[Keyboard] add 3w6 (#13746)

22 files changed, 1456 insertions, 0 deletions

diff --git a/keyboards/3w6/info.json b/keyboards/3w6/info.json
new file mode 100644
index 0000000000..5a0e9be2f4
--- /dev/null
+++ b/keyboards/3w6/info.json
@@ -0,0 +1,56 @@
+{
+    "keyboard_name": "3w6",
+    "url": "https://github.com/weteor/3W6/",
+    "maintainer": "weteor",
+    "width": 13,
+    "height": 5,
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"label": "k00", "x": 0, "y": 0.8},
+                {"label": "k01", "x": 1, "y": 0.2},
+                {"label": "k02", "x": 2, "y": 0},
+                {"label": "k03", "x": 3, "y": 0.2},
+                {"label": "k04", "x": 4, "y": 0.4},
+
+                {"label": "k05", "x": 8, "y": 0.4},
+                {"label": "k06", "x": 9, "y": 0.2},
+                {"label": "k07", "x": 10, "y": 0},
+                {"label": "k08", "x": 11, "y": 0.2},
+                {"label": "k09", "x": 12, "y": 0.8},
+
+                {"label": "k10", "x": 0, "y": 1.8},
+                {"label": "k11", "x": 1, "y": 1.2},
+                {"label": "k12", "x": 2, "y": 1},
+                {"label": "k13", "x": 3, "y": 1.2},
+                {"label": "k14", "x": 4, "y": 1.4},
+
+                {"label": "k15", "x": 8, "y": 1.4},
+                {"label": "k16", "x": 9, "y": 1.2},
+                {"label": "k17", "x": 10, "y": 1},
+                {"label": "k18", "x": 11, "y": 1.2},
+                {"label": "k19", "x": 12, "y": 1.8},
+
+                {"label": "k20", "x": 0, "y": 2.8},
+                {"label": "k21", "x": 1, "y": 2.2},
+                {"label": "k22", "x": 2, "y": 2},
+                {"label": "k23", "x": 3, "y": 2.2},
+                {"label": "k24", "x": 4, "y": 2.4},
+
+                {"label": "k25", "x": 8, "y": 2.4},
+                {"label": "k26", "x": 9, "y": 2.2},
+                {"label": "k27", "x": 10, "y": 2},
+                {"label": "k28", "x": 11, "y": 2.2},
+                {"label": "k29", "x": 12, "y": 2.8},
+
+                {"label": "k32", "x": 3.2, "y": 3.6},
+                {"label": "k33", "x": 4.2, "y": 3.6},
+                {"label": "k34", "x": 5.2, "y": 3.8},
+
+                {"label": "k35", "x": 6.8, "y": 3.8},
+                {"label": "k36", "x": 7.8, "y": 3.6},
+                {"label": "k37", "x": 8.8, "y": 3.6}
+            ]
+        }
+    }
+}
diff --git a/keyboards/3w6/keymaps/default/keymap.c b/keyboards/3w6/keymaps/default/keymap.c
new file mode 100644
index 0000000000..029173b674
--- /dev/null
+++ b/keyboards/3w6/keymaps/default/keymap.c
@@ -0,0 +1,69 @@
+/* Copyright 2021 weteor
+ *
+ * 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
+
+enum layers
+{
+    _ALPHA_QWERTY = 0,
+    _ALPHA_COLEMAK,
+    _SYM,
+    _NAV,
+    _NUM,
+    _CFG,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+    
+    [_ALPHA_QWERTY] = LAYOUT(
+        KC_Q,         KC_W,    KC_E,    KC_R,    KC_T,                                                KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,  
+        KC_A,         KC_S,    KC_D,    KC_F,    KC_G,                                                KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN,
+        LSFT_T(KC_Z), KC_X,    KC_C,    KC_V,    KC_B,                                                KC_N,    KC_M,    KC_COMM, KC_DOT,  RSFT_T(KC_SLSH),
