[Keyboard] Seigaiha (#12791)

Co-authored-by: Ryan <fauxpark@gmail.com>

13 files changed, 535 insertions, 1 deletions

diff --git a/keyboards/barleycorn/readme.md b/keyboards/barleycorn/readme.md
index 775d259681..dd96c69e9a 100644
--- a/keyboards/barleycorn/readme.md
+++ b/keyboards/barleycorn/readme.md
@@ -5,7 +5,7 @@
 An f-row less compact 1800 kit with only through hole components.
 
 * Keyboard Maintainer: [Yiancar](http://yiancar-designs.com/) and on [GitHub](https://github.com/yiancar)
-* Hardware Supported: ATMEGA328p with vusb [PCB](https://github.com/yiancar/gingham_pcb)
+* Hardware Supported: ATMEGA328p with vusb [PCB](https://github.com/yiancar/barleycorn_pcb)
 * Hardware Availability: https://mykeyboard.eu/, https://novelkeys.xyz
 
 Make example for this keyboard (after setting up your build environment):
diff --git a/keyboards/seigaiha/config.h b/keyboards/seigaiha/config.h
new file mode 100644
index 0000000000..5e87bd6f83
--- /dev/null
+++ b/keyboards/seigaiha/config.h
@@ -0,0 +1,105 @@
+/*
+Copyright 2021 Yiancar-Designs
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include "config_common.h"
+
+#define VENDOR_ID       0x8968
+#define PRODUCT_ID      0x4750
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    Yiancar-Designs
+#define PRODUCT         Seigaiha
+
+/* key matrix size */
+#define MATRIX_ROWS 5
+#define MATRIX_COLS 15
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+
+/* A Custom matrix.c is used to poll the port expander D5 shows that the pins are hardwired there */
+#define MATRIX_ROW_PINS { C0, B4, B3, B2, B5 }
+#define MATRIX_COL_PINS { B0, D7, D6, D4, B1, C1, C2, D1, C3, D0, D5, D5, D5, D5, D5 }
+#define UNUSED_PINS
+#define PORT_EXPANDER_ADDRESS 0x20
+
+/* COL2ROW, ROW2COL*/
+#define DIODE_DIRECTION COL2ROW
+
+#define USB_MAX_POWER_CONSUMPTION 100
+
+#define BOOTMAGIC_LITE_ROW 1
+#define BOOTMAGIC_LITE_COLUMN 0
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+/* If defined, GRAVE_ESC will always act as ESC when CTRL is held.
+ * This is userful for the Windows task manager shortcut (ctrl+shift+esc).
+ */
+// #define GRAVE_ESC_CTRL_OVERRIDE
+
+/*
+ * Force NKRO
+ *
+ * Force NKRO (nKey Rollover) to be enabled by default, regardless of the saved
+ * state in the bootmagic EEPROM settings. (Note that NKRO must be enabled in the
+ * makefile for this to work.)
+ *
+ * If forced on, NKRO can be disabled via magic key (default = LShift+RShift+N)
+ * until the next keyboard reset.
+ *
+ * NKRO may prevent your keystrokes from being detected in the BIOS, but it is
+ * fully operational during normal computer usage.
+ *
+ * For a less heavy-handed approach, enable NKRO via magic key (LShift+RShift+N)
+ * or via bootmagic (hold SPACE+N while plugging in the keyboard). Once set by
+ * bootmagic, NKRO mode will always be enabled until it is toggled again during a
+ * power-up.
