 0xFF01, 0xFF02, 0xFF03, 0xFF04, 0xFF05:
 		// MO(x)
 		kc = 0x5220 | (kc & 0x000F)
+	case keycodes.KeyRestoreDefaultKeymap:
+		// restore default keymap for QMK
+		kc = keycodes.KeyRestoreDefaultKeymap
 	default:
 		kc = kc & 0x0FFF
 	}
@@ -336,6 +342,8 @@ func (d *Device) SetKeycodeVia(layer, kbIndex, index int, key Keycode) {
 	case 0x5220, 0x5221, 0x5222, 0x5223, 0x5224, 0x5225:
 		// MO(x)
 		kc = 0xFF00 | (kc & 0x000F)
+	case keycodes.KeyRestoreDefaultKeymap:
+		kc = keycodes.KeyRestoreDefaultKeymap
 	default:
 	}
 
diff --git a/keycodes/keycodes.go b/keycodes/keycodes.go
index e4ceb26..dc32e26 100644
--- a/keycodes/keycodes.go
+++ b/keycodes/keycodes.go
@@ -15,3 +15,8 @@ const (
 	KeyH         = 0xF000 | 0x0B
 	KeyBackspace = 0xF000 | 0x2A
 )
+
+const (
+	// restore default keymap for QMK
+	KeyRestoreDefaultKeymap = 0x7C03
+)