+            
+                        LCTL_T(KC_ESC), LT(_NUM,KC_SPC), LT(_NAV, KC_TAB),     LT(_SYM, KC_BSPC), KC_ENT, LALT_T(KC_DEL)         
+    ),
+    [_ALPHA_COLEMAK] = LAYOUT(
+        KC_Q,         KC_W,    KC_F,    KC_P,    KC_G,                                                KC_J,    KC_L,    KC_U,    KC_Y,    KC_QUOT,
+        KC_A,         KC_R,    KC_S,    KC_T,    KC_D,                                                KC_H,    KC_N,    KC_E,    KC_I,    KC_O,
+        LSFT_T(KC_Z), KC_X,    KC_C,    KC_V,    KC_B,                                                KC_K,    KC_M,    KC_COMM, KC_DOT,  RSFT_T(KC_SCLN),
+                        LCTL_T(KC_ENT), LT(_NUM,KC_SPC), LT(_NAV, KC_TAB),     LT(_SYM, KC_BSPC), KC_ENT, LALT_T(KC_DEL)         
+    ),
+    [_SYM] = LAYOUT(
+        KC_GRV , KC_CIRC,   KC_AT,  KC_DLR, KC_TILD,                                KC_AMPR, KC_EXLM, KC_PIPE, KC_UNDS, KC_HASH,
+        KC_SLSH, KC_LBRC, KC_LCBR, KC_LPRN,  KC_EQL,                                KC_ASTR, KC_RPRN, KC_RCBR, KC_RBRC, KC_BSLS, 
+        _______, KC_QUES, KC_PLUS, KC_PERC, XXXXXXX,                                XXXXXXX, XXXXXXX, KC_MINS, XXXXXXX, _______,
+                                        XXXXXXX, MO(_CFG), XXXXXXX,     XXXXXXX, XXXXXXX, XXXXXXX         
+    ),
+    [_NAV] = LAYOUT(
+        XXXXXXX, KC_VOLD, KC_MUTE, KC_VOLU, XXXXXXX,                                XXXXXXX, KC_PGDN,   KC_UP, KC_PGUP,  KC_DEL,
+        KC_MPRV, KC_MPLY, KC_MSTP, KC_MNXT, XXXXXXX,                                KC_HOME, KC_LEFT, KC_DOWN, KC_RGHT,  KC_END,
+        XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                                XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
+                                        XXXXXXX, XXXXXXX, XXXXXXX,      XXXXXXX, MO(_CFG), XXXXXXX         
+    ),
+    [_NUM] = LAYOUT(
+        XXXXXXX,  KC_F9, KC_F10, KC_F11, KC_F12,                                    KC_PPLS,  KC_P7,  KC_P8,  KC_P9, KC_PSLS,
+        XXXXXXX,  KC_F5,  KC_F6,  KC_F7,  KC_F8,                                    KC_P0,  KC_P4,  KC_P5,  KC_P6, KC_PDOT,
+        XXXXXXX,  KC_F1,  KC_F2,  KC_F3,  KC_F4,                                    KC_PMNS,  KC_P1,  KC_P2,  KC_P3, KC_PAST,
+                                        XXXXXXX, XXXXXXX, XXXXXXX,      KC_PEQL, KC_PENT, XXXXXXX
+    ),
+    [_CFG] = LAYOUT(
+        XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                                XXXXXXX, XXXXXXX, XXXXXXX,DF(_ALPHA_QWERTY), DF(_ALPHA_COLEMAK),
+        XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                                XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
+        XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,                                XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
+                                         XXXXXXX, XXXXXXX, XXXXXXX,     XXXXXXX, XXXXXXX, XXXXXXX
+    ),
+};
diff --git a/keyboards/3w6/keymaps/manna-harbour_miryoku/config.h b/keyboards/3w6/keymaps/manna-harbour_miryoku/config.h
new file mode 100644
index 0000000000..fb567ad7d3
--- /dev/null
+++ b/keyboards/3w6/keymaps/manna-harbour_miryoku/config.h
@@ -0,0 +1,32 @@
+/* Copyright 2021 weteor
+ *
+ * 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/>.