+ *
+ */
+//#define FORCE_NKRO
+
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+//#define NO_ACTION_MACRO
+//#define NO_ACTION_FUNCTION
diff --git a/keyboards/seigaiha/info.json b/keyboards/seigaiha/info.json
new file mode 100644
index 0000000000..bd313313e0
--- /dev/null
+++ b/keyboards/seigaiha/info.json
@@ -0,0 +1,83 @@
+{
+    "keyboard_name": "Seigaiha",
+    "url": "www.yiancar-designs.com",
+    "maintainer": "Yiancar-Designs",
+    "width": 18.25,
+    "height": 5,
+    "layouts": {
+        "LAYOUT_alice_split_bs": {
+            "layout": [
+                {"x":0, "y":0},
+                {"x":1.25, "y":0},
+                {"x":2.25, "y":0},
+                {"x":3.25, "y":0},
+                {"x":4.25, "y":0},
+                {"x":5.25, "y":0},
+                {"x":6.25, "y":0},
+                {"x":7.25, "y":0},
+                {"x":10.25, "y":0},
+                {"x":11.25, "y":0},
+                {"x":12.25, "y":0},
+                {"x":13.25, "y":0},
+                {"x":14.25, "y":0},
+                {"x":15.25, "y":0},
+                {"x":16.25, "y":0},
+                {"x":17.25, "y":0},
+
+                {"x":0, "y":1},
+                {"x":1.25, "y":1, "w":1.5},
+                {"x":2.75, "y":1},
+                {"x":3.75, "y":1},
+                {"x":4.75, "y":1},
+                {"x":5.75, "y":1},
+                {"x":6.75, "y":1},
+                {"x":9.75, "y":1},
+                {"x":10.75, "y":1},
+                {"x":11.75, "y":1},
+                {"x":12.75, "y":1},
+                {"x":13.75, "y":1},
+                {"x":14.75, "y":1},
+                {"x":15.75, "y":1},
+                {"x":16.75, "y":1, "w":1.5},
+
+                {"x":0, "y":2},
+                {"x":1.25, "y":2, "w":1.75},
+                {"x":3, "y":2},
+                {"x":4, "y":2},
+                {"x":5, "y":2},
+                {"x":6, "y":2},
+                {"x":7, "y":2},
+                {"x":10, "y":2},
+                {"x":11, "y":2},
+                {"x":12, "y":2},
+                {"x":13, "y":2},
+                {"x":14, "y":2},
+                {"x":15, "y":2},
+                {"x":16, "y":2, "w":2.25},
+
+                {"x":1.25, "y":3, "w":2.25},
+                {"x":3.5, "y":3},
+                {"x":4.5, "y":3},
+                {"x":5.5, "y":3},
+                {"x":6.5, "y":3},
+                {"x":7.5, "y":3},
+                {"x":9.5, "y":3},
+                {"x":10.5, "y":3},
+                {"x":11.5, "y":3},
+                {"x":12.5, "y":3},
+                {"x":13.5, "y":3},
+                {"x":14.5, "y":3},
+                {"x":15.5, "y":3, "w":1.75},
+                {"x":17.25, "y":3},
+
+                {"x":1.25, "y":4, "w":1.5},
+                {"x":4.25, "y":4, "w":1.5},
+                {"x":5.75, "y":4, "w":2},
+                {"x":7.75, "y":4, "w":1.25},
+                {"x":9.5, "y":4, "w":2.75},
+                {"x":12.25, "y":4, "w":1.5},
+                {"x":16.75, "y":4, "w":1.5}
+            ]
+        }
+    }
+}
diff --git a/keyboards/seigaiha/keymaps/default/keymap.c b/keyboards/seigaiha/keymaps/default/keymap.c
new file mode 100644
index 0000000000..607d85a132
--- /dev/null
+++ b/keyboards/seigaiha/keymaps/default/keymap.c
@@ -0,0 +1,32 @@
+/* Copyright 2021 Yiancar-Designs
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+[0] = LAYOUT_alice_split_bs( /* Base */
+    KC_ESC,  KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,             KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_DEL,  KC_BSPC,
+    KC_PGUP, KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,                      KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS,
+    KC_PGDN, KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,                      KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,          KC_ENT,
+             KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,                      KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT, MO(1),
+             KC_LCTL,          KC_LALT,          KC_SPC,  KC_LGUI,                   KC_SPC,           KC_RALT,                            KC_RCTL),
+
+[1] = LAYOUT_alice_split_bs( /* FN */
