[Keyboard] Add handwired BDN9-BLE (#8192)

* Add handwired BDN9-BLE

* Apply suggestions from code review

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Update keyboards/handwired/bdn9_ble/rules.mk

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Update keyboards/handwired/bdn9_ble/rules.mk

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Update keyboards/handwired/bdn9_ble/readme.md

Co-Authored-By: James Young <18669334+noroadsleft@users.noreply.github.com>

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

keyboards/handwired/bdn9_ble/bdn9_ble.c

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+#include "bdn9_ble.h"

keyboards/handwired/bdn9_ble/bdn9_ble.h

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+/* Copyright 2019 Danny Nguyen <danny@keeb.io>
+ *
+ * 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 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.
+ */
+#define LAYOUT( \
+    KA1, KA2, KA3, \
+    KB1, KB2, KB3, \
+    KC1, KC2, KC3 \
+) \
+{ \
+    { KA1, KA2, KA3 }, \
+    { KB1, KB2, KB3 }, \
+    { KC1, KC2, KC3 } \
+}

keyboards/handwired/bdn9_ble/config.h

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+/*
+Copyright 2019 Danny Nguyen <danny@keeb.io>
+
+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       0xCB10
+#define PRODUCT_ID      0x1134
+#define DEVICE_VER      0x0100
+#define MANUFACTURER    KeyPCB/Keebio
+#define PRODUCT         BDN9-BLE
+#define DESCRIPTION     3x3 Bluetooth Macropad
+
+/* key matrix size */
+#define MATRIX_ROWS 3
+#define MATRIX_COLS 3
+
+/* Keyboard Matrix Assignments */
+#define DIRECT_PINS { \
+    { D1, D0, C6 }, \
+    { D7, B5, B6 }, \
+    { B7, D6, F7 } \
+}
+
+#define BACKLIGHT_PIN F6
+// #define BACKLIGHT_BREATHING
+#define BACKLIGHT_LEVELS 5
+#define BACKLIGHT_ON_STATE 1
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* 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

keyboards/handwired/bdn9_ble/info.json

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+{
+  "keyboard_name": "KeyPCB/Keeb.io BDN9-BLE",
+  "url": "",
+  "maintainer": "merlin04",
+  "width": 3,
+  "height": 3,
+  "layouts": {
+    "LAYOUT": {
+      "layout": [
+        {"x":0, "y":0},
+        {"x":1, "y":0},
+        {"x":2, "y":0},
+        {"x":0, "y":1},
+        {"x":1, "y":1},
+        {"x":2, "y":1},
+        {"x":0, "y":2},
+        {"x":1, "y":2},
+        {"x":2, "y":2}
+      ]
+    }
+  }
+}

keyboards/handwired/bdn9_ble/keymaps/default/keymap.c

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+/* Copyright 2019 Danny Nguyen <danny@keeb.io>
+ *
+ * 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
+
+
+// Enable test mode, which sets the keys to letters A-I.
+//#define TESTMODE
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    #ifndef TESTMODE
+    // MEH - hold down ctrl, alt, shift, and press key
+    [0] = LAYOUT(
+        MEH(KC_1), MEH(KC_2), MEH(KC_3),
+        MEH(KC_4), MEH(KC_5), MEH(KC_6),
+        MEH(KC_7), MEH(KC_8), LT(1, MEH(KC_9))
+    ),
+    #else
+    [0] = LAYOUT(
+        KC_A, KC_B, KC_C,
+        KC_D, KC_E, KC_F,
+        KC_G, KC_H, KC_I
+    ),
+    #endif
+    /*
+     * ------------------------------------------------------------------------
+     * |                | Automatic BLE output detection | Reset               |
+     * | Backlight Step | Use USB port for output        |                     |
+     * | Backlight Tgl  | Use Bluetooth for output       | (currently pressed) |
+     * ------------------------------------------------------------------------
+     */
+    [1] = LAYOUT(
+        _______, OUT_AUTO, RESET,
+        BL_STEP, OUT_USB, _______,
+        BL_TOGG, OUT_BT,  _______
+    )
+};

keyboards/handwired/bdn9_ble/readme.md

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+# BDN9-BLE
+
+![BDN9](https://cdn.shopify.com/s/files/1/1851/5125/products/image_bd8d9423-950e-4aad-bea5-665d896f879a_530x@2x.jpg?v=1547909493)
+
+A handwired modified version of the Keebio BDN9 macropad to support BLE through the Adafruit Feather 32u4 Bluefruit LE.
+
+* Keyboard Maintainer: [merlin04/KeyPCB](https://github.com/merlin04)
+* Hardware Supported: Adafruit Feather 32u4 Bluefruit LE
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/bdn9_ble:default
+
+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).

keyboards/handwired/bdn9_ble/rules.mk

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+# MCU name
+MCU = atmega32u4
+
+# Processor frequency
+F_CPU = 8000000
+
+# Bootloader selection
+#   Teensy       halfkay
+#   Pro Micro    caterina
+#   Atmel DFU    atmel-dfu
+#   LUFA DFU     lufa-dfu
+#   QMK DFU      qmk-dfu
+#   ATmega32A    bootloadHID
+#   ATmega328P   USBasp
+BOOTLOADER = caterina
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no      # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = yes        # Console for debug
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = yes       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no       # Enable keyboard RGB underglow
+MIDI_ENABLE = no            # MIDI support
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH = AdafruitBLE       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output on port C6
+FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
+HD44780_ENABLE = no 		# Enable support for HD44780 based LCDs
+ENCODER_ENABLE = no