+ */
+
+// generated from users/manna-harbour_miryoku/miryoku.org  -*- buffer-read-only: t -*-
+
+#pragma once
+
+#define LAYOUT_miryoku( \
+       K00,   K01,   K02,   K03,   K04,   K05,   K06,   K07,   K08,   K09, \
+       K10,   K11,   K12,   K13,   K14,   K15,   K16,   K17,   K18,   K19, \
+       K20,   K21,   K22,   K23,   K24,   K25,   K26,   K27,   K28,   K29, \
+       N30,   N31,   K32,   K33,   K34,   K35,   K36,   K37,   N38,   N39 \
+) \
+LAYOUT( \
+K00,   K01,   K02,   K03,   K04,   K05,   K06,   K07,   K08,   K09, \
+K10,   K11,   K12,   K13,   K14,   K15,   K16,   K17,   K18,   K19, \
+K20,   K21,   K22,   K23,   K24,   K25,   K26,   K27,   K28,   K29, \
+                     K32,   K33,   K34,   K35,   K36,   K37 \
+)
diff --git a/keyboards/3w6/keymaps/manna-harbour_miryoku/keymap.c b/keyboards/3w6/keymaps/manna-harbour_miryoku/keymap.c
new file mode 100644
index 0000000000..74df5e0fe1
--- /dev/null
+++ b/keyboards/3w6/keymaps/manna-harbour_miryoku/keymap.c
@@ -0,0 +1,17 @@
+/* Copyright 2021 weteor
+ *
+ * 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/>.
+ */
+
+// generated from users/manna-harbour_miryoku/miryoku.org  -*- buffer-read-only: t -*-
diff --git a/keyboards/3w6/readme.md b/keyboards/3w6/readme.md
new file mode 100644
index 0000000000..5878376bde
--- /dev/null
+++ b/keyboards/3w6/readme.md
@@ -0,0 +1,45 @@
+# 3W6
+
+![3W6](https://raw.githubusercontent.com/weteor/3W6/main/images/3w6_rev2_1s.jpg)
+
+The 3w6 is a low profile, split ortholinear keyboard with 36 keys.
+
+I needed a keyboard for work and wasn't really satisfied with the available alternatives (namely Corne, Kyria and Ferris), mostly because they are either rather large and/or don't have the spacing I would like.
+
+The 3w6 is designed to be a simple, realiable, cheap and small keyboard to be taken everywhere. 
+
+There are currently two revisions:
+* Rev1: 
+  - onboard microcontroller (ATMega32U4)
+  - USB-C connector Board <-> PC
+  - USB-C connectors between both split halfs
+  - choc spacing (18x17mm)
+  - aggressive pinky stagger
+  - support for Choc V1 switches
+* Rev2:
+  - everything Rev1 did
+  - additional middle plate (2mm)
+  - support for [Pimoroni Trackball](https://shop.pimoroni.com/products/trackball-breakout) instead of outer thumb switch on right half, needs midplate
+  - mounting holes for [Tenting Puck](https://splitkb.com/collections/keyboard-parts/products/tenting-puck), only usable without mid or switchplate
+
+---
+
+* Keyboard Maintainer: [weteor](https://github.com/weteor)
+* Hardware Supported: 
+    * 3w6 rev1
+    * 3w6 rev2 (with Pimoroni support)
+* Hardware Availability: 
+    * make one yourself: [Design and Productionfiles](https://github.com/weteor/3w6)
+    * maintainer is selling kits when available
+---
+To reach the bootloader, connect the board to the PC and push the reset button on left half.
