Split atreus (#1680)

* Merge with upstream

* Add split_atreus keymap for lets_split.

* Move bspace

* Tidy up keymap

* Update layer enum

* Temporary fix

* Finish merge

* Added keys for testing

* Revert temporary fix

* Remake keymap using default let's split map as base. ASCII art not
updated

* Remove non-functioning layers

* Rename folder

* Update ASCII art

* Remove vestiges of ADJUST layer

* Remove nonexistent layer #defines

* Rename folder to avoid confusion

* Add Readme.md

* Formatting

* Description of underscores in layer maps

4 files changed, 205 insertions, 0 deletions

diff --git a/keyboards/lets_split/keymaps/henxing/Makefile b/keyboards/lets_split/keymaps/henxing/Makefile
new file mode 100644
index 000000000..457a3d01d
--- /dev/null
+++ b/keyboards/lets_split/keymaps/henxing/Makefile
@@ -0,0 +1,3 @@
+ifndef QUANTUM_DIR
+	include ../../../../Makefile
+endif
diff --git a/keyboards/lets_split/keymaps/henxing/Readme.md b/keyboards/lets_split/keymaps/henxing/Readme.md
new file mode 100644
index 000000000..231aa6adf
--- /dev/null
+++ b/keyboards/lets_split/keymaps/henxing/Readme.md
@@ -0,0 +1,51 @@
+# Let's Split the Atreus
+
+This keymap is a port of the Atreus keymap to the Let's Split keyboard, using a
+similar method of handling layer switches as the `default` keymap.
+
+
+# Layers
+
+The following tables are the layers as implemented.
+
+### Underscores in Layer
+
+Any underscore represents a key that is mapped to `KC_NO`, or no keypress. The
+2x3 block in the middle is like this because the Atreus does not have any keys
+there. It has been left blank for the user to add her own special keypresses or
+macros that she finds useful to have on that particular layer.
+
+
+## `_QWERTY`
+
+```c
+/*
+ *  q   w   e    r    t    _    _    y   u   i  o   p
+ *  a   s   d    f    g    _    _    h   j   k  l   ;
+ *  z   x   c    v    b    _    _    n   m   ,  .   /
+ * esc tab gui shift bksp ctrl alt space fn  -  ' enter
+ */
+ ```
+
+
+## `_LOWER`
+
+```c
+/*
+ *  !       @     up     {    }    _     _  pgup    7     8     9    *
+ *  #     left   down  right  $    _     _  pgdn    4     5     6    +
+ *  [       ]      (     )    &    _     _    `     1     2     3    \
+ * lower  insert  gui  shift bksp ctrl  alt space   fn    .     0    =
+ */
+ ```
+
+## `_RAISE`
+
+```c
+/*
+ * insert home   up   end  pgup   _     _   up     F7    F8    F9   F10
+ *  del   left  down right pgdn   _     _  down    F4    F5    F6   F11
+ *   _   volup    _    _   reset  _     _          F1    F2    F3   F12
+ *   _   voldn super shift bksp  ctrl  alt space   L0  prtsc scroll pause
+ */
+ ```
diff --git a/keyboards/lets_split/keymaps/henxing/config.h b/keyboards/lets_split/keymaps/henxing/config.h
new file mode 100644
index 000000000..7f33a4363
--- /dev/null
+++ b/keyboards/lets_split/keymaps/henxing/config.h
@@ -0,0 +1,37 @@
+/*
+This is the c configuration file for the keymap
+
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+Copyright 2015 Jack Humbert
+
+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_USER_H
+#define CONFIG_USER_H
+
+#include "../../config.h"
+
+/* Use I2C or Serial, not both */
+
+#define USE_SERIAL
+// #define USE_I2C
+
+/* Select hand configuration */
+
+#define MASTER_LEFT
+// #define _MASTER_RIGHT
+// #define EE_HANDS
+
+#endif
\ No newline at end of file
diff --git a/keyboards/lets_split/keymaps/henxing/keymap.c b/keyboards/lets_split/keymaps/henxing/keymap.c
new file mode 100644
index 000000000..49b89b113
--- /dev/null
+++ b/keyboards/lets_split/keymaps/henxing/keymap.c
@@ -0,0 +1,114 @@
+#include "lets_split.h"
+#include "action_layer.h"
+#include "eeconfig.h"
+
+extern keymap_config_t keymap_config;
+
+// Each layer gets a name for readability, which is then used in the keymap matrix below.
+// The underscores don't mean anything - you can have a layer called STUFF or any other name.
+// Layer names don't all need to be of the same length, obviously, and you can also skip them
+// entirely and just use numbers.
