[Keyboard] Add keyboard GRS-70EC (#11296)

10 files changed, 716 insertions, 0 deletions

diff --git a/keyboards/sekigon/grs_70ec/config.h b/keyboards/sekigon/grs_70ec/config.h
new file mode 100644
index 0000000000..aa740e7775
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/config.h
@@ -0,0 +1,154 @@
+/*
+Copyright 2020 sekigon-gonnoc
+
+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"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID    0xFEED
+#define PRODUCT_ID   0x70EC
+#define DEVICE_VER   0x0001
+#define MANUFACTURER sekigon-gonnoc
+#define PRODUCT      GRS-70EC
+
+/* key matrix size */
+#define MATRIX_ROWS 10
+#define MATRIX_COLS 8
+
+/* EC switch threshold with hysteresis */
+#define HIGH_THRESHOLD 300
+#define LOW_THRESHOLD 200
+
+/*
+ * 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 { C6, D7, E6, B4, B5 }
+#define MATRIX_COL_PINS { S2, S1, S0, S3, S5, S7, S6, S4 }
+#define UNUSED_PINS
+#define DISCHARGE_PIN B1
+#define ANALOG_PORT F6
+#define MUX_SEL_PINS { D1, D0, D4 }
+
+/* COL2ROW, ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/*
+ * Split Keyboard specific options, make sure you have 'SPLIT_KEYBOARD = yes' in your rules.mk, and define SOFT_SERIAL_PIN.
+ */
+#define SOFT_SERIAL_PIN D3  // or D1, D2, D3, E6
+#define EE_HANDS
+
+//#define BACKLIGHT_PIN B7
+//#define BACKLIGHT_LEVELS 3
+//#define BACKLIGHT_BREATHING
+
+//#define RGB_DI_PIN E2
+//#ifdef RGB_DI_PIN
+//#    define RGBLED_NUM 16
+//#    define RGBLIGHT_HUE_STEP 8
+//#    define RGBLIGHT_SAT_STEP 8
+//#    define RGBLIGHT_VAL_STEP 8
+//#    define RGBLIGHT_LIMIT_VAL 255 /* The maximum brightness level */
+//#    define RGBLIGHT_SLEEP  /* If defined, the RGB lighting will be switched off when the host goes to sleep */
+/*== all animations enable ==*/
+//#    define RGBLIGHT_ANIMATIONS
+/*== or choose animations ==*/
+//#    define RGBLIGHT_EFFECT_BREATHING
+//#    define RGBLIGHT_EFFECT_RAINBOW_MOOD
+//#    define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+//#    define RGBLIGHT_EFFECT_SNAKE
+//#    define RGBLIGHT_EFFECT_KNIGHT
+//#    define RGBLIGHT_EFFECT_CHRISTMAS
+//#    define RGBLIGHT_EFFECT_STATIC_GRADIENT
+//#    define RGBLIGHT_EFFECT_RGB_TEST
+//#    define RGBLIGHT_EFFECT_ALTERNATING
+/*== customize breathing effect ==*/
+/*==== (DEFAULT) use fixed table instead of exp() and sin() ====*/
+//#    define RGBLIGHT_BREATHE_TABLE_SIZE 256      // 256(default) or 128 or 64
+/*==== use exp() and sin() ====*/
+//#    define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85  // 1 to 2.7
+//#    define RGBLIGHT_EFFECT_BREATHE_MAX    255   // 0 to 255
+//#endif
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* define if matrix has ghost (lacks anti-ghosting diodes) */
+//#define MATRIX_HAS_GHOST
+
+/* 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 useful 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
+
+/* disable these deprecated features by default */
+#define NO_ACTION_MACRO
+#define NO_ACTION_FUNCTION
+
+/* Bootmagic Lite key configuration */
+//#define BOOTMAGIC_LITE_ROW 0
+//#define BOOTMAGIC_LITE_COLUMN 0
diff --git a/keyboards/sekigon/grs_70ec/ec_switch_matrix.c b/keyboards/sekigon/grs_70ec/ec_switch_matrix.c
new file mode 100644
index 0000000000..88e9bdabdb
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/ec_switch_matrix.c
@@ -0,0 +1,161 @@
+/* Copyright 2020 sekigon-gonnoc
+ *
+ * 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 "ec_switch_matrix.h"
+
+#include "quantum.h"
+#include "analog.h"
+#include "print.h"
+
+// sensing channel definitions
+#define S0 0
+#define S1 1
+#define S2 2
+#define S3 3
+#define S4 4
+#define S5 5
+#define S6 6
+#define S7 7
+