+    KC_TRNS, KC_TRNS, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,          KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_TRNS, KC_TRNS,
+    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_PAUS, KC_UP,   KC_TRNS, KC_TRNS,
+    KC_TRNS, KC_TRNS, KC_VOLD, KC_VOLU, KC_MUTE, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_HOME, KC_LEFT, KC_RGHT,          KC_TRNS,
+             KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_END,  KC_DOWN, KC_TRNS, KC_TRNS,
+             KC_TRNS,          KC_TRNS,          KC_TRNS, KC_TRNS,                 KC_TRNS,          KC_TRNS,                            KC_TRNS)
+};
diff --git a/keyboards/seigaiha/keymaps/default/readme.md b/keyboards/seigaiha/keymaps/default/readme.md
new file mode 100644
index 0000000000..dceb6080e4
--- /dev/null
+++ b/keyboards/seigaiha/keymaps/default/readme.md
@@ -0,0 +1,5 @@
+# The default keymap for Seigaiha with VIA disabled
+
+![Layer 0](https://i.imgur.com/wO8lfpih.png)
+
+![Layer 1](https://i.imgur.com/4Q0Rk2Vh.png)
diff --git a/keyboards/seigaiha/keymaps/via/keymap.c b/keyboards/seigaiha/keymaps/via/keymap.c
new file mode 100644
index 0000000000..00f1b01501
--- /dev/null
+++ b/keyboards/seigaiha/keymaps/via/keymap.c
@@ -0,0 +1,48 @@
+/* Copyright 2021 Yiancar-Designs
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include QMK_KEYBOARD_H
+
+// This keymaps is used for VIA, it reflects the default keymap.
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+[0] = LAYOUT_alice_split_bs( /* Base */
+    KC_ESC,  KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,             KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_DEL,  KC_BSPC,
+    KC_PGUP, KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,                      KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS,
+    KC_PGDN, KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,                      KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,          KC_ENT,
+             KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,                      KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT, MO(1),
+             KC_LCTL,          KC_LALT,          KC_SPC,  KC_LGUI,                   KC_SPC,           KC_RALT,                            KC_RCTL),
+
+[1] = LAYOUT_alice_split_bs( /* FN */
+    KC_TRNS, KC_TRNS, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,          KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_TRNS, KC_TRNS,
+    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_PAUS, KC_UP,   KC_TRNS, KC_TRNS,
+    KC_TRNS, KC_TRNS, KC_VOLD, KC_VOLU, KC_MUTE, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_HOME, KC_LEFT, KC_RGHT,          KC_TRNS,
+             KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_END,  KC_DOWN, KC_TRNS, KC_TRNS,
+             KC_TRNS,          KC_TRNS,          KC_TRNS, KC_TRNS,                 KC_TRNS,          KC_TRNS,                            KC_TRNS),
+
+[2] = LAYOUT_alice_split_bs( /* Empty for dynamic keymaps */
+    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,          KC_TRNS,
+             KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+             KC_TRNS,          KC_TRNS,          KC_TRNS, KC_TRNS,                 KC_TRNS,          KC_TRNS,                            KC_TRNS),
+
+[3] = LAYOUT_alice_split_bs( /* Empty for dynamic keymaps */
+    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+    KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,          KC_TRNS,
+             KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,                 KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
+             KC_TRNS,          KC_TRNS,          KC_TRNS, KC_TRNS,                 KC_TRNS,          KC_TRNS,                            KC_TRNS)
+};
diff --git a/keyboards/seigaiha/keymaps/via/readme.md b/keyboards/seigaiha/keymaps/via/readme.md
new file mode 100644
index 0000000000..8f626d49e3
--- /dev/null
+++ b/keyboards/seigaiha/keymaps/via/readme.md
@@ -0,0 +1,5 @@
+# The default keymap for Seigaiha with VIA enabled
+
+![Layer 0](https://i.imgur.com/wO8lfpih.png)
+
+![Layer 1](https://i.imgur.com/4Q0Rk2Vh.png)
diff --git a/keyboards/seigaiha/keymaps/via/rules.mk b/keyboards/seigaiha/keymaps/via/rules.mk
new file mode 100644
