Add Sinc LM Rev. 1 (#26134)

keyboards/keebio/sinc_lm/info.json

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+{
+    "manufacturer": "Keebio",
+    "url": "https://keeb.io",
+    "maintainer": "nooges",
+    "usb": {
+        "vid": "0xCB10"
+    },
+    "features": {
+        "bootmagic": true,
+        "console": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": false
+    },
+    "split": {
+        "enabled": true
+    },
+    "build": {
+        "lto": true
+    }
+}

keyboards/keebio/sinc_lm/keymaps/default/keymap.c

@@ -0,0 +1,23 @@
+// Copyright 2026 Keebio (@keebio)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [0] = LAYOUT(
+    KC_MUTE, RM_NEXT, KC_ESC,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_VOLD, KC_VOLU,
+    KC_F1,   KC_F2,   KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSPC, KC_DEL,
+    KC_F3,   KC_F4,   KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS, KC_HOME,
+    KC_F5,   KC_F6,   KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,          KC_ENT,  KC_PGUP,
+    KC_F7,   KC_F8,   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_UP,   KC_PGDN,
+    KC_F9,   KC_F10,  MO(1),   KC_LCTL, KC_LALT, KC_LGUI, KC_SPC,                             KC_SPC,  MO(1),   KC_RALT, KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT
+  ),
+  [1] = LAYOUT(
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    RM_HUEU, RM_HUED, KC_GRV,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  _______, _______,
+    RM_SATU, RM_SATD, RM_TOGG, RM_NEXT, KC_UP,   _______, QK_BOOT, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_END,
+    RM_VALU, RM_VALD, _______, KC_LEFT, KC_DOWN, KC_RGHT, _______, _______, _______, _______, _______, _______, _______,          _______, _______, _______,
+    RM_SPDU, RM_SPDD, _______,          _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______, _______,                            _______, _______, _______, _______, _______, _______, _______
+  )
+};

keyboards/keebio/sinc_lm/readme.md

@@ -0,0 +1,27 @@
+# Sinc LM
+
+A split 75%/TKL staggered low-profile keyboard made and sold by Keebio. [More info at Keebio](https://keeb.io).
+
+* Keyboard Maintainer: [Bakingpy/nooges](https://github.com/nooges)
+* Hardware Availability: [Keebio](https://keeb.io/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make keebio/sinc_lm/rev1:default
+
+Example of flashing this keyboard:
+
+    make keebio/sinc_lm/rev1:default:flash
+
+Handedness detection is already hardwired onto the PCB, so no need to deal with `EE_HANDS` or flashing .eep files.
+
+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 of these ways:
+
+* **Physical reset button**: Press and hold the button on the back of the PCB for at least 2 seconds and let go, or double-press the button
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
+
+A build guide for this keyboard can be found here: [Keebio Build Guides](https://docs.keeb.io)

keyboards/keebio/sinc_lm/rev1/config.h

@@ -0,0 +1,23 @@
+// Copyright 2026 Keebio (@keebio)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+/* Defines for the split keyboard setup */
+#define SERIAL_USART_DRIVER SD3         // USART 3
+#define SERIAL_USART_TX_PIN B10
+#define SERIAL_USART_RX_PIN B11
+#define SERIAL_USART_TX_PAL_MODE 7
+#define SERIAL_USART_RX_PAL_MODE 7
+#define SERIAL_USART_FULL_DUPLEX
+#define SERIAL_USART_PIN_SWAP
+
+#define USB_VBUS_PIN C6
+
+/* Defines for the RGB matrix */
+#define WS2812_PWM_DRIVER PWMD3
+#define WS2812_PWM_CHANNEL 4
+#define WS2812_PWM_PAL_MODE 10
+#define WS2812_DMA_STREAM STM32_DMA1_STREAM2
+#define WS2812_DMA_CHANNEL 2
+#define WS2812_DMAMUX_ID STM32_DMAMUX1_TIM3_UP

keyboards/keebio/sinc_lm/rev1/halconf.h

@@ -0,0 +1,10 @@
+// Copyright 2026 Keebio (@keebio)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define HAL_USE_SERIAL TRUE
+
+#define HAL_USE_PWM TRUE
+
+#include_next <halconf.h>

