1 files changed, 56 insertions, 0 deletions
diff --git a/keyboards/gboards/gergoplex/gergoplex.h b/keyboards/gboards/gergoplex/gergoplex.h
new file mode 100644
index 0000000000..507072a376
--- /dev/null
+++ b/keyboards/gboards/gergoplex/gergoplex.h
@@ -0,0 +1,56 @@
+/* Copyright 2021 Jane Bernhardt
+  *
+  * 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"
+#include "i2c_master.h"
+
+extern i2c_status_t mcp23018_status;
+#define I2C_TIMEOUT 1000
+#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
+#define CPU_16MHz 0x00
+
+// I2C aliases and register addresses (see "mcp23018.md")
+#define I2C_ADDR 0x20  // 0b0100000
+#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)
+#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)
+#define IODIRA 0x00  // i/o direction register
+#define IODIRB 0x01
+#define GPPUA 0x0C  // GPIO pull-up resistor register
+#define GPIOA 0x12  // general purpose i/o port register (write modifies OLAT)
+#define OLATA 0x14  // output latch register
+
+uint8_t init_mcp23018(void);
+
+#define LAYOUT_split_3x5_3( \
+    L00, L01, L02, L03, L04,        R00, R01, R02, R03, R04, \
+    L10, L11, L12, L13, L14,        R10, R11, R12, R13, R14, \
+    L20, L21, L22, L23, L24,        R20, R21, R22, R23, R24, \
+                L30, L31, L32,    R30, R31, R32 \
+    ) \
+    { \
+        {L04, L14, L24, KC_NO}, \
+        {L03, L13, L23, L32}, \
+        {L02, L12, L22, L31}, \
+        {L01, L11, L21, L30}, \
+        {L00, L10, L20, KC_NO}, \
+        {R00, R10, R20, KC_NO}, \
+        {R01, R11, R21, R30}, \
+        {R02, R12, R22, R31}, \
+        {R03, R13, R23, R32}, \
+        {R04, R14, R24, KC_NO}, \
+    }