[keyboard] Add chavdai40 keyboard (#9820)

* On branch add_chavdai40_keyboard

Changes to be committed:
	new file:   keyboards/chavdai40/boards/GENERIC_STM32_F042X6/board.c
	new file:   keyboards/chavdai40/boards/GENERIC_STM32_F042X6/board.h
	new file:   keyboards/chavdai40/boards/GENERIC_STM32_F042X6/board.mk
	new file:   keyboards/chavdai40/bootloader_defs.h
	new file:   keyboards/chavdai40/chavdai40.c
	new file:   keyboards/chavdai40/chavdai40.h
	new file:   keyboards/chavdai40/chconf.h
	new file:   keyboards/chavdai40/config.h
	new file:   keyboards/chavdai40/halconf.h
	new file:   keyboards/chavdai40/info.json
	new file:   keyboards/chavdai40/keymaps/42keys-dvorak/config.h
	new file:   keyboards/chavdai40/keymaps/42keys-dvorak/keymap.c
	new file:   keyboards/chavdai40/keymaps/42keys-eucalyn/config.h
	new file:   keyboards/chavdai40/keymaps/42keys-eucalyn/keymap.c
	new file:   keyboards/chavdai40/keymaps/42keys-qwerty/config.h
	new file:   keyboards/chavdai40/keymaps/42keys-qwerty/keymap.c
	new file:   keyboards/chavdai40/keymaps/44keys-dvorak/config.h
	new file:   keyboards/chavdai40/keymaps/44keys-dvorak/keymap.c
	new file:   keyboards/chavdai40/keymaps/44keys-eucalyn/config.h
	new file:   keyboards/chavdai40/keymaps/44keys-eucalyn/keymap.c
	new file:   keyboards/chavdai40/keymaps/44keys-qwerty/config.h
	new file:   keyboards/chavdai40/keymaps/44keys-qwerty/keymap.c
	new file:   keyboards/chavdai40/keymaps/default/config.h
	new file:   keyboards/chavdai40/keymaps/default/keymap.c
	new file:   keyboards/chavdai40/mcuconf.h
	new file:   keyboards/chavdai40/readme.md
	new file:   keyboards/chavdai40/rules.mk

* commit suggestions of zvecr and fauxpark, thanks

* commit suggestions of fauxpark, thanks

* commit suggestions of fauxpark, thanks

* commit suggestions of drashna, thanks

2 files changed, 62 insertions, 0 deletions

diff --git a/keyboards/chavdai40/keymaps/42keys-eucalyn/config.h b/keyboards/chavdai40/keymaps/42keys-eucalyn/config.h
new file mode 100644
index 0000000000..bbcd7cdf98
--- /dev/null
+++ b/keyboards/chavdai40/keymaps/42keys-eucalyn/config.h
@@ -0,0 +1,22 @@
+/* Copyright 2020 t-miyajima
+ *
+ * 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
+
+// place overrides here
+#define PERMISSIVE_HOLD
+#define RETRO_TAPPING
+#define TAPPING_TERM 5
diff --git a/keyboards/chavdai40/keymaps/42keys-eucalyn/keymap.c b/keyboards/chavdai40/keymaps/42keys-eucalyn/keymap.c
new file mode 100644
index 0000000000..a464a586e7
--- /dev/null
+++ b/keyboards/chavdai40/keymaps/42keys-eucalyn/keymap.c
@@ -0,0 +1,40 @@
+ /* Copyright 2020 t-miyajima
+ *
+ * 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 QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  /* Keymap _BL: (Base Layer) Default Layer
+   * ,-------------------------------------------------------.
+   * | Tab |  ;|  ,|  .|  P|  Q|  Y|  G|  D|  M|  F|  -| Bspc|
+   * |-------------------------------------------------------|
+   * | Ctrl  |  A|  O|  E|  I|  U|  B|  N|  T|  R|  S| Return|
+   * |-------------------------------------------------------|
+   * | Shift  |  Z|  X|  C|  V|  W|  H|  J|  K|  L|   /| Lyr|
+   * `----.---------------------------------------------.---'
+   *      | Alt |Win |           Space        |Win |Alt |
+   *      `---------------------------------------------'
+   */
+    LAYOUT_42key( /* Base */
+        KC_TAB, KC_SCOLON, KC_COMMA, KC_DOT, KC_P, KC_Q, KC_Y, KC_G, KC_D, KC_M, KC_F, KC_MINUS, KC_BSPACE,
+        KC_LCTRL, KC_A, KC_O, KC_E, KC_I, KC_U, KC_B, KC_N, KC_T, KC_R, KC_S, KC_ENTER,
+        KC_LSFT, KC_Z, KC_X, KC_C, KC_V, KC_W, KC_H, KC_J, KC_K, KC_L, KC_SLASH, MO(1),
+        KC_LALT, KC_LGUI, KC_SPACE, KC_RGUI, KC_RALT),
+    LAYOUT_42key( /* layer 1 */
+        KC_GRAVE, KC_EXCLAIM, KC_AT, KC_HASH, KC_QUOTE, KC_PERCENT, KC_CIRCUMFLEX, KC_AMPERSAND, KC_ASTERISK, KC_LEFT_PAREN, KC_RIGHT_PAREN, KC_LBRACKET, KC_RBRACKET,
+        KC_TRNS, KC_1, KC_2, KC_3, KC_4, KC_5, KC_6, KC_7, KC_8, KC_9, KC_0, KC_TRNS,
+        KC_TRNS, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, KC_EQUAL, KC_TRNS,
+        KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS),
+};