Keyboard: Rename alt67 to alt (#3824)

Renamed keyboard alt67 to alt and adjusted necessary files where alt67 appeared.
CTRL keymap fixed enum structure name.
usb2422 removed stray define no longer used.

10 files changed, 992 insertions, 0 deletions

diff --git a/keyboards/massdrop/alt/alt.h b/keyboards/massdrop/alt/alt.h
new file mode 100644
index 000000000..387985512
--- /dev/null
+++ b/keyboards/massdrop/alt/alt.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "quantum.h"
+#include "config_led.h"
+#include "matrix.h"
+
+#include "i2c_master.h"
+#include "led_matrix.h" //For led keycodes
+#include "usb/udi_cdc.h"
+#include "usb/usb2422.h"
+
+#define LAYOUT( \
+    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, K30, \
+    K31, K32, K33, K34, K35, K36, K37, K38, K39, K40, K41, K42, K43, K44, K45, \
+    K46, K47, K48, K49, K50, K51, K52, K53, K54, K55, K56, K57, K58, K59, K60, \
+    K61, K62, K63, K64, K65, K66, K67 \
+) { \
+    {   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,   K30, }, \
+    {   K31,   K32,   K33,   K34,   K35,   K36,   K37,   K38,   K39,   K40,   K41,   K42, KC_NO,   K43,   K44, }, \
+    {   K45, KC_NO,   K46,   K47,   K48,   K49,   K50,   K51,   K52,   K53,   K54,   K55,   K56,   K57,   K58, }, \
+    {   K59,   K60,   K61, KC_NO, KC_NO, KC_NO,   K62, KC_NO, KC_NO, KC_NO,   K63,   K64,   K65,   K66,   K67, }, \
+}
diff --git a/keyboards/massdrop/alt/config.h b/keyboards/massdrop/alt/config.h
new file mode 100644
index 000000000..a486f34a0
--- /dev/null
+++ b/keyboards/massdrop/alt/config.h
@@ -0,0 +1,79 @@
+/*
+Copyright 2015 Jun Wako <wakojun@gmail.com>
+
+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           0x04D8
+#define PRODUCT_ID          0xEED3
+#define DEVICE_VER          0x0101
+
+#define MANUFACTURER        "Massdrop Inc."
+#define PRODUCT             "ALT Keyboard"
+#define SERIAL_NUM          "Unavailable"
+
+/* key matrix size */
+#define MATRIX_ROWS 5
+#define MATRIX_COLS 15
+
+#define PA 0
+#define PB 1
+
+#define MATRIX_ROW_PORTS PA, PA, PA, PA, PA
+#define MATRIX_ROW_PINS   0,  1,  2,  3,  4
+
+#define MATRIX_COL_PORTS PB, PB, PB, PB, PB, PB, PB, PB, PB, PB, PA, PA, PA, PA, PA
+#define MATRIX_COL_PINS   4,  5,  6,  7,  8,  9, 10, 11, 12, 13,  5,  6,  7, 10, 11
+
+/* Print boot debug codes using debug LED when M28 and M30 shorted */
+#define DEBUG_BOOT_TRACING
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCING_DELAY 5
+
+/* 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
+
+/* key combination for command */
+#define IS_COMMAND() ( \
+    keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
+)
+
+/* Force boot in NKRO mode */
+//#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/massdrop/alt/config_led.h b/keyboards/massdrop/alt/config_led.h
new file mode 100644
index 000000000..a049e3817
--- /dev/null
+++ b/keyboards/massdrop/alt/config_led.h
@@ -0,0 +1,178 @@
+/*
+Copyright 2018 Massdrop Inc.
+
+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/>.
+*/
+
+#ifndef _config_led_h_
+#define _config_led_h_
+
+//Define number of ISSI3733 drivers being used (1...16)
+#define ISSI3733_DRIVER_COUNT 2
+
+//Hardware address of each driver (Refer to ISSI3733 pdf "Table 1 Slave Address" and keyboard schematic)
+#define ISSI3773_DRIVER_ADDRESSES { 0xA0, 0xBE }
+
+//LED I2C bus speed
+#define I2C_HZ 580000
+
+//Count of LED bodies
+#define ISSI3733_LED_COUNT 105
+
+//Default Global Current Register value (Default brightness 0 - 255)
+#define ISSI3733_GCR_DEFAULT 128
+
+#define LED_GCR_MAX                 165         //Max GCR value (0 - 255) WARNING: Raising this value may overload the LED drivers and USB bus
+#define LED_GCR_STEP                10          //GCR increment/decrement value
+
+//Automatic power rollback and recovery
+#define V5_HIGH                     2540        //5V high level (After low power detect, point at which LEDs are allowed to use more power )
+#define V5_LOW                      2480        //5V low level (LED power rolled back to stay above this limit)
+#define V5_CAT                      2200        //5V catastrophic level (Host USB port potential to shut down)
+
+#define ANIMATION_SPEED_STEP        1
+
+#define BREATHE_MIN_STEP            0
+#define BREATHE_MAX_STEP            255
+
+//LED Mapping - More practically generated from a spreadsheet program
+//id: ID of the LED (Sync with PCB callouts)
+//x: Physical X coordinate of LED (units do not matter)
+//y: Physical Y coordinate of LED (units do not matter)
+//drv: 1-Based index of ISSI3773_DRIVER_ADDRESSES
+//cs: Matrix wiring CS col (1-16)
+//swr: Matrix wiring SW Red row (1-12)
+//swg: Matrix wiring SW Green row (1-12)
+//swb: Matrix wiring SW Blue row (1-12)
+//scan: Associated key scancode if any
+//Note: Origin 0,0 may be located anywhere as the software will do the final layout
+#define ISSI3733_LED_MAP { \
+ { .id = 1, .x = 0, .y = 0, .adr = { .drv = 2, .cs = 2, .swr = 2, .swg = 1, .swb = 3 }, .scan = 0 }, \
+ { .id = 2, .x = 0.75, .y = 0, .adr = { .drv = 2, .cs = 3, .swr = 5, .swg = 4, .swb = 6 }, .scan = 1 }, \
+ { .id = 3, .x = 1.5, .y = 0, .adr = { .drv = 2, .cs = 4, .swr = 5, .swg = 4, .swb = 6 }, .scan = 2 }, \
+ { .id = 4, .x = 2.25, .y = 0, .adr = { .drv = 2, .cs = 5, .swr = 5, .swg = 4, .swb = 6 }, .scan = 3 }, \
+ { .id = 5, .x = 3, .y = 0, .adr = { .drv = 2, .cs = 6, .swr = 5, .swg = 4, .swb = 6 }, .scan = 4 }, \