+// pin connections
+const uint8_t row_pins[]     = MATRIX_ROW_PINS;
+const uint8_t col_channels[] = MATRIX_COL_PINS;
+const uint8_t mux_sel_pins[] = MUX_SEL_PINS;
+
+_Static_assert(sizeof(mux_sel_pins) == 3, "invalid MUX_SEL_PINS");
+
+static ecsm_config_t config;
+static uint16_t      ecsm_sw_value[MATRIX_ROWS][MATRIX_COLS];
+
+static inline void discharge_capacitor(void) { setPinOutput(DISCHARGE_PIN); }
+static inline void charge_capacitor(uint8_t row) {
+    setPinInput(DISCHARGE_PIN);
+    writePinHigh(row_pins[row]);
+}
+
+static inline void clear_all_row_pins(void) {
+    for (int row = 0; row < sizeof(row_pins); row++) {
+        writePinLow(row_pins[row]);
+    }
+}
+
+static inline void init_mux_sel(void) {
+    for (int idx = 0; idx < sizeof(mux_sel_pins); idx++) {
+        setPinOutput(mux_sel_pins[idx]);
+    }
+}
+
+static inline void select_mux(uint8_t col) {
+    uint8_t ch = col_channels[col];
+    writePin(mux_sel_pins[0], ch & 1);
+    writePin(mux_sel_pins[1], ch & 2);
+    writePin(mux_sel_pins[2], ch & 4);
+}
+
+static inline void init_row(void) {
+    for (int idx = 0; idx < sizeof(row_pins); idx++) {
+        setPinOutput(row_pins[idx]);
+        writePinLow(row_pins[idx]);
+    }
+}
+
+// Initialize pins
+int ecsm_init(ecsm_config_t const* const ecsm_config) {
+    // save config
+    config = *ecsm_config;
+
+    // initialize discharge pin as discharge mode
+    writePinLow(DISCHARGE_PIN);
+    setPinOutput(DISCHARGE_PIN);
+
+    // set analog reference
+    analogReference(ADC_REF_POWER);
+
+    // initialize drive lines
+    init_row();
+
+    // initialize multiplexer select pin
+    init_mux_sel();
+
+    // set discharge pin to charge mode
+    setPinInput(DISCHARGE_PIN);
+
+    return 0;
+}
+
+// Read key value of key (row, col)
+uint16_t ecsm_readkey_raw(uint8_t row, uint8_t col) {
+    uint16_t sw_value = 0;
+
+    discharge_capacitor();
+
+    select_mux(col);
+
+    clear_all_row_pins();
+
+    cli();
+
+    charge_capacitor(row);
+
+    sw_value = analogReadPin(ANALOG_PORT);
+
+    sei();
+
+    return sw_value;
+}
+
+// Update press/release state of key at (row, col)
+bool ecsm_update_key(matrix_row_t* current_row, uint8_t col, uint16_t sw_value) {
+    bool current_state = (*current_row >> col) & 1;
+
+    // press to release
+    if (current_state && sw_value < config.low_threshold) {
+        *current_row &= ~(1 << col);
+        return true;
+    }
+
+    // release to press
+    if ((!current_state) && sw_value > config.high_threshold) {
+        *current_row |= (1 << col);
+        return true;
+    }
+
+    return false;
+}
+
+// Scan key values and update matrix state
+bool ecsm_matrix_scan(matrix_row_t current_matrix[]) {
+    bool updated = false;
+
+    for (int col = 0; col < sizeof(col_channels); col++) {
+        for (int row = 0; row < sizeof(row_pins); row++) {
+            ecsm_sw_value[row][col] = ecsm_readkey_raw(row, col);
+            updated |= ecsm_update_key(&current_matrix[row], col, ecsm_sw_value[row][col]);
+        }
+    }
+
+    return updated;
+}
+
+// Print key values
+void ecsm_print_matrix(void) {
+    for (int row = 0; row < sizeof(row_pins); row++) {
+        for (int col = 0; col < sizeof(col_channels); col++) {
+            xprintf("%4d", ecsm_sw_value[row][col]);
+        }
+        xprintf("\n");
+    }
+}
diff --git a/keyboards/sekigon/grs_70ec/ec_switch_matrix.h b/keyboards/sekigon/grs_70ec/ec_switch_matrix.h
new file mode 100644
index 0000000000..c690fe8e27
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/ec_switch_matrix.h
@@ -0,0 +1,38 @@
+/* Copyright 2020 sekigon-gonnoc
+ *
+ * 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/>.