+
+Make examples for this keyboard (after setting up your build environment):
+
+    make 3w6/rev1:default
+    make 3w6/rev2:default
+    make 3w6/rev2:default_pimoroni
+   
+ ---
+
+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/3w6/rev1/config.h b/keyboards/3w6/rev1/config.h
new file mode 100644
index 0000000000..1f0bab97fa
--- /dev/null
+++ b/keyboards/3w6/rev1/config.h
@@ -0,0 +1,63 @@
+/*
+Copyright 2021 weteor
+
+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
+
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID    0xFEED
+#define PRODUCT_ID   0x4658
+#define DEVICE_VER   0x0001
+#define MANUFACTURER weteor
+#define PRODUCT      3w6
+
+/* key matrix size */
+#define MATRIX_ROWS 8
+#define MATRIX_COLS 10
+
+#define MATRIX_ROWS_PER_SIDE (MATRIX_ROWS / 2)
+#define MATRIX_COLS_PER_SIDE (MATRIX_COLS / 2)
+
+/*
+ * 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)
+ *
+ */
+#define MATRIX_ROW_PINS_L { B0, B1, B2, B4}
+#define MATRIX_COL_PINS_L { B3, E6, F7, B6, B5 }
+#define UNUSED_PINS_L { B7, C6, C7, D2, D3, D4, D5, D6, D7, F0, F1, F4, F5, F6 }
+
+#define MATRIX_ROW_PINS_R { P10, P11, P12, P05 }
+#define MATRIX_COL_PINS_R { P06, P13, P14, P01, P00 }
+#define UNUSED_PINS_R { P02, P03, P04, P07, P15, P16, P17 }
+
+
+/* COL2ROW, ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* disable these deprecated features by default */
+#define NO_ACTION_MACRO
+#define NO_ACTION_FUNCTION
+
diff --git a/keyboards/3w6/rev1/matrix.c b/keyboards/3w6/rev1/matrix.c
new file mode 100644
index 0000000000..7262fd22e6
--- /dev/null
+++ b/keyboards/3w6/rev1/matrix.c
@@ -0,0 +1,280 @@
+/*
+Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
+          2020 Pierre Chevalier <pierrechevalier83@gmail.com>
+          2021 weteor
+
+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/>.
+*/
+
+/*
+ * This code was heavily inspired by the ergodox_ez keymap, and modernized
+ * to take advantage of the quantum.h microcontroller agnostics gpio control
+ * abstractions and use the macros defined in config.h for the wiring as opposed
+ * to repeating that information all over the place.
+ */
+
+#include QMK_KEYBOARD_H
+#include "i2c_master.h"
+
+extern i2c_status_t tca9555_status;
+#define I2C_TIMEOUT 1000
+
+// I2C address:
+// All address pins of the tca9555 are connected to the ground
+// | 0  | 1  | 0  | 0  | A2 | A1 | A0 |
+// | 0  | 1  | 0  | 0  | 0  | 0  | 0  |
+#define I2C_ADDR 0b0100000
+#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)
+#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)
+
+// Register addresses
+#define IODIRA 0x06  // i/o direction register
+#define IODIRB 0x07
+#define IREGP0 0x00  // GPIO pull-up resistor register
+#define IREGP1 0x01
+#define OREGP0 0x02  // general purpose i/o port register (write modifies OLAT)
+#define OREGP1 0x03
+
+bool         i2c_initialized = 0;
+i2c_status_t tca9555_status = I2C_ADDR;
+
+uint8_t init_tca9555(void) {
+    print("starting init");
+    tca9555_status = I2C_ADDR;
+
+    // I2C subsystem
+    if (i2c_initialized == 0) {
+        i2c_init();  // on pins D(1,0)
+        i2c_initialized = true;
+        wait_ms(I2C_TIMEOUT);
+    }
+
+    // set pin direction
+    // - unused  : input  : 1
+    // - input   : input  : 1
+    // - driving : output : 0
+    tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+    if (tca9555_status) goto out;
+    tca9555_status = i2c_write(IODIRA, I2C_TIMEOUT);
+    if (tca9555_status) goto out;
+    // This means: write on pin 5 of port 0, read on rest
+    tca9555_status = i2c_write(0b11011111, I2C_TIMEOUT);
+    if (tca9555_status) goto out;
+    // This means: we will write on pins 0 to 2 on port 1. read rest
+    tca9555_status = i2c_write(0b11111000, I2C_TIMEOUT);
+    if (tca9555_status) goto out;
+
+out:
+    i2c_stop();
+    return tca9555_status;
+}
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];      // debounced values
+
+static matrix_row_t read_cols(uint8_t row);
+static void         init_cols(void);
+static void         unselect_rows(void);
+static void         select_row(uint8_t row);
+
+static uint8_t tca9555_reset_loop;
+
+void matrix_init_custom(void) {
+    // initialize row and col
+
+    tca9555_status = init_tca9555();
+
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        matrix[i]     = 0;
+    }
+}
+
+void matrix_power_up(void) {
+    tca9555_status = init_tca9555();
+
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        matrix[i] = 0;
+    }
+}
+
+// Reads and stores a row, returning
+// whether a change occurred.