index 0000000000..1e5b99807c
--- /dev/null
+++ b/keyboards/seigaiha/keymaps/via/rules.mk
@@ -0,0 +1 @@
+VIA_ENABLE = yes
diff --git a/keyboards/seigaiha/matrix.c b/keyboards/seigaiha/matrix.c
new file mode 100644
index 0000000000..212b8015f0
--- /dev/null
+++ b/keyboards/seigaiha/matrix.c
@@ -0,0 +1,123 @@
+/*
+Copyright 2012-2020 Jun Wako, Jack Humbert, Yiancar-Designs
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdint.h>
+#include <stdbool.h>
+#include "wait.h"
+#include "quantum.h"
+#include "i2c_master.h"
+
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+
+static void unselect_rows(void) {
+    for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
+        setPinInputHigh(row_pins[x]);
+    }
+}
+
+static void select_row(uint8_t row) {
+    setPinOutput(row_pins[row]);
+    writePinLow(row_pins[row]);
+}
+
+static void unselect_row(uint8_t row) {
+    setPinInputHigh(row_pins[row]);
+}
+
+static void init_pins(void) {
+    unselect_rows();
+    // Set I/O
+    uint8_t send_data = 0x1F;
+    i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x00, &send_data, 1, 20);
+    // Set Pull-up
+    i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x06, &send_data, 1, 20);
+
+    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+        if ( x < 10 ) {
+            setPinInputHigh(col_pins[x]);
+        }
+    }
+}
+
+void matrix_init_custom(void) {
+    // TODO: initialize hardware here
+    // Initialize I2C
+    i2c_init();
+
+    // initialize key pins
+    init_pins();
+    wait_ms(50);
+}
+
+static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
+    // Store last value of row prior to reading
+    matrix_row_t last_row_value = current_matrix[current_row];
+
+    // Clear data in matrix row
+    current_matrix[current_row] = 0;
+
+    // Select row and wait for row selecton to stabilize
+    select_row(current_row);
+    matrix_io_delay();
+
+    uint8_t port_expander_col_buffer;
+    i2c_readReg((PORT_EXPANDER_ADDRESS << 1), 0x09, &port_expander_col_buffer, 1, 20);
+
+    // For each col...
+    for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
+        uint8_t pin_state;
+        // Select the col pin to read (active low)
+        switch (col_index) {
+            case 10 :
+                pin_state = port_expander_col_buffer & (1 << 0);
+                break;
+            case 11 :
+                pin_state = port_expander_col_buffer & (1 << 1);
+                break;
+            case 12 :
+                pin_state = port_expander_col_buffer & (1 << 2);
+                break;
+            case 13 :
+                pin_state = port_expander_col_buffer & (1 << 3);
+                break;
+            case 14 :
+                pin_state = port_expander_col_buffer & (1 << 4);
+                break;
+            default :
+                pin_state = readPin(col_pins[col_index]);
+        }
+
+        // Populate the matrix row with the state of the col pin
+        current_matrix[current_row] |=  pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
+    }
+
+    // Unselect row
+    unselect_row(current_row);
+
+    return (last_row_value != current_matrix[current_row]);
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool matrix_has_changed = false;
+
+    // Set row, read cols
+    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+        matrix_has_changed |= read_cols_on_row(current_matrix, current_row);
+    }
+
+    return matrix_has_changed;
+}
diff --git a/keyboards/seigaiha/readme.md b/keyboards/seigaiha/readme.md
new file mode 100644
index 0000000000..fb0e8571ae
--- /dev/null
+++ b/keyboards/seigaiha/readme.md
@@ -0,0 +1,23 @@
+# Seigaiha
+
+![Seigaiha](https://i.imgur.com/GCGyOmph.jpg)
+
+An alice layout kit with only through hole components.
+
+* Keyboard Maintainer: [Yiancar](http://yiancar-designs.com/) and on [GitHub](https://github.com/yiancar)
+* Hardware Supported: ATMEGA328p with vusb [PCB](https://github.com/yiancar/seigaiha_pcb)
+* Hardware Availability: https://mykeyboard.eu/, https://novelkeys.xyz
+
+Make example for this keyboard (after setting up your build environment):
+
+    make seigaiha:default
+
+Flashing example for this keyboard:
+
+    make seigaiha:default:flash
+
+Bootloader:
+use usbasploader from HSGW's repository.
