[Handwired] Support for Adafruit lemon keypad (#16395)

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: zvecr <git@zvecr.com>

keyboards/handwired/lemonpad/config.h

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+/* Copyright 2022 dari-studios (@dari-studios)
+ *
+ * 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 "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID    0x6473
+#define PRODUCT_ID   0x4C50
+#define DEVICE_VER   0x0001
+#define MANUFACTURER dari-studios
+#define PRODUCT      lemonpad
+
+/* key matrix size */
+#define MATRIX_ROWS 2
+#define MATRIX_COLS 3
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+
+#define DIRECT_PINS { 	\
+    { E6, D7, C6 }, 	\
+    { B4, B5, D4 }  	\
+}
+#define UNUSED_PINS
+
+//#define BACKLIGHT_PIN B7
+//#define BACKLIGHT_LEVELS 3
+//#define BACKLIGHT_BREATHING
+
+//#define RGB_DI_PIN E2
+//#ifdef RGB_DI_PIN
+//#    define RGBLED_NUM 16
+//#    define RGBLIGHT_HUE_STEP 8
+//#    define RGBLIGHT_SAT_STEP 8
+//#    define RGBLIGHT_VAL_STEP 8
+//#    define RGBLIGHT_LIMIT_VAL 255 /* The maximum brightness level */
+//#    define RGBLIGHT_SLEEP  /* If defined, the RGB lighting will be switched off when the host goes to sleep */
+/*== all animations enable ==*/
+//#    define RGBLIGHT_ANIMATIONS
+/*== or choose animations ==*/
+//#    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
+/*== customize breathing effect ==*/
+/*==== (DEFAULT) use fixed table instead of exp() and sin() ====*/
+//#    define RGBLIGHT_BREATHE_TABLE_SIZE 256      // 256(default) or 128 or 64
+/*==== use exp() and sin() ====*/
+//#    define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85  // 1 to 2.7
+//#    define RGBLIGHT_EFFECT_BREATHE_MAX    255   // 0 to 255
+//#endif
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* define if matrix has ghost (lacks anti-ghosting diodes) */
+//#define MATRIX_HAS_GHOST
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+/* If defined, GRAVE_ESC will always act as ESC when CTRL is held.
+ * This is useful for the Windows task manager shortcut (ctrl+shift+esc).
+ */
+//#define GRAVE_ESC_CTRL_OVERRIDE
+
+/*
+ * Force NKRO
+ *
+ * Force NKRO (nKey Rollover) to be enabled by default, regardless of the saved
+ * state in the bootmagic EEPROM settings. (Note that NKRO must be enabled in the
+ * makefile for this to work.)
+ *
+ * If forced on, NKRO can be disabled via magic key (default = LShift+RShift+N)
+ * until the next keyboard reset.
+ *
+ * NKRO may prevent your keystrokes from being detected in the BIOS, but it is
+ * fully operational during normal computer usage.
+ *
+ * For a less heavy-handed approach, enable NKRO via magic key (LShift+RShift+N)
+ * or via bootmagic (hold SPACE+N while plugging in the keyboard). Once set by
+ * bootmagic, NKRO mode will always be enabled until it is toggled again during a
+ * power-up.
+ *
+ */
+//#define FORCE_NKRO
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+
+/* disable these deprecated features by default */
+#define NO_ACTION_MACRO
+#define NO_ACTION_FUNCTION
+
+/* Bootmagic Lite key configuration */
+//#define BOOTMAGIC_LITE_ROW 0
+//#define BOOTMAGIC_LITE_COLUMN 0

keyboards/handwired/lemonpad/info.json

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+{
+    "keyboard_name": "lemonpad",
+    "url": "",
+    "maintainer": "dari-studios",
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"label": "k00", "x": 0, "y": 0},
+                {"label": "k01", "x": 1, "y": 0},
+                {"label": "k02", "x": 2, "y": 0},
+
+                {"label": "k10", "x": 0, "y": 1},
+                {"label": "k11", "x": 1, "y": 1},
+                {"label": "k12", "x": 2, "y": 1}
+            ]
+        }
+    }
+}

keyboards/handwired/lemonpad/keymaps/default/keymap.c

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+/* Copyright 2022 dari-studios (@dari-studios)
+ *
+ * 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
+
+/* Defines names for use in layer keycodes and the keymap*/
+
+enum layer_names {
+    	_BASE,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    	[_BASE] = LAYOUT(
+        		KC_A,    KC_B,    KC_C,
+        		KC_D,    KC_E,    KC_F 
+    	),
+
+};