+static inline bool store_matrix_row(matrix_row_t current_matrix[], uint8_t index) {
+    matrix_row_t temp = read_cols(index);
+    if (current_matrix[index] != temp) {
+        current_matrix[index] = temp;
+        return true;
+    }
+    return false;
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    if (tca9555_status) {  // if there was an error
+        if (++tca9555_reset_loop == 0) {
+            // since tca9555_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
+            // this will be approx bit more frequent than once per second
+            dprint("trying to reset tca9555\n");
+            tca9555_status = init_tca9555();
+            if (tca9555_status) {
+                dprint("right side not responding\n");
+            } else {
+                dprint("right side attached\n");
+            }
+        }
+    }
+
+    bool changed = false;
+    for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
+        // select rows from left and right hands
+        uint8_t left_index  = i;
+        uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
+        select_row(left_index);
+        select_row(right_index);
+
+        // we don't need a 30us delay anymore, because selecting a
+        // left-hand row requires more than 30us for i2c.
+
+        changed |= store_matrix_row(current_matrix, left_index);
+        changed |= store_matrix_row(current_matrix, right_index);
+
+        unselect_rows();
+    }
+
+    return changed;
+}
+
+static void init_cols(void) {
+    // init on tca9555
+    // not needed, already done as part of init_tca9555()
+
+    // init on mcu
+    pin_t matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_L;
+    for (int pin_index = 0; pin_index < MATRIX_COLS_PER_SIDE; pin_index++) {
+        pin_t pin = matrix_col_pins_mcu[pin_index];
+        setPinInput(pin);
+        writePinHigh(pin);
+    }
+}
+
+static matrix_row_t read_cols(uint8_t row) {
+    if (row < MATRIX_ROWS_PER_SIDE) {
+        pin_t        matrix_col_pins_mcu[MATRIX_COLS_PER_SIDE] = MATRIX_COL_PINS_L;
+        matrix_row_t current_row_value                         = 0;
+        // For each col...
+        for (uint8_t col_index = 0; col_index < MATRIX_COLS_PER_SIDE; col_index++) {
+            // Select the col pin to read (active low)
+            uint8_t pin_state = readPin(matrix_col_pins_mcu[col_index]);
+
+            // Populate the matrix row with the state of the col pin
+            current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
+        }
+        return current_row_value;
+    } else {
+        if (tca9555_status) {  // if there was an error
+            return 0;
+        } else {
+            uint8_t data    = 0;
+            uint8_t port0   = 0;
+            uint8_t port1   = 0;
+            tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+            if (tca9555_status) goto out;
+            tca9555_status = i2c_write(IREGP0, I2C_TIMEOUT);
+            if (tca9555_status) goto out;
+            tca9555_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
+            if (tca9555_status) goto out;
+            tca9555_status = i2c_read_ack(I2C_TIMEOUT);
+            if (tca9555_status < 0) goto out;
+            port0 = (uint8_t)tca9555_status;
+            tca9555_status = i2c_read_nack(I2C_TIMEOUT);
+            if (tca9555_status < 0) goto out;
+            port1 = (uint8_t)tca9555_status;
+
+            // The initial state was all ones and any depressed key at a given column for the currently selected row will have its bit flipped to zero.