+https://github.com/hsgw/USBaspLoader/tree/plaid
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/seigaiha/rules.mk b/keyboards/seigaiha/rules.mk
new file mode 100644
index 0000000000..f19a8ec12e
--- /dev/null
+++ b/keyboards/seigaiha/rules.mk
@@ -0,0 +1,29 @@
+# MCU name
+MCU = atmega328p
+
+# Bootloader selection
+BOOTLOADER = USBasp
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = lite     # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output
+
+CUSTOM_MATRIX = lite
+
+LAYOUTS = alice_split_bs
+
+SRC += matrix.c
+QUANTUM_LIB_SRC += i2c_master.c
diff --git a/keyboards/seigaiha/seigaiha.c b/keyboards/seigaiha/seigaiha.c
new file mode 100644
index 0000000000..911034eb56
--- /dev/null
+++ b/keyboards/seigaiha/seigaiha.c
@@ -0,0 +1,45 @@
+/* Copyright 2021 Yiancar-Designs
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "seigaiha.h"
+#include "i2c_master.h"
+
+// There is no need to initialize the I/O it is done in matrix.c
+
+uint8_t send_data = 0x00;
+
+bool led_update_kb(led_t led_state) {
+    bool res = led_update_user(led_state);
+    if(res) {
+        if (led_state.caps_lock){
+            send_data |= 1 << 5;
+        } else {
+            send_data &= ~(1 << 5);
+        }
+        i2c_writeReg((PORT_EXPANDER_ADDRESS << 1), 0x0A, &send_data, 1, 20);
+    }
+    return res;
+}
+
+__attribute__((weak)) layer_state_t layer_state_set_user(layer_state_t state) {
+    if (IS_LAYER_ON_STATE(state, 1)) {
+        send_data |= 1 << 6;
+    }
+    if (IS_LAYER_OFF_STATE(state, 1)) {
+        send_data &= ~(1 << 6);
+    }
+    // Data is send to the port expander during led_update_kb as it runs continuously.
+  return state;
+}
diff --git a/keyboards/seigaiha/seigaiha.h b/keyboards/seigaiha/seigaiha.h
new file mode 100644
index 0000000000..e05c6f5242
--- /dev/null
+++ b/keyboards/seigaiha/seigaiha.h
@@ -0,0 +1,35 @@
+/* Copyright 2021 Yiancar-Designs
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#define XXX KC_NO
+
+#include "quantum.h"
+
+#define LAYOUT_alice_split_bs( \
+    K10, K00, K01, K02, K03, K04, K05, K06,      K07, K08, K09, K0A, K0B, K0C, K0D, K0E, \
+    K20, K11, K12, K13, K14, K15, K16,      K17, K18, K19, K1A, K1B, K1C, K1D, K1E,      \
+    K30, K21, K22, K23, K24, K25, K26,      K27, K28, K29, K2A, K2B, K2C,      K2E,      \
+         K31, K32, K33, K34, K35, K36,      K37, K38, K39, K3A, K3B, K3C, K3D, K3E,      \
+         K41,      K43,      K45, K46,           K48,      K4A,                K4E       \
+) { \
+    { K00, K01, K02, K03, K04, K05, K06, K07, K08, K09, K0A, K0B, K0C, K0D, K0E }, \
+    { K10, K11, K12, K13, K14, K15, K16, K17, K18, K19, K1A, K1B, K1C, K1D, K1E }, \
+    { K20, K21, K22, K23, K24, K25, K26, K27, K28, K29, K2A, K2B, K2C, XXX, K2E }, \
+    { K30, K31, K32, K33, K34, K35, K36, K37, K38, K39, K3A, K3B, K3C, K3D, K3E }, \
+    { XXX, K41, XXX, K43, XXX, K45, K46, XXX, K48, XXX, K4A, XXX, XXX, XXX, K4E }  \
+}