[Keyboard] Concertina (#11922)

* [Keyboard] Concertina

* Added a novel handwired keyboard.

* Concertina lint

* Perfunctory changes to pass CI.

* Concertina line width

* Changes from code review: GPL headers, modernization, full-width
  representation of matrix to match info.json.

1 files changed, 56 insertions, 0 deletions

diff --git a/keyboards/handwired/concertina/64key/64key.h b/keyboards/handwired/concertina/64key/64key.h
new file mode 100644
index 0000000000..a9e557fc78
--- /dev/null
+++ b/keyboards/handwired/concertina/64key/64key.h
@@ -0,0 +1,56 @@
+/* Copyright 2020-2021 Viktor Eikman
+ *
+ * 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"
+
+/*
+ * The matrix is constructed for ease of soldering and for density.
+ * The nomenclature is <side><cluster>_<column><row>.
+ *
+ * L: Left hand.
+ * R: Right hand.
+ * T: Thumb cluster.
+ * M: Main cluster.
+ *
+ * Numbers increase going to the right and away from the user on the
+ * right-hand side of the keyboard, looking directly at each of the two
+ * key clusters (main and thumb), one by one.
+ * This coordinate system is mirrored for the left-hand side.
+ */
+
+#define LAYOUT_64key( \
+                  LT_32, LT_22, LT_12,                 RT_12, RT_22, RT_32,               \
+                  LT_31, LT_21, LT_11, LT_01,   RT_01, RT_11, RT_21, RT_31,               \
+                         LT_20, LT_10, LT_00,   RT_00, RT_10, RT_20,                      \
+                                                                                          \
+                  LM_34, LM_24, LM_14, LM_04,   RM_04, RM_14, RM_24, RM_34,               \
+    LM_53, LM_43, LM_33, LM_23, LM_13, LM_03,   RM_03, RM_13, RM_23, RM_33, RM_43, RM_53, \
+    LM_52, LM_42, LM_32, LM_22, LM_12, LM_02,   RM_02, RM_12, RM_22, RM_32, RM_42, RM_52, \
+    LM_51, LM_41, LM_31, LM_21, LM_11,                 RM_11, RM_21, RM_31, RM_41, RM_51, \
+                         LM_20,                               RM_20                       \
+  ) \
+  { \
+    { LT_00, LT_10, LT_20, LT_31, LM_20, LM_31, LM_41, LM_51 }, \
+    { LT_01, LT_11, LT_21, LM_11, LM_21, LM_32, LM_42, LM_52 }, \
+    { LT_12, LT_22, LT_32, LM_12, LM_22, LM_33, LM_43, LM_53 }, \
+    { LM_02, LM_03, LM_04, LM_13, LM_23, LM_14, LM_24, LM_34 }, \
+    { RT_00, RT_10, RT_20, RT_31, RM_20, RM_31, RM_41, RM_51 }, \
+    { RT_01, RT_11, RT_21, RM_11, RM_21, RM_32, RM_42, RM_52 }, \
+    { RT_12, RT_22, RT_32, RM_12, RM_22, RM_33, RM_43, RM_53 }, \
+    { RM_02, RM_03, RM_04, RM_13, RM_23, RM_14, RM_24, RM_34 }, \
+  }