+ { .id = 6, .x = 3.75, .y = 0, .adr = { .drv = 2, .cs = 7, .swr = 5, .swg = 4, .swb = 6 }, .scan = 5 }, \
+ { .id = 7, .x = 4.5, .y = 0, .adr = { .drv = 2, .cs = 8, .swr = 5, .swg = 4, .swb = 6 }, .scan = 6 }, \
+ { .id = 8, .x = 5.25, .y = 0, .adr = { .drv = 2, .cs = 13, .swr = 2, .swg = 1, .swb = 3 }, .scan = 7 }, \
+ { .id = 9, .x = 6, .y = 0, .adr = { .drv = 1, .cs = 1, .swr = 5, .swg = 4, .swb = 6 }, .scan = 8 }, \
+ { .id = 10, .x = 6.75, .y = 0, .adr = { .drv = 1, .cs = 2, .swr = 5, .swg = 4, .swb = 6 }, .scan = 9 }, \
+ { .id = 11, .x = 7.5, .y = 0, .adr = { .drv = 1, .cs = 3, .swr = 5, .swg = 4, .swb = 6 }, .scan = 10 }, \
+ { .id = 12, .x = 8.25, .y = 0, .adr = { .drv = 1, .cs = 4, .swr = 5, .swg = 4, .swb = 6 }, .scan = 11 }, \
+ { .id = 13, .x = 9, .y = 0, .adr = { .drv = 1, .cs = 5, .swr = 5, .swg = 4, .swb = 6 }, .scan = 12 }, \
+ { .id = 14, .x = 10.125, .y = 0, .adr = { .drv = 1, .cs = 6, .swr = 5, .swg = 4, .swb = 6 }, .scan = 13 }, \
+ { .id = 15, .x = 11.25, .y = 0, .adr = { .drv = 1, .cs = 7, .swr = 2, .swg = 1, .swb = 3 }, .scan = 14 }, \
+ { .id = 16, .x = 0.188, .y = -0.75, .adr = { .drv = 2, .cs = 2, .swr = 5, .swg = 4, .swb = 6 }, .scan = 15 }, \
+ { .id = 17, .x = 1.125, .y = -0.75, .adr = { .drv = 2, .cs = 3, .swr = 8, .swg = 7, .swb = 9 }, .scan = 16 }, \
+ { .id = 18, .x = 1.875, .y = -0.75, .adr = { .drv = 2, .cs = 4, .swr = 8, .swg = 7, .swb = 9 }, .scan = 17 }, \
+ { .id = 19, .x = 2.625, .y = -0.75, .adr = { .drv = 2, .cs = 5, .swr = 8, .swg = 7, .swb = 9 }, .scan = 18 }, \
+ { .id = 20, .x = 3.375, .y = -0.75, .adr = { .drv = 2, .cs = 6, .swr = 8, .swg = 7, .swb = 9 }, .scan = 19 }, \
+ { .id = 21, .x = 4.125, .y = -0.75, .adr = { .drv = 2, .cs = 7, .swr = 8, .swg = 7, .swb = 9 }, .scan = 20 }, \
+ { .id = 22, .x = 4.875, .y = -0.75, .adr = { .drv = 2, .cs = 8, .swr = 8, .swg = 7, .swb = 9 }, .scan = 21 }, \
+ { .id = 23, .x = 5.625, .y = -0.75, .adr = { .drv = 1, .cs = 1, .swr = 8, .swg = 7, .swb = 9 }, .scan = 22 }, \
+ { .id = 24, .x = 6.375, .y = -0.75, .adr = { .drv = 1, .cs = 2, .swr = 8, .swg = 7, .swb = 9 }, .scan = 23 }, \
+ { .id = 25, .x = 7.125, .y = -0.75, .adr = { .drv = 1, .cs = 3, .swr = 8, .swg = 7, .swb = 9 }, .scan = 24 }, \
+ { .id = 26, .x = 7.875, .y = -0.75, .adr = { .drv = 1, .cs = 4, .swr = 8, .swg = 7, .swb = 9 }, .scan = 25 }, \
+ { .id = 27, .x = 8.625, .y = -0.75, .adr = { .drv = 1, .cs = 5, .swr = 8, .swg = 7, .swb = 9 }, .scan = 26 }, \
+ { .id = 28, .x = 9.375, .y = -0.75, .adr = { .drv = 1, .cs = 11, .swr = 11, .swg = 10, .swb = 12 }, .scan = 27 }, \
+ { .id = 29, .x = 10.313, .y = -0.75, .adr = { .drv = 1, .cs = 6, .swr = 8, .swg = 7, .swb = 9 }, .scan = 28 }, \
+ { .id = 30, .x = 11.25, .y = -0.75, .adr = { .drv = 1, .cs = 7, .swr = 5, .swg = 4, .swb = 6 }, .scan = 29 }, \
+ { .id = 31, .x = 0.281, .y = -1.5, .adr = { .drv = 2, .cs = 2, .swr = 8, .swg = 7, .swb = 9 }, .scan = 30 }, \
+ { .id = 32, .x = 1.313, .y = -1.5, .adr = { .drv = 2, .cs = 3, .swr = 11, .swg = 10, .swb = 12 }, .scan = 31 }, \
+ { .id = 33, .x = 2.063, .y = -1.5, .adr = { .drv = 2, .cs = 4, .swr = 11, .swg = 10, .swb = 12 }, .scan = 32 }, \
+ { .id = 34, .x = 2.813, .y = -1.5, .adr = { .drv = 2, .cs = 5, .swr = 11, .swg = 10, .swb = 12 }, .scan = 33 }, \
+ { .id = 35, .x = 3.563, .y = -1.5, .adr = { .drv = 2, .cs = 6, .swr = 11, .swg = 10, .swb = 12 }, .scan = 34 }, \
+ { .id = 36, .x = 4.313, .y = -1.5, .adr = { .drv = 2, .cs = 7, .swr = 11, .swg = 10, .swb = 12 }, .scan = 35 }, \
+ { .id = 37, .x = 5.063, .y = -1.5, .adr = { .drv = 2, .cs = 8, .swr = 11, .swg = 10, .swb = 12 }, .scan = 36 }, \
+ { .id = 38, .x = 5.813, .y = -1.5, .adr = { .drv = 1, .cs = 1, .swr = 11, .swg = 10, .swb = 12 }, .scan = 37 }, \
+ { .id = 39, .x = 6.563, .y = -1.5, .adr = { .drv = 1, .cs = 2, .swr = 11, .swg = 10, .swb = 12 }, .scan = 38 }, \
+ { .id = 40, .x = 7.313, .y = -1.5, .adr = { .drv = 1, .cs = 3, .swr = 11, .swg = 10, .swb = 12 }, .scan = 39 }, \
+ { .id = 41, .x = 8.063, .y = -1.5, .adr = { .drv = 1, .cs = 4, .swr = 11, .swg = 10, .swb = 12 }, .scan = 40 }, \
+ { .id = 42, .x = 8.813, .y = -1.5, .adr = { .drv = 1, .cs = 5, .swr = 11, .swg = 10, .swb = 12 }, .scan = 41 }, \
+ { .id = 43, .x = 10.031, .y = -1.5, .adr = { .drv = 1, .cs = 6, .swr = 11, .swg = 10, .swb = 12 }, .scan = 43 }, \
+ { .id = 44, .x = 11.25, .y = -1.5, .adr = { .drv = 1, .cs = 7, .swr = 8, .swg = 7, .swb = 9 }, .scan = 44 }, \
+ { .id = 45, .x = 0.469, .y = -2.25, .adr = { .drv = 2, .cs = 2, .swr = 11, .swg = 10, .swb = 12 }, .scan = 45 }, \
+ { .id = 46, .x = 1.688, .y = -2.25, .adr = { .drv = 2, .cs = 9, .swr = 5, .swg = 4, .swb = 6 }, .scan = 47 }, \
+ { .id = 47, .x = 2.438, .y = -2.25, .adr = { .drv = 2, .cs = 9, .swr = 2, .swg = 1, .swb = 3 }, .scan = 48 }, \
+ { .id = 48, .x = 3.188, .y = -2.25, .adr = { .drv = 2, .cs = 9, .swr = 11, .swg = 10, .swb = 12 }, .scan = 49 }, \
+ { .id = 49, .x = 3.938, .y = -2.25, .adr = { .drv = 2, .cs = 9, .swr = 8, .swg = 7, .swb = 9 }, .scan = 50 }, \
+ { .id = 50, .x = 4.688, .y = -2.25, .adr = { .drv = 2, .cs = 12, .swr = 11, .swg = 10, .swb = 12 }, .scan = 51 }, \
+ { .id = 51, .x = 5.438, .y = -2.25, .adr = { .drv = 2, .cs = 13, .swr = 11, .swg = 10, .swb = 12 }, .scan = 52 }, \
+ { .id = 52, .x = 6.188, .y = -2.25, .adr = { .drv = 1, .cs = 9, .swr = 11, .swg = 10, .swb = 12 }, .scan = 53 }, \