+            // The return value is a row as represented in the generic matrix code were the rightmost bits represent the lower columns and zeroes represent non-depressed keys while ones represent depressed keys.
+            // Since the pins are not ordered sequentially, we have to build the correct dataset from the two ports. Refer to the schematic to see where every pin is connected.
+            data |= ( port0 & 0x01 ); 
+            data |= ( port0 & 0x02 ); 
+            data |= ( port1 & 0x10 ) >> 2; 
+            data |= ( port1 & 0x08 ); 
+            data |= ( port0 & 0x40 ) >> 2; 
+            data = ~(data);
+
+            tca9555_status = I2C_STATUS_SUCCESS;
+        out:
+            i2c_stop();
+            return data;
+        }
+    }
+}
+
+static void unselect_rows(void) {
+    // no need to unselect on tca9555, because the select step sets all
+    // the other row bits high, and it's not changing to a different
+    // direction
+
+    // unselect rows on microcontroller
+    pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_L;
+    for (int pin_index = 0; pin_index < MATRIX_ROWS_PER_SIDE; pin_index++) {
+        pin_t pin = matrix_row_pins_mcu[pin_index];
+        setPinInput(pin);
+        writePinLow(pin);
+    }
+}
+
+static void select_row(uint8_t row) {
+    uint8_t port0 = 0xff;
+    uint8_t port1 = 0xff;
+
+    if (row < MATRIX_ROWS_PER_SIDE) {
+        // select on atmega32u4
+        pin_t matrix_row_pins_mcu[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS_L;
+        pin_t pin                                       = matrix_row_pins_mcu[row];
+        setPinOutput(pin);
+        writePinLow(pin);
+    } else {
+        // select on tca9555
+        if (tca9555_status) {  // if there was an error
+                                // do nothing
+        } else {
+            switch(row) {
+                case 4: port1 &= ~(1 << 0); break;
+                case 5: port1 &= ~(1 << 1); break;
+                case 6: port1 &= ~(1 << 2); break;
+                case 7: port0 &= ~(1 << 5); break;
+                default:                    break;
+            }
+
+            tca9555_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+            if (tca9555_status) goto out;
+            tca9555_status = i2c_write(OREGP0, I2C_TIMEOUT);
+            if (tca9555_status) goto out;
+            tca9555_status = i2c_write(port0, I2C_TIMEOUT);
+            if (tca9555_status) goto out;
+            tca9555_status = i2c_write(port1, I2C_TIMEOUT);
+            if (tca9555_status) goto out;
+            // Select the desired row by writing a byte for the entire GPIOB bus where only the bit representing the row we want to select is a zero (write instruction) and every other bit is a one.
+            // Note that the row - MATRIX_ROWS_PER_SIDE reflects the fact that being on the right hand, the columns are numbered from MATRIX_ROWS_PER_SIDE to MATRIX_ROWS, but the pins we want to write to are indexed from zero up on the GPIOB bus.
+        out:
+            i2c_stop();
+        }
+    }
+}
diff --git a/keyboards/3w6/rev1/readme.md b/keyboards/3w6/rev1/readme.md
new file mode 100644
index 0000000000..4d806f9222
--- /dev/null
+++ b/keyboards/3w6/rev1/readme.md
@@ -0,0 +1,32 @@
+# 3W6
+
+![3W6](https://raw.githubusercontent.com/weteor/3W6/main/images/3w6_1s.jpg)
+![3W6](https://raw.githubusercontent.com/weteor/3W6/main/images/3w6_3s.jpg)
+
+The 3w6 is a low profile, split ortholinear keyboard with 36 keys.
+
+* Rev1: 
+  - onboard microcontroller (ATMega32U4)
+  - USB-C connector Board <-> PC
+  - USB-C connectors between both split halfs
+  - choc spacing (18x17mm)
+  - aggressive pinky stagger
+  - support for Choc V1 switches
+
+---
+
+* Keyboard Maintainer: [weteor](https://github.com/weteor)
+* Hardware Supported: 
+    * 3w6 rev1
+* Hardware Availability (this is an older version, current revision is rev2): 
+    * make one yourself: [Design and Productionfiles](https://github.com/weteor/3w6)
+---
+To reach the bootloader, connect the board to the PC and push the reset button on left half.
