[Keyboard] Add Kaly42 (#22282)

* Added Kaly/Kaly42 keyboard's minimal files.

* Updated readme.md; New link and improved description text.

* Apply suggestions from code review

Added all suggestions given by @dunk2k

Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>

* Added community_layouts to info.json.

Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>

---------

Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>

7 files changed, 174 insertions, 0 deletions

diff --git a/keyboards/kaly/kaly42/config.h b/keyboards/kaly/kaly42/config.h
new file mode 100644
index 0000000000..e97f0a8aa4
--- /dev/null
+++ b/keyboards/kaly/kaly42/config.h
@@ -0,0 +1,9 @@
+// Copyright 2023 Kael Soares Augusto (@Dwctor)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define SERIAL_USART_FULL_DUPLEX   // Enable full duplex operation mode.
+
+#define SERIAL_USART_TX_PIN B6     // USART TX pin
+#define SERIAL_USART_RX_PIN B7     // USART RX pin
diff --git a/keyboards/kaly/kaly42/halconf.h b/keyboards/kaly/kaly42/halconf.h
new file mode 100644
index 0000000000..7cbbf59610
--- /dev/null
+++ b/keyboards/kaly/kaly42/halconf.h
@@ -0,0 +1,7 @@
+// Copyright 2023 Kael Soares Augusto (@Dwctor)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define HAL_USE_SERIAL TRUE
+#include_next <halconf.h>
diff --git a/keyboards/kaly/kaly42/info.json b/keyboards/kaly/kaly42/info.json
new file mode 100644
index 0000000000..38de4ccea5
--- /dev/null
+++ b/keyboards/kaly/kaly42/info.json
@@ -0,0 +1,93 @@
+{
+    "manufacturer": "Dwctor",
+    "keyboard_name": "kaly/kaly42",
+    "maintainer": "Dwctor",
+    "development_board": "blackpill_f401",
+    "features": {
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "direct": [
+            ["B1", "B10", "A8", "B15", "B14", "B13"],
+            ["B9", "B8", "B5", "B4", "B3", "A15"],
+            ["A4", "A3", "A5", "A6", "A7", "B0"],
+            ["A2", "A1", "A0", "NO_PIN", "NO_PIN", "NO_PIN"]
+        ]
+    },
+    "split": {
+        "enabled": true,
+        "bootmagic": {
+            "matrix": [4, 5]
+        },
+        "matrix_pins": {
+            "right": {
+                "direct": [
+                    ["B13", "B14", "B15", "A8", "B10", "B1"],
+                    ["A15", "B3", "B4", "B5", "B8", "B9"],
+                    ["B0", "A7", "A6", "A5", "A3", "A4"],
+                    ["A0", "A1", "A2", "NO_PIN", "NO_PIN", "NO_PIN"]
+                ]
+            }
+        }
+    },
+    "url": "https://github.com/Dwctor/Kaly",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x0000",
+        "vid": "0xFEED"
+    },
+    "community_layouts": ["split_3x6_3"],
+    "layouts": {
+        "LAYOUT_split_3x6_3": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0, "y": 0.25},
+                {"matrix": [0, 1], "x": 1, "y": 0.25},
+                {"matrix": [0, 2], "x": 2, "y": 0.125},
+                {"matrix": [0, 3], "x": 3, "y": 0},
+                {"matrix": [0, 4], "x": 4, "y": 0.125},
+                {"matrix": [0, 5], "x": 5, "y": 0.25},
+                {"matrix": [4, 0], "x": 8, "y": 0.25},
+                {"matrix": [4, 1], "x": 9, "y": 0.125},
+                {"matrix": [4, 2], "x": 10, "y": 0},
+                {"matrix": [4, 3], "x": 11, "y": 0.125},
+                {"matrix": [4, 4], "x": 12, "y": 0.25},
+                {"matrix": [4, 5], "x": 13, "y": 0.25},
+                {"matrix": [1, 0], "x": 0, "y": 1.25},
+                {"matrix": [1, 1], "x": 1, "y": 1.25},
+                {"matrix": [1, 2], "x": 2, "y": 1.125},
+                {"matrix": [1, 3], "x": 3, "y": 1},
+                {"matrix": [1, 4], "x": 4, "y": 1.125},
+                {"matrix": [1, 5], "x": 5, "y": 1.25},
+                {"matrix": [5, 0], "x": 8, "y": 1.25},
+                {"matrix": [5, 1], "x": 9, "y": 1.125},
+                {"matrix": [5, 2], "x": 10, "y": 1},
+                {"matrix": [5, 3], "x": 11, "y": 1.125},
+                {"matrix": [5, 4], "x": 12, "y": 1.25},
+                {"matrix": [5, 5], "x": 13, "y": 1.25},
+                {"matrix": [2, 0], "x": 0, "y": 2.25},
+                {"matrix": [2, 1], "x": 1, "y": 2.25},
+                {"matrix": [2, 2], "x": 2, "y": 2.125},
+                {"matrix": [2, 3], "x": 3, "y": 2},