+ { .id = 53, .x = 6.938, .y = -2.25, .adr = { .drv = 1, .cs = 10, .swr = 11, .swg = 10, .swb = 12 }, .scan = 54 }, \
+ { .id = 54, .x = 7.688, .y = -2.25, .adr = { .drv = 1, .cs = 10, .swr = 8, .swg = 7, .swb = 9 }, .scan = 55 }, \
+ { .id = 55, .x = 8.438, .y = -2.25, .adr = { .drv = 1, .cs = 11, .swr = 8, .swg = 7, .swb = 9 }, .scan = 56 }, \
+ { .id = 56, .x = 9.469, .y = -2.25, .adr = { .drv = 1, .cs = 11, .swr = 2, .swg = 1, .swb = 3 }, .scan = 57 }, \
+ { .id = 57, .x = 10.5, .y = -2.25, .adr = { .drv = 1, .cs = 11, .swr = 5, .swg = 4, .swb = 6 }, .scan = 58 }, \
+ { .id = 58, .x = 11.25, .y = -2.25, .adr = { .drv = 1, .cs = 7, .swr = 11, .swg = 10, .swb = 12 }, .scan = 59 }, \
+ { .id = 59, .x = 0.094, .y = -3, .adr = { .drv = 2, .cs = 10, .swr = 8, .swg = 7, .swb = 9 }, .scan = 60 }, \
+ { .id = 60, .x = 1.031, .y = -3, .adr = { .drv = 2, .cs = 10, .swr = 5, .swg = 4, .swb = 6 }, .scan = 61 }, \
+ { .id = 61, .x = 1.969, .y = -3, .adr = { .drv = 2, .cs = 10, .swr = 2, .swg = 1, .swb = 3 }, .scan = 62 }, \
+ { .id = 62, .x = 4.781, .y = -3, .adr = { .drv = 2, .cs = 12, .swr = 8, .swg = 7, .swb = 9 }, .scan = 66 }, \
+ { .id = 63, .x = 7.594, .y = -3, .adr = { .drv = 1, .cs = 10, .swr = 5, .swg = 4, .swb = 6 }, .scan = 70 }, \
+ { .id = 64, .x = 8.531, .y = -3, .adr = { .drv = 1, .cs = 10, .swr = 2, .swg = 1, .swb = 3 }, .scan = 71 }, \
+ { .id = 65, .x = 9.75, .y = -3, .adr = { .drv = 1, .cs = 12, .swr = 2, .swg = 1, .swb = 3 }, .scan = 72 }, \
+ { .id = 66, .x = 10.5, .y = -3, .adr = { .drv = 1, .cs = 12, .swr = 8, .swg = 7, .swb = 9 }, .scan = 73 }, \
+ { .id = 67, .x = 11.25, .y = -3, .adr = { .drv = 1, .cs = 12, .swr = 5, .swg = 4, .swb = 6 }, .scan = 74 }, \
+ { .id = 68, .x = -0.338, .y = -3.338, .adr = { .drv = 2, .cs = 11, .swr = 11, .swg = 10, .swb = 12 }, .scan = 255 }, \
+ { .id = 69, .x = 0.39, .y = -3.443, .adr = { .drv = 2, .cs = 11, .swr = 8, .swg = 7, .swb = 9 }, .scan = 255 }, \
+ { .id = 70, .x = 1.263, .y = -3.443, .adr = { .drv = 2, .cs = 11, .swr = 5, .swg = 4, .swb = 6 }, .scan = 255 }, \
+ { .id = 71, .x = 2.135, .y = -3.443, .adr = { .drv = 2, .cs = 11, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 72, .x = 3.008, .y = -3.443, .adr = { .drv = 2, .cs = 12, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 73, .x = 3.88, .y = -3.443, .adr = { .drv = 2, .cs = 12, .swr = 5, .swg = 4, .swb = 6 }, .scan = 255 }, \
+ { .id = 74, .x = 4.753, .y = -3.443, .adr = { .drv = 2, .cs = 13, .swr = 5, .swg = 4, .swb = 6 }, .scan = 255 }, \
+ { .id = 75, .x = 5.625, .y = -3.443, .adr = { .drv = 2, .cs = 13, .swr = 8, .swg = 7, .swb = 9 }, .scan = 255 }, \
+ { .id = 76, .x = 6.497, .y = -3.443, .adr = { .drv = 1, .cs = 9, .swr = 8, .swg = 7, .swb = 9 }, .scan = 255 }, \
+ { .id = 77, .x = 7.37, .y = -3.443, .adr = { .drv = 1, .cs = 9, .swr = 5, .swg = 4, .swb = 6 }, .scan = 255 }, \
+ { .id = 78, .x = 8.242, .y = -3.443, .adr = { .drv = 1, .cs = 9, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 79, .x = 9.115, .y = -3.443, .adr = { .drv = 1, .cs = 13, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 80, .x = 9.987, .y = -3.443, .adr = { .drv = 1, .cs = 13, .swr = 8, .swg = 7, .swb = 9 }, .scan = 255 }, \
+ { .id = 81, .x = 10.86, .y = -3.443, .adr = { .drv = 1, .cs = 13, .swr = 5, .swg = 4, .swb = 6 }, .scan = 255 }, \
+ { .id = 82, .x = 11.588, .y = -3.338, .adr = { .drv = 1, .cs = 13, .swr = 11, .swg = 10, .swb = 12 }, .scan = 255 }, \
+ { .id = 83, .x = 11.693, .y = -2.623, .adr = { .drv = 1, .cs = 12, .swr = 11, .swg = 10, .swb = 12 }, .scan = 255 }, \
+ { .id = 84, .x = 11.693, .y = -1.873, .adr = { .drv = 1, .cs = 8, .swr = 11, .swg = 10, .swb = 12 }, .scan = 255 }, \
+ { .id = 85, .x = 11.693, .y = -1.123, .adr = { .drv = 1, .cs = 8, .swr = 8, .swg = 7, .swb = 9 }, .scan = 255 }, \
+ { .id = 86, .x = 11.693, .y = -0.373, .adr = { .drv = 1, .cs = 8, .swr = 5, .swg = 4, .swb = 6 }, .scan = 255 }, \
+ { .id = 87, .x = 11.588, .y = 0.338, .adr = { .drv = 1, .cs = 8, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 88, .x = 9.908, .y = 0.443, .adr = { .drv = 1, .cs = 6, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 89, .x = 9.288, .y = 0.443, .adr = { .drv = 1, .cs = 5, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 90, .x = 8.625, .y = 0.443, .adr = { .drv = 1, .cs = 4, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 91, .x = 7.875, .y = 0.443, .adr = { .drv = 1, .cs = 3, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 92, .x = 7.125, .y = 0.443, .adr = { .drv = 1, .cs = 2, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 93, .x = 6.375, .y = 0.443, .adr = { .drv = 1, .cs = 1, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 94, .x = 5.625, .y = 0.443, .adr = { .drv = 1, .cs = 14, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 95, .x = 4.875, .y = 0.443, .adr = { .drv = 2, .cs = 8, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 96, .x = 4.125, .y = 0.443, .adr = { .drv = 2, .cs = 7, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 97, .x = 3.375, .y = 0.443, .adr = { .drv = 2, .cs = 6, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 98, .x = 2.625, .y = 0.443, .adr = { .drv = 2, .cs = 5, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 99, .x = 1.875, .y = 0.443, .adr = { .drv = 2, .cs = 4, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 100, .x = 1.125, .y = 0.443, .adr = { .drv = 2, .cs = 3, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 101, .x = -0.338, .y = 0.338, .adr = { .drv = 2, .cs = 1, .swr = 2, .swg = 1, .swb = 3 }, .scan = 255 }, \
