Added new pttbutton keyboard (#25952)

keyboards/morningstar1/pttbutton/keyboard.json

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+{
+    "manufacturer": "Sebastian Morgenstern",
+    "keyboard_name": "pttbutton",
+    "maintainer": "morningstar1",
+    "bootloader": "stm32-dfu",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "extrakey": true
+    },
+    "matrix_pins": {
+        "cols": ["B0"],
+        "rows": ["A0"]
+    },
+    "processor": "STM32F042",
+    "url": "https://github.com/morningstar1/pttbutton",
+    "usb": {
+        "device_version": "1.0.0",
+        "vid": "0x736D",
+        "pid": "0xAFFE"
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0, "y": 0}
+            ]
+        }
+    }
+}

keyboards/morningstar1/pttbutton/keymaps/default/keymap.c

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+// Copyright 2026 SEbastian Morgenstern
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT(
+        KC_F14
+    )
+};

keyboards/morningstar1/pttbutton/pttbutton.c

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+/* Copyright 2026 Sebastian Morgenstern
+ *
+ * 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 "quantum.h"
+#include "hal.h"
+
+void board_init(void) {
+  // Remap PA11->PA9 and PA12->PA10 for USB
+  SYSCFG->CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP;
+}
+
+void keyboard_pre_init_kb(void) {
+    // Immediately set the LED pin as an output and set it ON
+    gpio_set_pin_output(A15);
+    gpio_write_pin_high(A15);
+
+    keyboard_pre_init_user();
+}
+
+void keyboard_post_init_kb(void) {
+    // Blink the LED so we know everything is running OK
+    // Finish with LED OFF
+    gpio_write_pin_low(A15);
+    wait_ms(100);
+    gpio_write_pin_high(A15);
+    wait_ms(100);
+    gpio_write_pin_low(A15);
+
+    keyboard_post_init_user();
+}

keyboards/morningstar1/pttbutton/readme.md

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+# pttbutton
+
+![pttbutton](https://github.com/morningstar1/PTTButton/blob/main/image/PTTButton.png?raw=true)
+
+A simple one button keyboard with a USB Hub. Primary intention is to use it as a Push To Talk (PTT) button.
+
+* Keyboard Maintainer: [Sebastian Morgenstern](https://github.com/morningstar1)
+* Hardware Supported: [PTTButton V1.0](https://github.com/morningstar1/PTTButton)
+* Hardware Availability: please contact me <sebastian.morgenstern@gmail.com>
+
+Make example for this keyboard (after setting up your build environment):
+
+    make morningstar1/pttbutton:default
+
+Flashing example for this keyboard:
+
+    make morningstar1/pttbutton: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 one way:
+
+* **Physical reset button**: Briefly press the small button on the PCB