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

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

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