Added my Balance 12 layout for Atreus (#3336)

* New Balance Twelve-based layout for the Atreus keyboard

* Rearrange cursor keys. Fix layout comment typo.

* Added Balance 12 layout for Atreus

* Changes following review.

3 files changed, 208 insertions, 0 deletions

diff --git a/keyboards/atreus/keymaps/yttyx/README.md b/keyboards/atreus/keymaps/yttyx/README.md
new file mode 100644
index 0000000000..9ed9d6239b
--- /dev/null
+++ b/keyboards/atreus/keymaps/yttyx/README.md
@@ -0,0 +1,77 @@
+# Overview
+
+A Balance 12 layout for the Atreus keyboard.
+
+Balance 12 was created by Sasha Viminitz. Please see [this page](https://mathematicalmulticore.wordpress.com/the-keyboard-layout-project/)
+for some background on the design of the layout.
+
+* The variant used here is a mirror of the original for left-handers
+* The central column of punctuation keys has been moved elsewhere
+* Home positions for the left and right forefingers are *T* and *A* respectively
+
+## To build/flash
+
+> make atreus:yttyx:avrdude
+
+## Layers
+
+### Base:
+
+      .----------------------------------.         .------------------------------.
+      | P    | L    | C    | D   | W     |         | U    | O   | Y   | K   | Q   |
+      +------+------+------+-----+-------|         |------+-----+-----+-----+-----|
+      | N    | R    | S    | T   | M     |         | A    | E   | I   | H   | V   |
+      +------+------+------+-----+-------|         |------+-----+-----+-----+-----|
+      | Z    | J    | F    | G   | B     |         | ,    | .   | ;   | X   | -   |
+      +------+------+------+-----+-------+---------+------+-----+-----+-----+-----|
+      | Shft | Ctl  | Alt  | BS  | Space | L1 | R1 | Shft | R2  | Win | Ctl | Alt |
+      '---------------------------------------------------------------------------'
+
+### L1:
+
+      .---------------------------------.         .--------------------------------.
+      | 1    | 2    | 3    | 4  | 5     |         | 6    | 7  | 8   | 9    | 0     |
+      |------+------+------+----+-------|         |------+----+-----+------+-------|
+      | Tab  | ?    | =    | -  | _     |         | '    | "  | +   | *    | Enter |
+      |------+------+------+----+-------|         |------+----+-----+------+-------|
+      | Esc  | !    | &    |    |       |         | ,    | .  | ;   |      | -     |
+      |------+------+------+----+-------+---------+------+----+-----+------+-------|
+      | Shft | Ctrl | Alt  | Bk | Space | L1 | R1 | Shft | R2 | Sup | Ctrl | Alt   |
+      '----------------------------------------------------------------------------'
+
+### R1:
+
+      .---------------------------------.         .-------------------------------.
+      | <    | >    | {   | }   | @     |         | $    | £  |     |      | R3   |
+      +------+------+-----+-----|-------|         |------+----+-----+------+------|
+      | [    | ]    | (   | )   | #     |         | '    | "  | ~   | `    | Caps |
+      |------+------+-----+-----+-------|         |------+----+-----+------+------|
+      | /    | \    | ^   | |   | %     |         | ,    | .  | ;   |      | PScn |
+      |------+------+-----+-----+-------+---------+------+----+-----+------+------|
+      | Shft | Ctrl | Alt | Del | Space | L1 | R1 | Shft | R2 | Sup | Ctrl | Alt  |
+      '---------------------------------------------------------------------------'
+
+### R2:
+
+      .-----------------------------------.         .--------------------.-----------------.
+      | F12  | F11  | F10  | F9   | Copy  |         | Home | Up   | End  | PgUp | Insert   |
+      |------+------+------+------+-------|         |------+------+------+------+----------|
+      | F8   | F7   | F6   | F5   | Paste |         | Left | Down | Right| PgDn | Enter    |
+      |------+------+------+------+-------|         |------+------+------+------+----------|
+      | F4   | F3   | F2   | F1   | Cut   |         | ^Tab |      | Tab  |      |          |
+      |------+------+------+------+-------+---------+------+------+------+------+----------|