+ */
+
+//
+// Scan EC switch matrix using 74HC7051
+// Define MUX_SEL_PINS, DISCHARGE_PIN, and ANALOG_PORT to compile
+//
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "matrix.h"
+
+typedef struct {
+    uint16_t low_threshold;   // threshold for key release
+    uint16_t high_threshold;  // threshold for key press
+} ecsm_config_t;
+
+int      ecsm_init(ecsm_config_t const* const ecsm_config);
+bool     ecsm_matrix_scan(matrix_row_t current_matrix[]);
+void     ecsm_print_matrix(void);
+uint16_t ecsm_readkey_raw(uint8_t row, uint8_t col);
+bool     ecsm_update_key(matrix_row_t* current_row, uint8_t col, uint16_t sw_value);
diff --git a/keyboards/sekigon/grs_70ec/grs_70ec.c b/keyboards/sekigon/grs_70ec/grs_70ec.c
new file mode 100644
index 0000000000..e8791c00c1
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/grs_70ec.c
@@ -0,0 +1,38 @@
+/* Copyright 2020 sekigon-gonnoc
+ *
+ * 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 "grs_70ec.h"
+
+void led_on(void) {
+    setPinOutput(D2);
+    writePinHigh(D2);
+}
+
+void led_off(void) { writePinLow(D2); }
+
+void keyboard_post_init_kb() {
+    led_on();
+
+    keyboard_post_init_user();
+}
+
+void keyboard_pre_init_kb(void) {
+    // Turn on extern circuit
+    setPinOutput(F7);
+    writePinHigh(F7);
+
+    keyboard_pre_init_user();
+}
diff --git a/keyboards/sekigon/grs_70ec/grs_70ec.h b/keyboards/sekigon/grs_70ec/grs_70ec.h
new file mode 100644
index 0000000000..7b2b0c596c
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/grs_70ec.h
@@ -0,0 +1,49 @@
+/* Copyright 2020 sekigon-gonnoc
+ *
+ * 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"
+
+void led_on(void);
+void led_off(void);
+
+/* 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( \
+    L00, L01, L02, L03, L04, L05, L06, R00, R01, R02, R03, R04, R05, R06, R07, \
+         L11, L12, L13, L14, L15, L16, R10, R11, R12, R13, R14, R15, R16, R17, \
+         L21, L22, L23, L24, L25, L26, R20, R21, R22, R23, R24, R25, R26, R27, \
+    L30, L31, L32, L33, L34, L35, L36, R30, R31, R32, R33, R34, R35, R36, R37, \
+    L40,      L42, L43,      L45, L46, R40, R41, R42, R43,      R45, R46, R47  \
+) { \
+    { L00, L01, L02, L03, L04, L05, L06, KC_NO }, \
+    { KC_NO, L11, L12, L13, L14, L15, L16, KC_NO }, \
+    { KC_NO, L21, L22, L23, L24, L25, L26, KC_NO }, \
+    { L30, L31, L32, L33, L34, L35, L36, KC_NO }, \
+    { L40, KC_NO, L42, L43, KC_NO, L45, L46, KC_NO }, \
+    { R00, R01, R02, R03, R04, R05, R06, R07 }, \
+    { R10, R11, R12, R13, R14, R15, R16, R17 }, \
+    { R20, R21, R22, R23, R24, R25, R26, R27 }, \
+    { R30, R31, R32, R33, R34, R35, R36, R37 }, \
+    { R40, R41, R42, R43, KC_NO, R45, R46, R47 } \
+}
diff --git a/keyboards/sekigon/grs_70ec/info.json b/keyboards/sekigon/grs_70ec/info.json
new file mode 100644
index 0000000000..0affe821ae
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/info.json
@@ -0,0 +1,83 @@
+{
+    "keyboard_name": "grs_70ec",
+    "url": "https://github.com/sekigon-gonnoc/GRS-70EC-doc/",
+    "maintainer": "sekigon-gonnoc",
+    "width": 15.75,
+    "height": 5,
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                { "label": "k00", "x": 0, "y": 0 },
+                { "label": "k01", "x": 1, "y": 0 },
+                { "label": "k02", "x": 2, "y": 0 },