+ { .id = 102, .x = -0.443, .y = -0.373, .adr = { .drv = 2, .cs = 1, .swr = 5, .swg = 4, .swb = 6 }, .scan = 255 }, \
+ { .id = 103, .x = -0.443, .y = -1.123, .adr = { .drv = 2, .cs = 1, .swr = 8, .swg = 7, .swb = 9 }, .scan = 255 }, \
+ { .id = 104, .x = -0.443, .y = -1.873, .adr = { .drv = 2, .cs = 1, .swr = 11, .swg = 10, .swb = 12 }, .scan = 255 }, \
+ { .id = 105, .x = -0.443, .y = -2.623, .adr = { .drv = 2, .cs = 10, .swr = 11, .swg = 10, .swb = 12 }, .scan = 255 }, \
+};
+
+
+#define USB_LED_INDICATOR_ENABLE    //Comment out to disable indicator functionality
+#ifdef USB_LED_INDICATOR_ENABLE     //Scan codes refer to actual key matrix codes, not KC_* (255 to disable)
+    #define USB_LED_NUM_LOCK_SCANCODE       255
+    #define USB_LED_CAPS_LOCK_SCANCODE      30
+    #define USB_LED_SCROLL_LOCK_SCANCODE    255
+    #define USB_LED_COMPOSE_SCANCODE        255
+    #define USB_LED_KANA_SCANCODE           255
+#endif //USB_LED_INDICATOR_ENABLE
+
+#endif //_config_led_h_
diff --git a/keyboards/massdrop/alt/info.json b/keyboards/massdrop/alt/info.json
new file mode 100644
index 000000000..8f85bece2
--- /dev/null
+++ b/keyboards/massdrop/alt/info.json
@@ -0,0 +1,80 @@
+{
+    "keyboard_name": "ALT",
+    "url": "https://www.massdrop.com/buy/massdrop-alt-mechanical-keyboard",
+    "maintainer": "Massdrop",
+    "width": 16,
+    "height": 5,
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+              {"label":"ESCAPE", "x":0, "y":0},
+              {"label":"1", "x":1, "y":0},
+              {"label":"2", "x":2, "y":0},
+              {"label":"3", "x":3, "y":0},
+              {"label":"4", "x":4, "y":0},
+              {"label":"5", "x":5, "y":0},
+              {"label":"6", "x":6, "y":0},
+              {"label":"7", "x":7, "y":0},
+              {"label":"8", "x":8, "y":0},
+              {"label":"9", "x":9, "y":0},
+              {"label":"0", "x":10, "y":0},
+              {"label":"MINUS", "x":11, "y":0},
+              {"label":"EQUALS", "x":12, "y":0},
+              {"label":"BACKSPACE", "x":13, "y":0, "w":2},
+              {"label":"DELETE", "x":15, "y":0},
+              {"label":"TAB", "x":0, "y":1, "w":1.5},
+              {"label":"Q", "x":1.5, "y":1},
+              {"label":"W", "x":2.5, "y":1},
+              {"label":"E", "x":3.5, "y":1},
+              {"label":"R", "x":4.5, "y":1},
+              {"label":"T", "x":5.5, "y":1},
+              {"label":"Y", "x":6.5, "y":1},
+              {"label":"U", "x":7.5, "y":1},
+              {"label":"I", "x":8.5, "y":1},
+              {"label":"O", "x":9.5, "y":1},
+              {"label":"P", "x":10.5, "y":1},
+              {"label":"LEFT BRACKET", "x":11.5, "y":1},
+              {"label":"RIGHT BRACKET", "x":12.5, "y":1},
+              {"label":"BACK SLASH", "x":13.5, "y":1, "w":1.5},
+              {"label":"HOME", "x":15, "y":1},
+              {"label":"CAPS LOCK", "x":0, "y":2, "w":1.75},
+              {"label":"A", "x":1.75, "y":2},
+              {"label":"S", "x":2.75, "y":2},
+              {"label":"D", "x":3.75, "y":2},
+              {"label":"F", "x":4.75, "y":2},
+              {"label":"G", "x":5.75, "y":2},
+              {"label":"H", "x":6.75, "y":2},
+              {"label":"J", "x":7.75, "y":2},
+              {"label":"K", "x":8.75, "y":2},
+              {"label":"L", "x":9.75, "y":2},
+              {"label":"SEMICOLON", "x":10.75, "y":2},
+              {"label":"SINGLE TICK", "x":11.75, "y":2},
+              {"label":"ENTER", "x":12.75, "y":2, "w":2.25},
+              {"label":"PAGE UP", "x":15, "y":2},
+              {"label":"LEFT SHIFT", "x":0, "y":3, "w":2.25},
+              {"label":"Z", "x":2.25, "y":3},
+              {"label":"X", "x":3.25, "y":3},
+              {"label":"C", "x":4.25, "y":3},
+              {"label":"V", "x":5.25, "y":3},
+              {"label":"B", "x":6.25, "y":3},
+              {"label":"N", "x":7.25, "y":3},
+              {"label":"M", "x":8.25, "y":3},
+              {"label":"COMMA", "x":9.25, "y":3},
+              {"label":"PERIOD", "x":10.25, "y":3},
+              {"label":"FORWARD SLASH", "x":11.25, "y":3},
+              {"label":"RIGHT SHIFT", "x":12.25, "y":3, "w":1.75},
+              {"label":"UP ARROW", "x":14, "y":3},
+              {"label":"PAGE DOWN", "x":15, "y":3},
+              {"label":"LEFT CTRL", "x":0, "y":4, "w":1.25},
+              {"label":"LEFT WIN", "x":1.25, "y":4, "w":1.25},
+              {"label":"LEFT ALT", "x":2.5, "y":4, "w":1.25},
+              {"label":"SPACEBAR", "x":3.75, "y":4, "w":6.25},
+              {"label":"RIGHT ALT", "x":10, "y":4, "w":1.25},
+              {"label":"FN", "x":11.25, "y":4, "w":1.25},
+              {"label":"LEFT ARROW", "x":13, "y":4},
+              {"label":"DOWN ARROW", "x":14, "y":4},
+              {"label":"RIGHT ARROW", "x":15, "y":4}
+            ]
+        }
+    }
+}
diff --git a/keyboards/massdrop/alt/keymaps/default/keymap.c b/keyboards/massdrop/alt/keymaps/default/keymap.c
new file mode 100644
index 000000000..3f0b84e38
--- /dev/null
+++ b/keyboards/massdrop/alt/keymaps/default/keymap.c
@@ -0,0 +1,200 @@
+#include QMK_KEYBOARD_H
+
+enum alt_keycodes {
+    L_BRI = SAFE_RANGE, //LED Brightness Increase