+      | Shft | Ctrl | Alt  | Del  | Undo  | L1 | R1 | Shft | R2   | Sup  | Ctrl | WinRight |
+      '------------------------------------------------------------------------------------'
+
+### R3:
+
+      .----------------------------.         .------------------------.
+      | RESET |    |     |    |    |         |    |    |    |    | R3 |
+      |-------+----+-----+----+----|         |----+----+----+----+----|
+      |       |    |     |    |    |         |    |    |    |    |    |
+      |-------+----+-----+----+----|         |----+----+----+----+----|
+      |       |    |     |    |    |         |    |    |    |    |    |
+      |-------+----+-----+----+----+---------+----+----+----+----+----|
+      |       |    |     |    |    |    |    |    |    |    |    |    |
+      '---------------------------------------------------------------'
+
diff --git a/keyboards/atreus/keymaps/yttyx/config.h b/keyboards/atreus/keymaps/yttyx/config.h
new file mode 100644
index 0000000000..68e0225e00
--- /dev/null
+++ b/keyboards/atreus/keymaps/yttyx/config.h
@@ -0,0 +1,12 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#define ONESHOT_TIMEOUT       500   // Time (in ms) before the one shot key is released
+
+// Disable some options to reduce firmware size
+#define NO_PRINT
+#define NO_ACTION_TAPPING
+#define NO_ACTION_MACRO
+#define NO_ACTION_FUNCTION
+
+#endif
diff --git a/keyboards/atreus/keymaps/yttyx/keymap.c b/keyboards/atreus/keymaps/yttyx/keymap.c
new file mode 100644
index 0000000000..8773a9734b
--- /dev/null
+++ b/keyboards/atreus/keymaps/yttyx/keymap.c
@@ -0,0 +1,119 @@
+ 
+#include QMK_KEYBOARD_H
+
+enum layers {
+  BASE,         // Balance Twelve
+  L1,           // (momentary)
+  R1,           // (momentary)
+  R2,           // (momentary)
+  R3            // (momentary)
+};
+
+#define xxxxxxx    KC_NO
+#define _______    KC_TRNS
+
+// Aliases from replicaJunction's atreus layout
+#define KCX_LST   LSFT(KC_TAB)
+#define KX_COPY   LCTL(KC_C)
+#define KX_CUT    LCTL(KC_X)
+#define KX_PAST   LCTL(KC_V)
+#define KX_UNDO   LCTL(KC_Z)
+
+#define KX_AT     LSFT(KC_QUOT)
+#define KX_PIPE   LSFT(KC_NUBS)
+#define KX_WINR   LSFT(LGUI(KC_RGHT))   // Move window to next monitor (Windows)
+
+
+const uint16_t PROGMEM keymaps[][ MATRIX_ROWS ][ MATRIX_COLS ] = {
+
+ /* Balance Twelve mirror variant (left-handed)
+  .--------------------------------.         .------------------------------.
+  | P    | L    | C   | D  | W     |         | U    | O  | Y   | K    | Q   |
+  +------+------+-----+----+-------|         |------+----+-----+------+-----|
+  | N    | R    | S   | T  | M     |         | A    | E  | I   | H    | V   |
+  +------+------+-----+----+-------|         |------+----+-----+------+-----|
+  | Z    | J    | F   | G  | B     |         | ,    | .  | ;   | X    | -   |
+  +------+------+-----+----+-------+---------+------+----+-----+------+-----|
+  | Shft | Ctrl | Alt | Bk | Space | L1 | R1 | Shft | R2 | Win | Ctrl | Alt |
+  '-------------------------------------------------------------------------'
+  */
+  [BASE] = LAYOUT(
+    KC_P,    KC_L,    KC_C,    KC_D,    KC_W,                   KC_U,          KC_O,   KC_Y,    KC_K,    KC_Q,
+    KC_N,    KC_R,    KC_S,    KC_T,    KC_M,                   KC_A,          KC_E,   KC_I,    KC_H,    KC_V,
+    KC_Z,    KC_J,    KC_F,    KC_G,    KC_B,                   KC_COMM,       KC_DOT, KC_SCLN, KC_X,    KC_MINS,
+    KC_LSFT, KC_LCTL, KC_LALT, KC_BSPC, KC_SPC, MO(L1), MO(R1), OSM(MOD_LSFT), MO(R2), KC_LWIN, KC_RCTL, KC_RALT
+  ),
+
+ /* L1
+  .---------------------------------.         .--------------------------------.
+  | 1    | 2    | 3    | 4  | 5     |         | 6    | 7  | 8   | 9    | 0     |
+  |------+------+------+----+-------|         |------+----+-----+------+-------|
+  | Tab  | ?    | =    | -  | _     |         | '    | "  | +   | *    | Enter |
+  |------+------+------+----+-------|         |------+----+-----+------+-------|
+  | Esc  | !    | &    |    |       |         | ,    | .  | ;   |      | -     |
+  |------+------+------+----+-------+---------+------+----+-----+------+-------|