+                { "label": "k03", "x": 3, "y": 0 },
+                { "label": "k04", "x": 4, "y": 0 },
+                { "label": "k05", "x": 5, "y": 0 },
+                { "label": "k06", "x": 6, "y": 0 },
+                { "label": "k50", "x": 7.75, "y": 0 },
+                { "label": "k51", "x": 8.75, "y": 0 },
+                { "label": "k52", "x": 9.75, "y": 0 },
+                { "label": "k53", "x": 10.75, "y": 0 },
+                { "label": "k54", "x": 11.75, "y": 0 },
+                { "label": "k55", "x": 12.75, "y": 0 },
+                { "label": "k56", "x": 13.75, "y": 0 },
+                { "label": "k57", "x": 14.75, "y": 0 },
+                { "label": "k11", "x": 0, "y": 1, "w": 1.5 },
+                { "label": "k12", "x": 1.5, "y": 1 },
+                { "label": "k13", "x": 2.5, "y": 1 },
+                { "label": "k14", "x": 3.5, "y": 1 },
+                { "label": "k15", "x": 4.5, "y": 1 },
+                { "label": "k16", "x": 5.5, "y": 1 },
+                { "label": "k60", "x": 7.25, "y": 1 },
+                { "label": "k61", "x": 8.25, "y": 1 },
+                { "label": "k62", "x": 9.25, "y": 1 },
+                { "label": "k63", "x": 10.25, "y": 1 },
+                { "label": "k64", "x": 11.25, "y": 1 },
+                { "label": "k65", "x": 12.25, "y": 1 },
+                { "label": "k66", "x": 13.25, "y": 1 },
+                { "label": "k67", "x": 14.25, "y": 1, "w": 1.5 },
+                { "label": "k21", "x": 0, "y": 2, "w": 1.75 },
+                { "label": "k22", "x": 1.75, "y": 2 },
+                { "label": "k23", "x": 2.75, "y": 2 },
+                { "label": "k24", "x": 3.75, "y": 2 },
+                { "label": "k25", "x": 4.75, "y": 2 },
+                { "label": "k26", "x": 5.75, "y": 2 },
+                { "label": "k70", "x": 7.5, "y": 2 },
+                { "label": "k71", "x": 8.5, "y": 2 },
+                { "label": "k72", "x": 9.5, "y": 2 },
+                { "label": "k73", "x": 10.5, "y": 2 },
+                { "label": "k74", "x": 11.5, "y": 2 },
+                { "label": "k75", "x": 12.5, "y": 2 },
+                { "label": "k76", "x": 13.5, "y": 2 },
+                { "label": "k77", "x": 14.5, "y": 2 },
+                { "label": "k30", "x": 0, "y": 3 },
+                { "label": "k31", "x": 1, "y": 3 },
+                { "label": "k32", "x": 2, "y": 3 },
+                { "label": "k33", "x": 3, "y": 3 },
+                { "label": "k34", "x": 4, "y": 3 },
+                { "label": "k35", "x": 5, "y": 3 },
+                { "label": "k36", "x": 6, "y": 3 },
+                { "label": "k80", "x": 7.75, "y": 3 },
+                { "label": "k81", "x": 8.75, "y": 3 },
+                { "label": "k82", "x": 9.75, "y": 3 },
+                { "label": "k83", "x": 10.75, "y": 3 },
+                { "label": "k84", "x": 11.75, "y": 3 },
+                { "label": "k85", "x": 12.75, "y": 3 },
+                { "label": "k86", "x": 13.75, "y": 3 },
+                { "label": "k87", "x": 14.75, "y": 3 },
+                { "label": "k40", "x": 0, "y": 4, "w": 1.25 },
+                { "label": "k42", "x": 2, "y": 4 },
+                { "label": "k43", "x": 3, "y": 4, "w": 1.25 },
+                { "label": "k45", "x": 4.25, "y": 4, "w": 1.25 },