+    L_BRD,              //LED Brightness Decrease
+    L_PTN,              //LED Pattern Select Next
+    L_PTP,              //LED Pattern Select Previous
+    L_PSI,              //LED Pattern Speed Increase
+    L_PSD,              //LED Pattern Speed Decrease
+    L_T_MD,             //LED Toggle Mode
+    L_T_ONF,            //LED Toggle On / Off
+    L_ON,               //LED On
+    L_OFF,              //LED Off
+    L_T_BR,             //LED Toggle Breath Effect
+    L_T_PTD,            //LED Toggle Scrolling Pattern Direction
+    U_T_AUTO,           //USB Extra Port Toggle Auto Detect / Always Active
+    U_T_AGCR,           //USB Toggle Automatic GCR control
+    DBG_TOG,            //DEBUG Toggle On / Off
+    DBG_MTRX,           //DEBUG Toggle Matrix Prints
+    DBG_KBD,            //DEBUG Toggle Keyboard Prints
+    DBG_MOU,            //DEBUG Toggle Mouse Prints
+};
+
+#define TG_NKRO MAGIC_TOGGLE_NKRO //Toggle 6KRO / NKRO mode
+
+keymap_config_t keymap_config;
+
+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_DEL,  \
+        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_HOME, \
+        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_PGUP, \
+        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_PGDN, \
+        KC_LCTL, KC_LGUI, KC_LALT,                            KC_SPC,                             KC_RALT, MO(1),   KC_LEFT, KC_DOWN, KC_RGHT  \
+    ),
+    [1] = LAYOUT(
+        KC_GRV,  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_MUTE, \
+        L_T_BR,  L_PSD,   L_BRI,   L_PSI,   KC_TRNS, KC_TRNS, KC_TRNS, U_T_AUTO,U_T_AGCR,KC_TRNS, KC_PSCR, KC_SLCK, KC_PAUS, KC_TRNS, KC_TRNS, \
+        L_T_PTD, L_PTP,   L_BRD,   L_PTN,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,          KC_TRNS, KC_VOLU, \
+        KC_TRNS, L_T_MD,  L_T_ONF, KC_TRNS, KC_TRNS, KC_TRNS, TG_NKRO, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,          KC_PGUP, KC_VOLD, \
+        KC_TRNS, KC_TRNS, KC_TRNS,                            KC_TRNS,                            KC_TRNS, KC_TRNS, KC_HOME, KC_PGDN, KC_END  \
+    ),
+    /*
+    [X] = LAYOUT(
+        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, KC_TRNS  \
+    ),
+    */
+};
+
+const uint16_t PROGMEM fn_actions[] = {
+
+};
+
+// Runs just one time when the keyboard initializes.
+void matrix_init_user(void) {
+};
+
+// Runs constantly in the background, in a loop.
+void matrix_scan_user(void) {
+};
+
+#define MODS_SHIFT  (keyboard_report->mods & MOD_BIT(KC_LSHIFT) || keyboard_report->mods & MOD_BIT(KC_RSHIFT))
+#define MODS_CTRL  (keyboard_report->mods & MOD_BIT(KC_LCTL) || keyboard_report->mods & MOD_BIT(KC_RCTRL))
+#define MODS_ALT  (keyboard_report->mods & MOD_BIT(KC_LALT) || keyboard_report->mods & MOD_BIT(KC_RALT))
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {
+        case L_BRI:
+            if (record->event.pressed) {
+                if (LED_GCR_STEP > LED_GCR_MAX - gcr_desired) gcr_desired = LED_GCR_MAX;
+                else gcr_desired += LED_GCR_STEP;
+                if (led_animation_breathing) gcr_breathe = gcr_desired;
+            }
+            return false;
+        case L_BRD:
+            if (record->event.pressed) {
+                if (LED_GCR_STEP > gcr_desired) gcr_desired = 0;
+                else gcr_desired -= LED_GCR_STEP;
+                if (led_animation_breathing) gcr_breathe = gcr_desired;
+            }
+            return false;
+        case L_PTN:
+            if (record->event.pressed) {
+                if (led_animation_id == led_setups_count - 1) led_animation_id = 0;
+                else led_animation_id++;
+            }
+            return false;
+        case L_PTP:
+            if (record->event.pressed) {
+                if (led_animation_id == 0) led_animation_id = led_setups_count - 1;
+                else led_animation_id--;
+            }
+            return false;
+        case L_PSI:
+            if (record->event.pressed) {
+                led_animation_speed += ANIMATION_SPEED_STEP;
+            }
+            return false;
+        case L_PSD:
+            if (record->event.pressed) {
+                led_animation_speed -= ANIMATION_SPEED_STEP;
+                if (led_animation_speed < 0) led_animation_speed = 0;
+            }
+            return false;
+        case L_T_MD:
+            if (record->event.pressed) {
+                led_lighting_mode++;
+                if (led_lighting_mode > LED_MODE_MAX_INDEX) led_lighting_mode = LED_MODE_NORMAL;
+            }
+            return false;
+        case L_T_ONF:
+            if (record->event.pressed) {
+                led_enabled = !led_enabled;
+                I2C3733_Control_Set(led_enabled);
+            }
+            return false;
+        case L_ON:
+            if (record->event.pressed) {
+                led_enabled = 1;
+                I2C3733_Control_Set(led_enabled);
+            }
+            return false;
+        case L_OFF:
+            if (record->event.pressed) {
+                led_enabled = 0;
+                I2C3733_Control_Set(led_enabled);
+            }
+            return false;
+        case L_T_BR:
+            if (record->event.pressed) {
+                led_animation_breathing = !led_animation_breathing;
+                if (led_animation_breathing)
+                {
+                    gcr_breathe = gcr_desired;