+#define _QWERTY 0
+#define _LOWER 1
+#define _RAISE 2
+
+enum custom_keycodes {
+    QWERTY = SAFE_RANGE,
+    LOWER,
+    RAISE
+};
+
+// Fillers to make layering more clear
+#define _______ KC_TRNS
+#define XXXXXXX KC_NO
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+    /*
+     *  q   w   e    r    t    _    _    y   u   i  o   p
+     *  a   s   d    f    g    _    _    h   j   k  l   ;
+     *  z   x   c    v    b    _    _    n   m   ,  .   /
+     * esc tab gui shift bksp ctrl alt space fn  -  ' enter
+     */
+    [_QWERTY] = KEYMAP( \
+            KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_NO,   KC_NO,   KC_Y,    KC_U,     KC_I,    KC_O,    KC_P,    \
+            KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_NO,   KC_NO,   KC_H,    KC_J,     KC_K,    KC_L,    KC_SCLN, \
+            KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_NO,   KC_NO,   KC_N,    KC_M,     KC_COMM, KC_DOT,  KC_SLSH, \
+            KC_ESC, KC_TAB, KC_LGUI,  KC_LSFT,  KC_BSPC, KC_LCTL, KC_LALT, KC_SPC,  LOWER,    KC_MINS, KC_QUOT, KC_ENT   \
+            ),
+
+    /*
+     *  !       @     up     {    }    _     _  pgup    7     8     9    *
+     *  #     left   down  right  $    _     _  pgdn    4     5     6    +
+     *  [       ]      (     )    &    _     _    `     1     2     3    \
+     * lower  insert  gui  shift bksp ctrl  alt space   fn    .     0    =
+     */
+    [_LOWER] = KEYMAP( \
+            KC_EXLM,  KC_AT,   KC_UP,   KC_LCBR, KC_RCBR, KC_NO,   KC_NO,   KC_PGUP, KC_7,    KC_8,   KC_9, KC_ASTR, \
+            KC_HASH,  KC_LEFT, KC_DOWN, KC_RGHT, KC_DEL,  KC_NO,   KC_NO,   KC_PGDN, KC_4,    KC_5,   KC_6, KC_PLUS, \
+            KC_LBRC,  KC_RBRC, KC_LPRN, KC_RPRN, KC_AMPR, KC_NO,   KC_NO,   KC_GRV,  KC_1,    KC_2,   KC_3, KC_BSLS, \
+            RAISE,    KC_INS,  KC_LGUI, KC_LSFT, KC_BSPC, KC_LCTL, KC_LALT, KC_SPC,  KC_TRNS, KC_DOT, KC_0, KC_EQL   \
+            ),
+
+    /*
+     * insert home   up   end  pgup   _     _   up     F7    F8    F9   F10
+     *  del   left  down right pgdn   _     _  down    F4    F5    F6   F11
+     *   _   volup    _    _   reset  _     _          F1    F2    F3   F12
+     *   _   voldn super shift bksp  ctrl  alt space   L0  prtsc scroll pause
+     */
+    [_RAISE] = KEYMAP( \
+            KC_INS,  KC_HOME, KC_UP,   KC_END,  KC_PGUP, KC_NO,   KC_NO,   KC_UP,   KC_F7,    KC_F8,   KC_F9,   KC_F10, \
+            KC_DEL,  KC_LEFT, KC_DOWN, KC_RGHT, KC_PGDN, KC_NO,   KC_NO,   KC_DOWN, KC_F4,    KC_F5,   KC_F6,   KC_F11, \
+            KC_TRNS, KC_VOLU, KC_TRNS, KC_TRNS, RESET,   KC_NO,   KC_NO,   KC_TRNS, KC_F1,    KC_F2,   KC_F3,   KC_F12, \
+            KC_NO,   KC_VOLD, KC_LGUI, KC_LSFT, KC_BSPC, KC_LCTL, KC_LALT, KC_SPC,  QWERTY,   KC_PSCR, KC_SLCK, KC_PAUS \
+            )
+
+};
+
+#ifdef AUDIO_ENABLE
+float tone_qwerty[][2]     = SONG(QWERTY_SOUND);
+float tone_dvorak[][2]     = SONG(DVORAK_SOUND);
+float tone_colemak[][2]    = SONG(COLEMAK_SOUND);
+#endif
+
+void persistent_default_layer_set(uint16_t default_layer) {
+    eeconfig_update_default_layer(default_layer);
+    default_layer_set(default_layer);
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+
+    // The value to return
+    bool return_value = false;
+
+    switch (keycode) {
+        case QWERTY:
+            if (record->event.pressed) {
+#ifdef AUDIO_ENABLE
+                PLAY_SONG(tone_qwerty);
+#endif
+                persistent_default_layer_set(1UL<<_QWERTY);
+            }
+            break;
+
+        case LOWER:
+            if (record->event.pressed) {
+                layer_on(_LOWER);
+            } else {
+                layer_off(_LOWER);
+            }
+            break;
+
+        case RAISE:
+            persistent_default_layer_set(1UL<<_RAISE);
+            break;
+        default:
+
+            // If the keycode is not handled by any of the other cases, we
+            // should return true
+            return_value = true;
+            break;
+    }
+
+    return return_value;
+}