keyboards/handwired/lemonpad/keymaps/default/readme.md

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+# The default keymap for lemonpad

keyboards/handwired/lemonpad/keymaps/via/config.h

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+/* Copyright 2022 dari-studios (@dari-studios)
+ *
+ * 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
+
+#define DYNAMIC_KEYMAP_LAYER_COUNT 9

keyboards/handwired/lemonpad/keymaps/via/keymap.c

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+/* Copyright 2022 dari-studios (@dari-studios)
+ *
+ * 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
+
+/* Defines names for use in layer keycodes and the keymap */
+
+enum layer_names {
+        _BASE,
+        _EMPTY1,
+        _EMPTY2,
+        _EMPTY3,
+        _EMPTY4,
+        _EMPTY5,
+        _EMPTY6,
+        _EMPTY7,
+        _EMPTY8
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+        [_BASE] = LAYOUT(
+                KC_A,    KC_B,    KC_C,
+                KC_D,    KC_E,    KC_F 
+        ),
+
+        [_EMPTY1] = LAYOUT(
+                KC_TRNS,    KC_TRNS,    KC_TRNS,
+                KC_TRNS,    KC_TRNS,    KC_TRNS
+        ),
+
+        [_EMPTY2] = LAYOUT(
+                KC_TRNS,    KC_TRNS,    KC_TRNS,
+                KC_TRNS,    KC_TRNS,    KC_TRNS
+        ),
+
+        [_EMPTY3] = LAYOUT(
+                KC_TRNS,    KC_TRNS,    KC_TRNS,
+                KC_TRNS,    KC_TRNS,    KC_TRNS
+        ),
+
+        [_EMPTY4] = LAYOUT(
+                KC_TRNS,    KC_TRNS,    KC_TRNS,
+                KC_TRNS,    KC_TRNS,    KC_TRNS
+        ),
+
+        [_EMPTY5] = LAYOUT(
+                KC_TRNS,    KC_TRNS,    KC_TRNS,
+                KC_TRNS,    KC_TRNS,    KC_TRNS
+        ),
+
+        [_EMPTY6] = LAYOUT(
+                KC_TRNS,    KC_TRNS,    KC_TRNS,
+                KC_TRNS,    KC_TRNS,    KC_TRNS
+        ),
+
+        [_EMPTY7] = LAYOUT(
+                KC_TRNS,    KC_TRNS,    KC_TRNS,
+                KC_TRNS,    KC_TRNS,    KC_TRNS
+        ),
+
+        [_EMPTY8] = LAYOUT(
+                KC_TRNS,    KC_TRNS,    KC_TRNS,
+                KC_TRNS,    KC_TRNS,    KC_TRNS
+        )
+};

keyboards/handwired/lemonpad/keymaps/via/readme.md

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+# Basic VIA config, 9 layers.

keyboards/handwired/lemonpad/keymaps/via/rules.mk

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+VIA_ENABLE = yes
+LTO_ENABLE = yes

keyboards/handwired/lemonpad/lemonpad.c

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+/* Copyright 2022 dari-studios (@dari-studios)
+ *
+ * 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 "lemonpad.h"

keyboards/handwired/lemonpad/lemonpad.h

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+/* Copyright 2022 dari-studios (@dari-studios)
+ *
+ * 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"
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+
+//Top 3 on the usb port side, bottom 3 on the opposite side
+ 
+#define LAYOUT(         \
+      k00, k01, k02,    \
+      k10, k11, k12    	\
+) {                     \
+    { k00, k01, k02 },  \
+    { k10, k11, k12 },  \
+}

keyboards/handwired/lemonpad/readme.md

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+# lemonpad
+
+![lemonpad](https://i.imgur.com/hAp2Nich.jpeg)
+
+This is a QMK and VIA implementation for an atmega32u4 based adaptation of the Adafruit Lemon Keypad. By default it uses a Pro Micro, if you would like to use a different microcontroller please make sure you have the correct bootloader set. 
+
+* Keyboard Maintainer: [dari-studios](https://github.com/dari-studios)
+* Hardware Supported: atmega32u4 based boards with the Caterina bootloader
+* Hardware Availability: https://learn.adafruit.com/qtpy-lemon-mechanical-keypad-macropad
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/lemonpad:default
+
+Flashing example for this keyboard:
+
+    make handwired/lemonpad:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available

keyboards/handwired/lemonpad/rules.mk

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+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = caterina
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = yes         # Console for debug
+COMMAND_ENABLE = yes         # Commands for debug and configuration
+NKRO_ENABLE = yes            # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+
+LTO_ENABLE = yes