+                    led_animation_breathe_cur = BREATHE_MIN_STEP;
+                    breathe_dir = 1;
+                }
+            }
+            return false;
+        case L_T_PTD:
+            if (record->event.pressed) {
+                led_animation_direction = !led_animation_direction;
+            }
+            return false;
+        case U_T_AUTO:
+            if (record->event.pressed && MODS_SHIFT && MODS_CTRL) {
+                usb_extra_manual = !usb_extra_manual;
+                CDC_print("USB extra port manual mode ");
+                CDC_print(usb_extra_manual ? "enabled" : "disabled");
+                CDC_print("\r\n");
+            }
+            return false;
+        case U_T_AGCR:
+            if (record->event.pressed && MODS_SHIFT && MODS_CTRL) {
+                usb_gcr_auto = !usb_gcr_auto;
+                CDC_print("USB GCR auto mode ");
+                CDC_print(usb_gcr_auto ? "enabled" : "disabled");
+                CDC_print("\r\n");
+            }
+            return false;
+        case DBG_TOG:
+            if (record->event.pressed) {
+                debug_enable = !debug_enable;
+                CDC_print("Debug mode ");
+                CDC_print(debug_enable ? "enabled" : "disabled");
+                CDC_print("\r\n");
+            }
+            return false;
+        case DBG_MTRX:
+            if (record->event.pressed) {
+                debug_matrix = !debug_matrix;
+                CDC_print("Debug matrix ");
+                CDC_print(debug_matrix ? "enabled" : "disabled");
+                CDC_print("\r\n");
+            }
+            return false;
+        case DBG_KBD:
+            if (record->event.pressed) {
+                debug_keyboard = !debug_keyboard;
+                CDC_print("Debug keyboard ");
+                CDC_print(debug_keyboard ? "enabled" : "disabled");
+                CDC_print("\r\n");
+            }
+            return false;
+        case DBG_MOU:
+            if (record->event.pressed) {
+                debug_mouse = !debug_mouse;
+                CDC_print("Debug mouse ");
+                CDC_print(debug_mouse ? "enabled" : "disabled");
+                CDC_print("\r\n");
+            }
+            return false;
+        default:
+            return true; //Process all other keycodes normally
+    }
+}
\ No newline at end of file
diff --git a/keyboards/massdrop/alt/led_programs.c b/keyboards/massdrop/alt/led_programs.c
new file mode 100644
index 000000000..b3b7a7e90
--- /dev/null
+++ b/keyboards/massdrop/alt/led_programs.c
@@ -0,0 +1,120 @@
+/*
+Copyright 2018 Massdrop Inc.
+
+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 "alt.h"
+#include "led_matrix.h"
+
+//Teal <-> Salmon
+led_setup_t leds_teal_salmon[] = {
+    { .hs = 0,  .he = 33,  .rs = 24,  .re = 24,  .gs = 215, .ge = 215, .bs = 204, .be = 204, .ef = EF_NONE },
+    { .hs = 33, .he = 66,  .rs = 24,  .re = 255, .gs = 215, .ge = 114, .bs = 204, .be = 118, .ef = EF_NONE },
+    { .hs = 66, .he = 100, .rs = 255, .re = 255, .gs = 114, .ge = 114, .bs = 118, .be = 118, .ef = EF_NONE },
+    { .end = 1 },
+};
+
+//Yellow
+led_setup_t leds_yellow[] = {
+    { .hs = 0, .he = 100, .rs = 255, .re = 255, .gs = 255, .ge = 255, .bs = 0, .be = 0, .ef = EF_NONE },
+    { .end = 1 },
+};
+
+//Off
+led_setup_t leds_off[] = {
+    { .hs = 0, .he = 100, .rs = 0, .re = 0, .gs = 0, .ge = 0, .bs = 0, .be = 0, .ef = EF_NONE },
+    { .end = 1 },
+};
+
+//Red
+led_setup_t leds_red[] = {
+    { .hs = 0, .he = 100, .rs = 255, .re = 255, .gs = 0, .ge = 0, .bs = 0, .be = 0, .ef = EF_NONE },
+    { .end = 1 },
+};
+
+//Green
+led_setup_t leds_green[] = {
+    { .hs = 0, .he = 100, .rs = 0, .re = 0, .gs = 255, .ge = 255, .bs = 0, .be = 0, .ef = EF_NONE },
+    { .end = 1 },
+};
+
+//Blue
+led_setup_t leds_blue[] = {
+    { .hs = 0, .he = 100, .rs = 0, .re = 0, .gs = 0, .ge = 0, .bs = 255, .be = 255, .ef = EF_NONE },
+    { .end = 1 },
+};
+
+//White
+led_setup_t leds_white[] = {
+    { .hs = 0, .he = 100, .rs = 255, .re = 255, .gs = 255, .ge = 255, .bs = 255, .be = 255, .ef = EF_NONE },
+    { .end = 1 },
+};
+
+//White with moving red stripe
+led_setup_t leds_white_with_red_stripe[] = {
+    { .hs = 0, .he = 100, .rs = 255, .re = 255, .gs = 255, .ge = 255, .bs = 255, .be = 255, .ef = EF_NONE },
+    { .hs = 0, .he = 15, .rs = 0, .re = 0, .gs = 0, .ge = 255, .bs = 0, .be = 255, .ef = EF_SCR_R | EF_SUBTRACT },
+    { .hs = 15, .he = 30, .rs = 0, .re = 0, .gs = 255, .ge = 0, .bs = 255, .be = 0, .ef = EF_SCR_R | EF_SUBTRACT },
+    { .end = 1 },
+};
+
+//Black with moving red stripe
+led_setup_t leds_black_with_red_stripe[] = {
+    { .hs = 0, .he = 15, .rs = 0, .re = 255, .gs = 0, .ge = 0, .bs = 0, .be = 0, .ef = EF_SCR_R },
+    { .hs = 15, .he = 30, .rs = 255, .re = 0, .gs = 0, .ge = 0, .bs = 0, .be = 0, .ef = EF_SCR_R },
+    { .end = 1 },
+};
+
+//Rainbow no scrolling
+led_setup_t leds_rainbow_ns[] = {
+    { .hs = 0,      .he = 16.67,  .rs = 255, .re = 255, .gs = 0,   .ge = 255, .bs = 0,   .be = 0,   .ef = EF_OVER },
+    { .hs = 16.67,  .he = 33.33,  .rs = 255, .re = 0,   .gs = 255, .ge = 255, .bs = 0,   .be = 0,   .ef = EF_OVER },
+    { .hs = 33.33,  .he = 50,     .rs = 0,   .re = 0,   .gs = 255, .ge = 255, .bs = 0,   .be = 255, .ef = EF_OVER },
+    { .hs = 50,     .he = 66.67,  .rs = 0,   .re = 0,   .gs = 255, .ge = 0,   .bs = 255, .be = 255, .ef = EF_OVER },