+  | Shft | Ctrl | Alt  | Bk | Space | L1 | R1 | Shft | R2 | Sup | Ctrl | Alt   |
+  '----------------------------------------------------------------------------'
+  */
+  [L1] = LAYOUT(
+    KC_1,    KC_2,    KC_3,    KC_4,    KC_5,                      KC_6,    KC_7,       KC_8,    KC_9,    KC_0,
+    KC_TAB,  KC_QUES, KC_EQL,  KC_MINS, KC_UNDS,                   KC_QUOT, LSFT(KC_2), KC_PLUS, KC_ASTR, KC_ENT,
+    KC_ESC,  KC_EXLM, KC_AMPR, xxxxxxx, xxxxxxx,                   _______, _______,    _______, xxxxxxx, _______,
+    _______, _______, _______, _______, _______, _______, _______, _______, _______,    _______, _______, _______
+  ),
+
+ /* R1
+  .---------------------------------.         .-------------------------------.
+  | <    | >    | {   | }   | @     |         | $    | £  |     |      | R3   |
+  +------+------+-----+-----|-------|         |------+----+-----+------+------|
+  | [    | ]    | (   | )   | #     |         | '    | "  | ~   | `    | Caps |
+  |------+------+-----+-----+-------|         |------+----+-----+------+------|
+  | /    | \    | ^   | |   | %     |         | ,    | .  | ;   |      | PScn |
+  |------+------+-----+-----+-------+---------+------+----+-----+------+------|
+  | Shft | Ctrl | Alt | Del | Space | L1 | R1 | Shft | R2 | Sup | Ctrl | Alt  |
+  '---------------------------------------------------------------------------'
+  */
+  [R1] = LAYOUT(
+    KC_LABK, KC_RABK,  KC_LCBR,  KC_RCBR, KX_AT,                     KC_DLR,  KC_HASH,    xxxxxxx,       xxxxxxx, MO(R3),
+    KC_LBRC, KC_RBRC,  KC_LPRN,  KC_RPRN, KC_NUHS,                   KC_QUOT, LSFT(KC_2), LSFT(KC_NUHS), KC_GRV,  KC_CAPS,
+    KC_SLSH, KC_NUBS,  KC_CIRC,  KX_PIPE, KC_PERC,                   _______, _______,    _______,       xxxxxxx, KC_PSCR,
+    _______, _______,  _______,  KC_DEL,  _______, _______, _______, _______, _______,    _______,       _______, _______
+  ),
+
+ /* R2
+  .-----------------------------------.         .--------------------.-----------------.
+  | F12  | F11  | F10  | F9   | Copy  |         | Home | Up   | End  | PgUp | Insert   |
+  |------+------+------+------+-------|         |------+------+------+------+----------|
+  | F8   | F7   | F6   | F5   | Paste |         | Left | Down | Right| PgDn | Enter    |
+  |------+------+------+------+-------|         |------+------+------+------+----------|
+  | F4   | F3   | F2   | F1   | Cut   |         | ^Tab |      | Tab  |      |          |
+  |------+------+------+------+-------+---------+------+------+------+------+----------|
+  | Shft | Ctrl | Alt  | Del  | Undo  | L1 | R1 | Shft | R2   | Sup  | Ctrl | WinRight |
+  '------------------------------------------------------------------------------------'
+  */
+  [R2] = LAYOUT(
+    KC_F12,  KC_F11,  KC_F10,  KC_F9,  KX_COPY,                   KC_HOME, KC_UP,   KC_END,  KC_PGUP, KC_INS, 
+    KC_F8,   KC_F7,   KC_F6,   KC_F5,  KX_PAST,                   KC_LEFT, KC_DOWN, KC_RGHT, KC_PGDN, KC_ENT,
+    KC_F4,   KC_F3,   KC_F2,   KC_F1,  KX_CUT,                    KCX_LST, xxxxxxx, KC_TAB,  xxxxxxx, xxxxxxx, 
+    _______, _______, _______, KC_DEL, KX_UNDO, _______, _______, _______, _______, _______, _______, KX_WINR
+  ),
+
+ /* R3
+  .----------------------------.         .------------------------.
+  | RESET |    |     |    |    |         |    |    |    |    | R3 |
+  |-------+----+-----+----+----|         |----+----+----+----+----|
+  |       |    |     |    |    |         |    |    |    |    |    |
+  |-------+----+-----+----+----|         |----+----+----+----+----|
+  |       |    |     |    |    |         |    |    |    |    |    |
+  |-------+----+-----+----+----+---------+----+----+----+----+----|
+  |       |    |     |    |    |    |    |    |    |    |    |    |
+  '---------------------------------------------------------------'
+  */
+  [R3] = LAYOUT(
+    RESET,   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, xxxxxxx, xxxxxxx, 
+    xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx, xxxxxxx
+  )
+};
+