+                { "label": "k46", "x": 5.5, "y": 4, "w": 1.25 },
+                { "label": "k90", "x": 7.5, "y": 4, "w": 1.25 },
+                { "label": "k91", "x": 8.75, "y": 4, "w": 1.25 },
+                { "label": "k92", "x": 10, "y": 4, "w": 1.25 },
+                { "label": "k93", "x": 11.25, "y": 4 },
+                { "label": "k95", "x": 12.75, "y": 4 },
+                { "label": "k96", "x": 13.75, "y": 4 },
+                { "label": "k97", "x": 14.75, "y": 4 }
+            ]
+        }
+    }
+}
diff --git a/keyboards/sekigon/grs_70ec/keymaps/default/keymap.c b/keyboards/sekigon/grs_70ec/keymaps/default/keymap.c
new file mode 100644
index 0000000000..bbb0fe4a2c
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/keymaps/default/keymap.c
@@ -0,0 +1,41 @@
+/* Copyright 2020 sekigon-gonnoc
+ *
+ * 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(
+             KC_ESC,  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_BSPC, KC_BSPC,
+             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_LCTL, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,     KC_J,    KC_K,    KC_L,   KC_SCLN, KC_QUOT, KC_ENT,  LALT(KC_GRV),
+    KC_LSFT, KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,     KC_M,    KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_UP,   KC_RSFT,
+             KC_LCTL, KC_LGUI, KC_LALT, KC_SPC,  LT(1,KC_SPC),  LT(2,KC_ENT),  KC_ENT,   KC_RGUI, KC_RALT,      KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    [1] = LAYOUT(
+             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_DEL,
+             KC_TAB,  S(KC_1), S(KC_2), S(KC_3), S(KC_4), S(KC_5), S(KC_6),  S(KC_7), S(KC_8), S(KC_9),S(KC_0), KC_LBRC, KC_RBRC, KC_PIPE,
+             KC_LCTL, KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_LCBR,  KC_MINS, KC_EQL,  KC_RCBR,KC_COLN, KC_DQT,  KC_ENT,  KC_ENT,
+    KC_LSFT, KC_LSFT, KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_UNDS,  KC_PLUS, KC_LBRC, KC_RBRC,KC_BSLS, KC_RSFT, KC_UP,   KC_NO,
+             KC_LCTL, KC_LGUI, KC_LALT, KC_SPC,  KC_TRNS, KC_ENT,  KC_ENT,   KC_RGUI, KC_RALT,                  KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    [2] = LAYOUT(
+             KC_TILD, 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_INS,  KC_INS,
+             KC_TAB,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_HOME,  KC_PGDN, KC_PGUP, KC_END, KC_P,    KC_LBRC, KC_RBRC, KC_BSLS,
+             KC_LCTL, KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_LEFT,  KC_DOWN, KC_UP,   KC_RGHT,KC_SCLN, KC_QUOT, KC_ENT,  LALT(KC_GRV),
+    KC_LSFT, KC_LSFT, KC_F11,  KC_F12,  KC_C,    KC_V,    KC_B,    KC_N,     KC_M,    KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_UP,   KC_RSFT,
+             KC_LCTL, KC_LGUI, KC_LALT, KC_SPC,  KC_SPC,  KC_TRNS,  KC_ENT,   KC_RGUI, KC_RALT,                 KC_LEFT, KC_DOWN, KC_RGHT
+    )
+};
+
diff --git a/keyboards/sekigon/grs_70ec/matrix.c b/keyboards/sekigon/grs_70ec/matrix.c
new file mode 100644
index 0000000000..7e90d99af6
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/matrix.c
@@ -0,0 +1,107 @@
+/* Copyright 2020 sekigon-gonnoc
+ *
+ * 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 "grs_70ec.h"
+
+#include "ec_switch_matrix.h"
+#include "matrix.h"
+#include "debug.h"
+#include "split_util.h"