+    { .hs = 66.67,  .he = 83.33,  .rs = 0,   .re = 255, .gs = 0,   .ge = 0,   .bs = 255, .be = 255, .ef = EF_OVER },
+    { .hs = 83.33,  .he = 100,    .rs = 255, .re = 255, .gs = 0,   .ge = 0,   .bs = 255, .be = 0,   .ef = EF_OVER },
+    { .end = 1 },
+};
+
+//Rainbow scrolling
+led_setup_t leds_rainbow_s[] = {
+    { .hs = 0,      .he = 16.67,  .rs = 255, .re = 255, .gs = 0,   .ge = 255, .bs = 0,   .be = 0,   .ef = EF_OVER | EF_SCR_R },
+    { .hs = 16.67,  .he = 33.33,  .rs = 255, .re = 0,   .gs = 255, .ge = 255, .bs = 0,   .be = 0,   .ef = EF_OVER | EF_SCR_R },
+    { .hs = 33.33,  .he = 50,     .rs = 0,   .re = 0,   .gs = 255, .ge = 255, .bs = 0,   .be = 255, .ef = EF_OVER | EF_SCR_R },
+    { .hs = 50,     .he = 66.67,  .rs = 0,   .re = 0,   .gs = 255, .ge = 0,   .bs = 255, .be = 255, .ef = EF_OVER | EF_SCR_R },
+    { .hs = 66.67,  .he = 83.33,  .rs = 0,   .re = 255, .gs = 0,   .ge = 0,   .bs = 255, .be = 255, .ef = EF_OVER | EF_SCR_R },
+    { .hs = 83.33,  .he = 100,    .rs = 255, .re = 255, .gs = 0,   .ge = 0,   .bs = 255, .be = 0,   .ef = EF_OVER | EF_SCR_R },
+    { .end = 1 },
+};
+
+//Add new LED animations here using one from above as example
+//The last entry must be { .end = 1 }
+//Add the new animation name to the list below following its format
+
+void *led_setups[] = {
+    leds_rainbow_s,
+    leds_rainbow_ns,
+    leds_teal_salmon,
+    leds_yellow,
+    leds_red,
+    leds_green,
+    leds_blue,
+    leds_white,
+    leds_white_with_red_stripe,
+    leds_black_with_red_stripe,
+    leds_off
+};
+
+const uint8_t led_setups_count = sizeof(led_setups) / sizeof(led_setups[0]);
diff --git a/keyboards/massdrop/alt/matrix.c b/keyboards/massdrop/alt/matrix.c
new file mode 100644
index 000000000..75a4d62b9
--- /dev/null
+++ b/keyboards/massdrop/alt/matrix.c
@@ -0,0 +1,182 @@
+/*
+Copyright 2018 Massdrop Inc.
+
+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 "alt.h"
+
+#include "d51_util.h"
+#include "debug.h"
+#include "clks.h"
+#include <string.h>
+
+matrix_row_t mlatest[MATRIX_ROWS];
+matrix_row_t mlast[MATRIX_ROWS];
+matrix_row_t mdebounced[MATRIX_ROWS];
+
+uint8_t row_ports[] = { MATRIX_ROW_PORTS };
+uint8_t row_pins[] = { MATRIX_ROW_PINS };
+uint8_t col_ports[] = { MATRIX_COL_PORTS };
+uint8_t col_pins[] = { MATRIX_COL_PINS };
+uint32_t row_masks[2]; //NOTE: If more than PA PB used in the future, adjust code to accomodate
+
+__attribute__ ((weak))
+void matrix_init_kb(void) {
+    matrix_init_user();
+}
+
+__attribute__ ((weak))
+void matrix_scan_kb(void) {
+    matrix_scan_user();
+}
+
+__attribute__ ((weak))
+void matrix_init_user(void) {
+}
+
+__attribute__ ((weak))
+void matrix_scan_user(void) {
+}
+
+void matrix_init(void)
+{
+    memset(mlatest, 0, MATRIX_ROWS * sizeof(matrix_row_t));
+    memset(mlast, 0, MATRIX_ROWS * sizeof(matrix_row_t));
+    memset(mdebounced, 0, MATRIX_ROWS * sizeof(matrix_row_t));
+
+    row_masks[PA] = 0;
+    row_masks[PB] = 0;
+
+    uint8_t row;
+    for (row = 0; row < MATRIX_ROWS; row++)
+    {
+        PORT->Group[row_ports[row]].DIRCLR.reg = 1 << row_pins[row]; //Input
+        PORT->Group[row_ports[row]].OUTCLR.reg = 1 << row_pins[row]; //Low
+        PORT->Group[row_ports[row]].PINCFG[row_pins[row]].bit.INEN = 1; //Input Enable,
+        PORT->Group[row_ports[row]].PINCFG[row_pins[row]].bit.PULLEN = 1; //Pull Enable
+        row_masks[row_ports[row]] |= 1 << row_pins[row]; //Add pin to proper row mask
+    }
+
+    uint8_t col;
+    for (col = 0; col < MATRIX_COLS; col++)
+    {
+        PORT->Group[col_ports[col]].DIRSET.reg = 1 << col_pins[col]; //Output
+        PORT->Group[col_ports[col]].OUTCLR.reg = 1 << col_pins[col]; //Low
+    }
+    
+    matrix_init_quantum();
+}
+
+#define MATRIX_SCAN_DELAY 10   //Delay after setting a col to output (in us)
+
+uint64_t mdebouncing = 0;
+uint8_t matrix_scan(void)
+{
+    uint8_t mchanged;
+    uint8_t row;
+    uint8_t col;
+    uint32_t scans[2]; //PA PB
+
+    if (CLK_get_ms() < mdebouncing) return 1; //mdebouncing == 0 when no debouncing active
+
+    //m15_off; //Profiling scans
+
+    memset(mlatest, 0, MATRIX_ROWS * sizeof(matrix_row_t)); //Zero the result buffer
+
+    for (col = 0; col < MATRIX_COLS; col++)
+    {
+        PORT->Group[col_ports[col]].OUTSET.reg = 1 << col_pins[col]; //Set col output
+
+        CLK_delay_us(MATRIX_SCAN_DELAY); //Delay for output
+
+        scans[PA] = PORT->Group[PA].IN.reg & row_masks[PA]; //Read PA row pins data
+        scans[PB] = PORT->Group[PB].IN.reg & row_masks[PB]; //Read PB row pins data
+
+        PORT->Group[col_ports[col]].OUTCLR.reg = 1 << col_pins[col]; //Clear col output
+
+        for (row = 0; row < MATRIX_ROWS; row++)
+        {
+            //Move scan bits from scans array into proper row bit locations
+            if (scans[row_ports[row]] & (1 << row_pins[row]))
+                mlatest[row] |= 1 << col;
+        }
+    }
+
+    mchanged = 0; //Default to no matrix change since last
+
+    for (row = 0; row < MATRIX_ROWS; row++)
+    {
+        if (mlast[row] != mlatest[row])
+            mchanged = 1;
+        mlast[row] = mlatest[row];
+    }
+
+    if (!mchanged)
+    {
+        for (row = 0; row < MATRIX_ROWS; row++)
+            mdebounced[row] = mlatest[row];
+        mdebouncing = 0;
+    }
+    else
+    {
+        //Begin or extend debounce on change
+        mdebouncing = CLK_get_ms() + DEBOUNCING_DELAY;