+                {"matrix": [2, 4], "x": 4, "y": 2.125},
+                {"matrix": [2, 5], "x": 5, "y": 2.25},
+                {"matrix": [6, 0], "x": 8, "y": 2.25},
+                {"matrix": [6, 1], "x": 9, "y": 2.125},
+                {"matrix": [6, 2], "x": 10, "y": 2},
+                {"matrix": [6, 3], "x": 11, "y": 2.125},
+                {"matrix": [6, 4], "x": 12, "y": 2.25},
+                {"matrix": [6, 5], "x": 13, "y": 2.25},
+                {"matrix": [3, 0], "x": 3.5, "y": 3.25},
+                {"matrix": [3, 1], "x": 4.5, "y": 3.5},
+                {"matrix": [3, 2], "x": 5.5, "y": 3.75},
+                {"matrix": [7, 0], "x": 7.5, "y": 3.75},
+                {"matrix": [7, 1], "x": 8.5, "y": 3.5},
+                {"matrix": [7, 2], "x": 9.5, "y": 3.25}
+            ]
+        }
+    }
+}
diff --git a/keyboards/kaly/kaly42/keymaps/default/keymap.c b/keyboards/kaly/kaly42/keymaps/default/keymap.c
new file mode 100644
index 0000000000..54d46c54db
--- /dev/null
+++ b/keyboards/kaly/kaly42/keymaps/default/keymap.c
@@ -0,0 +1,27 @@
+// Copyright 2023 Kael Soares Augusto (@Dwctor)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+     /*
+      * ┌───┬───┬───┬───┬───┬───┐       ┌───┬───┬───┬───┬───┬───┐
+      * │Tab│ Q │ W │ E │ R │ T │       │ Y │ U │ I │ O │ P │Bsp│
+      * ├───┼───┼───┼───┼───┼───┤       ├───┼───┼───┼───┼───┼───┤
+      * │Ctl│ A │ S │ D │ F │ G │       │ H │ J │ K │ L │ ; │ ' │
+      * ├───┼───┼───┼───┼───┼───┤       ├───┼───┼───┼───┼───┼───┤
+      * │Sft│ Z │ X │ C │ V │ B │       │ N │ M │ , │ . │ / │Sft│
+      * └───┴───┴───┴───┴───┴───┘       └───┴───┴───┴───┴───┴───┘
+      *               ┌───┐                   ┌───┐
+      *               │GUI├───┐           ┌───┤Alt│
+      *               └───┤Bsp├───┐   ┌───┤Ent├───┘
+      *                   └───┤   │   │   ├───┘
+      *                       └───┘   └───┘
+      */
+    [0] = LAYOUT_split_3x6_3(
+        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_LCTL, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,                               KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,
+        KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,                               KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT,
+                                            KC_LGUI, KC_BSPC, KC_SPC,           KC_SPC,  KC_ENT,  KC_RALT
+    )
+};
diff --git a/keyboards/kaly/kaly42/mcuconf.h b/keyboards/kaly/kaly42/mcuconf.h
new file mode 100644
index 0000000000..6db1e6072a
--- /dev/null
+++ b/keyboards/kaly/kaly42/mcuconf.h
@@ -0,0 +1,10 @@
+// Copyright 2023 Kael Soares Augusto (@Dwctor)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include_next <mcuconf.h>
+
+#undef STM32_SERIAL_USE_USART1
+
+#define STM32_SERIAL_USE_USART1 TRUE
diff --git a/keyboards/kaly/kaly42/readme.md b/keyboards/kaly/kaly42/readme.md
new file mode 100644
index 0000000000..d3b0ff7a3d
--- /dev/null
+++ b/keyboards/kaly/kaly42/readme.md
@@ -0,0 +1,27 @@
+# kaly/kaly42
+
+![kaly/kaly42](https://i.imgur.com/wSmUjFUh.jpeg)
+
+The Kaly is a split, ergonomic keyboard inspired by the [Ferris](https://github.com/pierrechevalier83/ferris) and the [Cantor](https://github.com/diepala/cantor) with the main goals of comfort, affordability and cuteness! The stand-out features of the Kaly is the ease-to-solder and the natural thumb cluster that allow users to confortably reach all keys of the keyboard! To see more of the Kaly, visit [this video](https://www.youtube.com/watch?v=PhxM8o__9Xo) outlining the journey of making this keybord.
+
+* Keyboard Maintainer: [Kael Soares Augusto](https://github.com/Dwctor)
+* Hardware Supported: Blackpill STM32F401
+* Hardware Availability: [https://github.com/Dwctor/Kaly](https://github.com/Dwctor/Kaly)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make kaly/kaly42:default
+
+Flashing example for this keyboard:
+
+    make kaly/kaly42: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 `QK_BOOT` if it is available
diff --git a/keyboards/kaly/kaly42/rules.mk b/keyboards/kaly/kaly42/rules.mk
new file mode 100644
index 0000000000..c6e2988321
--- /dev/null
+++ b/keyboards/kaly/kaly42/rules.mk
@@ -0,0 +1 @@
+SERIAL_DRIVER = usart