+
+Make examples for this keyboard (after setting up your build environment):
+
+    make 3w6/rev1:default
+   
+ ---
+
+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/3w6/rev1/rev1.c b/keyboards/3w6/rev1/rev1.c
new file mode 100644
index 0000000000..3944ec3b13
--- /dev/null
+++ b/keyboards/3w6/rev1/rev1.c
@@ -0,0 +1,17 @@
+/* Copyright 2021 weteor
+ *
+ * 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 "rev1.h"
diff --git a/keyboards/3w6/rev1/rev1.h b/keyboards/3w6/rev1/rev1.h
new file mode 100644
index 0000000000..ba881ca431
--- /dev/null
+++ b/keyboards/3w6/rev1/rev1.h
@@ -0,0 +1,44 @@
+/* Copyright 2021 weteor
+ *
+ * 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 "quantum.h"
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define LAYOUT( \
+      k00, k01, k02, k03, k04,             k05, k06, k07, k08, k09,\
+      k10, k11, k12, k13, k14,             k15, k16, k17, k18, k19,\
+      k20, k21, k22, k23, k24,             k25, k26, k27, k28, k29,\
+                   k32, k33, k34,       k35, k36, k37\
+) { \
+    {   k00,   k01,   k02,   k03,   k04 }, \
+    {   k10,   k11,   k12,   k13,   k14 }, \
+    {   k20,   k21,   k22,   k23,   k24 }, \
+    { KC_NO, KC_NO,   k32,   k33,   k34 }, \
+    \
+    {   k05,   k06,   k07,   k08,   k09 }, \
+    {   k15,   k16,   k17,   k18,   k19 }, \
+    {   k25,   k26,   k27,   k28,   k29 }, \
+    {   k35,   k36,   k37, KC_NO, KC_NO }, \
+}
diff --git a/keyboards/3w6/rev1/rules.mk b/keyboards/3w6/rev1/rules.mk
new file mode 100644
index 0000000000..d4876dde77
--- /dev/null
+++ b/keyboards/3w6/rev1/rules.mk
@@ -0,0 +1,29 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no     # 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
+UNICODE_ENABLE = yes
+CUSTOM_MATRIX = lite
+NO_USB_STARTUP_CHECK = yes
+LTO_ENABLE = no
+
+SRC += matrix.c
+QUANTUM_LIB_SRC += i2c_master.c
diff --git a/keyboards/3w6/rev2/config.h b/keyboards/3w6/rev2/config.h
new file mode 100644
index 0000000000..d191360607
--- /dev/null
+++ b/keyboards/3w6/rev2/config.h
@@ -0,0 +1,63 @@
+/*
+Copyright 2021 weteor
+
+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
+
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID    0xFEED
+#define PRODUCT_ID   0x4658
+#define DEVICE_VER   0x0002
+#define MANUFACTURER weteor
+#define PRODUCT      3w6
+
+/* key matrix size */
+#define MATRIX_ROWS 8
+#define MATRIX_COLS 10
+
+#define MATRIX_ROWS_PER_SIDE (MATRIX_ROWS / 2)
+#define MATRIX_COLS_PER_SIDE (MATRIX_COLS / 2)
+
+/*
+ * 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)
+ *
+ */
+#define MATRIX_ROW_PINS_L { B0, B1, B2, B4}
+#define MATRIX_COL_PINS_L { B3, E6, F7, B6, B5 }
+#define UNUSED_PINS_L { B7, C6, C7, D2, D3, D4, D5, D6, D7, F0, F1, F4, F5, F6 }
+
+#define MATRIX_ROW_PINS_R { P10, P11, P12, P05 }
+#define MATRIX_COL_PINS_R { P06, P13, P14, P01, P00 }
+#define UNUSED_PINS_R {