+    }
+
+    //m15_on; //Profiling scans
+
+    matrix_scan_quantum();
+
+    return 1;
+}
+
+matrix_row_t matrix_get_row(uint8_t row)
+{
+    return mdebounced[row];
+}
+
+void matrix_print(void)
+{
+    char buf[(MATRIX_COLS+8)*(MATRIX_ROWS+1)] = "R C";
+    char *pbuf = buf+3;
+    uint32_t cols;
+    uint32_t rows;
+    matrix_row_t row;
+
+    for (cols = 1; cols <= MATRIX_COLS; cols++)
+    {
+        *pbuf = (cols%10)+48;
+        pbuf++;
+    }
+    *pbuf = '\r'; pbuf++;
+    *pbuf = '\n'; pbuf++;
+
+    for (rows = 1; rows <= MATRIX_ROWS; rows++)
+    {
+        row = matrix_get_row(rows-1);
+        if (rows < 10) { *pbuf = rows+48; pbuf++; *pbuf = ' '; pbuf++; *pbuf = ' '; pbuf++; }
+        else { *pbuf = (rows/10)+48; pbuf++; *pbuf = (rows%10)+48; pbuf++; *pbuf = ' '; pbuf++; }
+        for (cols = 0; cols < MATRIX_COLS; cols++)
+        {
+            if (row & 1 << cols) *pbuf = 'X';
+            else                 *pbuf = '.';
+            pbuf++;
+        }
+        *pbuf = '\r'; pbuf++;
+        *pbuf = '\n'; pbuf++;
+    }
+    *pbuf = 0;
+    dprint(buf);
+}
diff --git a/keyboards/massdrop/alt/matrix.h b/keyboards/massdrop/alt/matrix.h
new file mode 100644
index 000000000..3eab6dece
--- /dev/null
+++ b/keyboards/massdrop/alt/matrix.h
@@ -0,0 +1,77 @@
+/*
+Copyright 2011 Jun Wako <wakojun@gmail.com>
+
+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/>.
+*/
+#ifndef MATRIX_H
+#define MATRIX_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "keyboard.h"
+
+#if (MATRIX_COLS <= 8)
+typedef  uint8_t    matrix_row_t;
+#elif (MATRIX_COLS <= 16)
+typedef  uint16_t   matrix_row_t;
+#elif (MATRIX_COLS <= 32)
+typedef  uint32_t   matrix_row_t;
+#else
+#error "MATRIX_COLS: invalid value"
+#endif
+
+#define MATRIX_IS_ON(row, col)  (matrix_get_row(row) && (1<<col))
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* number of matrix rows */
+uint8_t matrix_rows(void);
+/* number of matrix columns */
+uint8_t matrix_cols(void);
+/* should be called at early stage of startup before matrix_init.(optional) */
+void matrix_setup(void);
+/* intialize matrix for scaning. */
+void matrix_init(void);
+/* scan all key states on matrix */
+uint8_t matrix_scan(void);
+/* whether modified from previous scan. used after matrix_scan. */
+bool matrix_is_modified(void) __attribute__ ((deprecated));
+/* whether a switch is on */
+bool matrix_is_on(uint8_t row, uint8_t col);
+/* matrix state on row */
+matrix_row_t matrix_get_row(uint8_t row);
+/* print matrix for debug */
+void matrix_print(void);
+
+/* power control */
+void matrix_power_up(void);
+void matrix_power_down(void);
+
+/* executes code for Quantum */
+void matrix_init_quantum(void);
+void matrix_scan_quantum(void);
+
+void matrix_init_kb(void);
+void matrix_scan_kb(void);
+
+void matrix_init_user(void);
+void matrix_scan_user(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/keyboards/massdrop/alt/readme.md b/keyboards/massdrop/alt/readme.md
new file mode 100644
index 000000000..57e2e5f17
--- /dev/null
+++ b/keyboards/massdrop/alt/readme.md
@@ -0,0 +1,20 @@
+# ALT
+
+![ALT](https://massdrop-s3.imgix.net/product-images/alt-keyboard/FP/WNxwR19gTua3nxiiQWP3_AI7B3311%20copy%20page.jpg?auto=format&fm=jpg&fit=max&w=700&h=467&dpr=1&q=80)
+
+The Massdrop ALT is a 65% mechanical keyboard featuring dual USB-C connectors, an integrated Hi-Speed USB 2.0 hub, and fully customizable RGB backlighting and underlighting.
+
+Keyboard Maintainer: [Massdrop](https://github.com/massdrop)  
+Hardware Supported: Massdrop, Inc. ALT PCBs utilizing Microchip's ATSAMD51J18A MCU and USB2422 2-Port USB 2.0 Hi-Speed Hub Controller, and ISSI's IS31FL3733 LED Drivers.  
+Hardware Availability: [Massdrop ALT Mechanical Keyboard](https://www.massdrop.com/buy/massdrop-alt-mechanical-keyboard)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make massdrop/alt:default
+
+For information on flashing this keyboard, visit the following links:
+
+[Massdrop Loader Releases](https://github.com/Massdrop/mdloader/releases/tag/0.0.1)  
+[Massdrop Loader Repository and Instructions](https://github.com/Massdrop/mdloader)
+
+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/massdrop/alt/rules.mk b/keyboards/massdrop/alt/rules.mk
new file mode 100644
index 000000000..daf679585
--- /dev/null
+++ b/keyboards/massdrop/alt/rules.mk
@@ -0,0 +1,32 @@
+# project specific files
+SRC = led_programs.c
+SRC += matrix.c
+
+#For platform and packs
+ARM_ATSAM = SAMD51J18A
+MCU = cortex-m4
+
+CUSTOM_MATRIX = yes
+
+# Build Options
+#   comment out to disable the options.
+#
+BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = no        # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
+CONSOLE_ENABLE = no         # Console for debug(+400)
+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 = yes           # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality on B7 by default
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+MIDI_ENABLE = no            # MIDI support (+2400 to 4200, depending on config)
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+AUDIO_ENABLE = no           # Audio output on port C6
+FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
+HD44780_ENABLE = no         # Enable support for HD44780 based LCDs (+400)
+VIRTSER_ENABLE = no         # USB Serial Driver
+RAW_ENABLE = no             # Raw device