+#include "transport.h"
+#include "debounce.h"
+
+#ifndef LOW_THRESHOLD
+#    define LOW_THRESHOLD 200
+#endif
+
+#ifndef HIGH_THRESHOLD
+#    define HIGH_THRESHOLD 300
+#endif
+
+#define ERROR_DISCONNECT_COUNT 20
+
+#define ROWS_PER_HAND (MATRIX_ROWS / 2)
+
+/* matrix state(1:on, 0:off) */
+extern matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
+extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
+
+// row offsets for each hand
+uint8_t thisHand, thatHand;
+
+// user-defined overridable functions
+__attribute__((weak)) void matrix_slave_scan_user(void) {}
+
+void matrix_init_custom(void) {
+    split_pre_init();
+
+    ecsm_config_t ecsm_config = {.low_threshold = LOW_THRESHOLD, .high_threshold = HIGH_THRESHOLD};
+
+    ecsm_init(&ecsm_config);
+
+    thisHand = isLeftHand ? 0 : (ROWS_PER_HAND);
+    thatHand = ROWS_PER_HAND - thisHand;
+
+    split_post_init();
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool updated = ecsm_matrix_scan(current_matrix);
+
+    static int cnt = 0;
+    if (cnt++ == 300) {
+        cnt = 0;
+        ecsm_print_matrix();
+        print("\n");
+    }
+
+    return updated;
+}
+
+void matrix_post_scan(void) {
+    if (is_keyboard_master()) {
+        static uint8_t error_count;
+
+        if (!transport_master(matrix + thatHand)) {
+            error_count++;
+
+            if (error_count > ERROR_DISCONNECT_COUNT) {
+                // reset other half if disconnected
+                dprintf("Error: disconnect split half\n");
+                for (int i = 0; i < ROWS_PER_HAND; ++i) {
+                    matrix[thatHand + i] = 0;
+                }
+            }
+        } else {
+            error_count = 0;
+        }
+
+        matrix_scan_quantum();
+    } else {
+        transport_slave(matrix + thisHand);
+
+        matrix_slave_scan_user();
+    }
+}
+
+uint8_t matrix_scan(void) {
+    bool changed = matrix_scan_custom(raw_matrix);
+
+    debounce(raw_matrix, matrix + thisHand, ROWS_PER_HAND, changed);
+
+    matrix_post_scan();
+    return changed;
+}
diff --git a/keyboards/sekigon/grs_70ec/readme.md b/keyboards/sekigon/grs_70ec/readme.md
new file mode 100644
index 0000000000..c60e7fdb93
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/readme.md
@@ -0,0 +1,19 @@
+# GRS-70EC
+
+![grs_70ec](https://raw.githubusercontent.com/sekigon-gonnoc/GRS-70EC-doc/master/img/GRS-70EC.JPG)
+
+A split keyboard using electrostatic capacitive switch
+
+* Keyboard Maintainer: [sekigon](https://github.com/sekigon-gonnoc)
+* Hardware Supported: GRS-70EC PCB, Pro Micro
+* Hardware Availability: [BOOTH Shop](https://nogikes.booth.pm/items/2626903)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make sekigon/grs_70ec:default
+
+Flashing example for this keyboard:
+
+    make sekigon/grs_70ec:default:flash
+
+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/sekigon/grs_70ec/rules.mk b/keyboards/sekigon/grs_70ec/rules.mk
new file mode 100644
index 0000000000..410cd92474
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/rules.mk
@@ -0,0 +1,26 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = caterina
+
+# 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 = yes        # 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
+SPLIT_KEYBOARD = yes
+
+SRC += analog.c ec_switch_matrix.c matrix.c