Adding md40 a ckrbd compatible keymap

keyboards/crkbd/keymaps/md40/config.h

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+/*
+This is the c configuration file for the keymap
+
+Copyright 2012 Jun Wako <[email protected]>
+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:https://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#define TAPPING_FORCE_HOLD
+#define TAPPING_TERM 300
+
+#undef RGBLED_NUM
+#define RGBLIGHT_EFFECT_BREATHING
+#define RGBLIGHT_EFFECT_RAINBOW_MOOD
+#define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+#define RGBLIGHT_EFFECT_SNAKE
+#define RGBLIGHT_EFFECT_KNIGHT
+#define RGBLIGHT_EFFECT_CHRISTMAS
+#define RGBLIGHT_EFFECT_STATIC_GRADIENT
+#define RGBLIGHT_EFFECT_RGB_TEST
+#define RGBLIGHT_EFFECT_ALTERNATING
+#define RGBLIGHT_EFFECT_TWINKLE
+#define RGBLED_NUM 27
+#define RGBLIGHT_LIMIT_VAL 120
+#define RGBLIGHT_HUE_STEP 10
+#define RGBLIGHT_SAT_STEP 17
+#define RGBLIGHT_VAL_STEP 17

keyboards/crkbd/keymaps/md40/keymap.c

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+// Copyright 2021 Shane Dowling (@shano)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+#define KC_ESCC MT(MOD_LCTL, KC_ESC)
+#define KC_ENTS MT(MOD_LSFT, KC_ENT)
+#define KC_FN MO(_FN)
+
+enum layers {
+ _QWERTY,
+ _FN,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+ [_QWERTY] = LAYOUT(
+ //,----+----+----+----+----+----. ,----+----+----+----+----+----.
+ KC_TAB , KC_Q , KC_W , KC_E , KC_R , KC_T , KC_Y , KC_U , KC_I , KC_O , KC_P ,KC_BSPC,
+ //|----+----+----+----+----+----| |----+----+----+----+----+----|
+ KC_LSFT, KC_A , KC_S , KC_D , KC_F , KC_G , KC_H , KC_J , KC_K , KC_L ,KC_SCLN,KC_QUOT,
+ //|----+----+----+----+----+----+ |----+----+----+----+----+----|
+ KC_ESCC, KC_Z , KC_X , KC_C , KC_V , KC_B , KC_N , KC_M ,KC_COMM,KC_DOT ,KC_SLSH,KC_ESC ,
+ //`----+----+----+--+-+----+----+----/ \----+----+----+----+----+----+----'
+ KC_LALT,KC_LGUI,KC_SPC , KC_ENTS,KC_FN,KC_FN
+ // `----+----+----' `+---+----+----'c
+ ),
+ [_FN] = LAYOUT(
+ //,----+----+----+----+----+----. ,----+----+----+----+----+----.
+ _______,KC_1, KC_2 ,KC_3, KC_4,KC_5, KC_6,KC_7,KC_8,KC_9,KC_0,KC_BSPC,
+ //|----+----+----+----+----+----| |----+----+----+----+----+----|
+ _______,KC_EXCLAIM,KC_AT,KC_HASH,KC_DOLLAR,KC_PERCENT, KC_LEFT,KC_DOWN, KC_UP ,KC_RIGHT,KC_LBRC,KC_RBRC,
+ //|----+----+----+----+----+----+ |----+----+----+----+----+----|
+ _______, KC_CIRCUMFLEX , KC_AMPR , KC_ASTERISK , KC_LEFT_PAREN , KC_RIGHT_PAREN , KC_MINUS,KC_PLUS,KC_EQL,KC_PIPE,KC_GRAVE,KC_BACKSLASH,
+ //`----+----+----+--+-+----+----+----/ \----+----+----+----+----+----+----'
+ _______,_______,_______ , _______,_______,_______
+ // `----+----+----' `----+----+----'
+ )
+};
+

keyboards/crkbd/keymaps/md40/readme.md

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+# MD40: Minimally Disruptive 40% Keymap
+
+This keymap is an attempt to go from a standard keyboard layout to a 40% keyboard with minimal disruption.
+
+Some aims:
+- Two layers only
+- Existing keyboard positions where possible
+- Exceptions where it's not possible
+- Exceptions where it makes sense
+
+Supports crkbd only.
+
+## Base Layer
+
+![Base Layer](https://i.imgur.com/hXLP6ush.png)
+
+## Fn Layer
+
+![Base Layer](https://i.imgur.com/Sozd1p8h.png)

keyboards/crkbd/keymaps/md40/rules.mk

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+
+# Build Options
+# change to "no" to disable the options, or define them in the Makefile in
+# the appropriate keymap folder that will get included automatically
+#
+BOOTMAGIC_ENABLE = no # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = no # Mouse keys
+NKRO_ENABLE = no # Enable N-Key Rollover