keyboards/keebio/sinc_lm/rev1/keyboard.json

@@ -0,0 +1,358 @@
+{
+    "manufacturer": "Keebio",
+    "keyboard_name": "Sinc LM Rev. 1",
+    "maintainer": "nooges",
+    "bootloader": "stm32-dfu",
+    "bootmagic": {
+        "matrix": [0, 2]
+    },
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true,
+        "rgb_matrix": true
+    },
+    "matrix_pins": {
+        "cols": ["B13", "B14", "B2", "F0", "C10", "B6", "C13", "C14", "C15"],
+        "rows": ["B4", "C11", "B12", "B5", "F1", "B1"]
+    },
+    "processor": "STM32G431",
+    "rgb_matrix": {
+        "animations": {
+            "alphas_mods": true,
+            "gradient_up_down": true,
+            "gradient_left_right": true,
+            "breathing": true,
+            "band_sat": true,
+            "band_val": true,
+            "band_pinwheel_sat": true,
+            "band_pinwheel_val": true,
+            "band_spiral_sat": true,
+            "band_spiral_val": true,
+            "cycle_all": true,
+            "cycle_left_right": true,
+            "cycle_up_down": true,
+            "cycle_out_in": true,
+            "cycle_out_in_dual": true,
+            "rainbow_moving_chevron": true,
+            "cycle_pinwheel": true,
+            "cycle_spiral": true,
+            "dual_beacon": true,
+            "rainbow_beacon": true,
+            "rainbow_pinwheels": true,
+            "flower_blooming": true,
+            "raindrops": true,
+            "jellybean_raindrops": true,
+            "hue_breathing": true,
+            "hue_pendulum": true,
+            "hue_wave": true,
+            "pixel_fractal": true,
+            "pixel_flow": true,
+            "pixel_rain": true,
+            "typing_heatmap": true,
+            "digital_rain": true,
+            "solid_reactive_simple": true,
+            "solid_reactive": true,
+            "solid_reactive_wide": true,
+            "solid_reactive_multiwide": true,
+            "solid_reactive_cross": true,
+            "solid_reactive_multicross": true,
+            "solid_reactive_nexus": true,
+            "solid_reactive_multinexus": true,
+            "splash": true,
+            "multisplash": true,
+            "solid_splash": true,
+            "solid_multisplash": true,
+            "starlight": true,
+            "starlight_smooth": true,
+            "starlight_dual_hue": true,
+            "starlight_dual_sat": true,
+            "riverflow": true
+        },
+        "driver": "ws2812",
+        "layout": [
+            { "matrix": [5, 2], "x": 30, "y": 4, "flags": 4 },
+            { "x": 32, "y": 10, "flags": 2 },
+            { "matrix": [5, 3], "x": 45, "y": 4, "flags": 4 },
+            { "matrix": [5, 4], "x": 58, "y": 4, "flags": 4 },
+            { "matrix": [5, 5], "x": 70, "y": 4, "flags": 4 },
+            { "x": 76, "y": 2, "flags": 2 },
+            { "matrix": [5, 6], "x": 82, "y": 4, "flags": 4 },
+            { "matrix": [5, 7], "x": 97, "y": 4, "flags": 4 },
+            { "matrix": [5, 8], "x": 109, "y": 4, "flags": 4 },
+            { "x": 103, "y": 10, "flags": 2 },
+
+            { "matrix": [0, 8], "x": 103, "y": 18, "flags": 4 },
+            { "matrix": [0, 7], "x": 91, "y": 18, "flags": 4 },
+            { "matrix": [0, 6], "x": 79, "y": 18, "flags": 4 },
+            { "matrix": [0, 5], "x": 67, "y": 18, "flags": 4 },
+            { "matrix": [0, 4], "x": 54, "y": 18, "flags": 4 },
+            { "matrix": [0, 3], "x": 42, "y": 18, "flags": 4 },
+            { "matrix": [0, 2], "x": 30, "y": 18, "flags": 4 },
+
+            { "matrix": [1, 2], "x": 33, "y": 30, "flags": 4 },
+            { "matrix": [1, 3], "x": 48, "y": 30, "flags": 4 },
+            { "matrix": [1, 4], "x": 61, "y": 30, "flags": 4 },
+            { "matrix": [1, 5], "x": 73, "y": 30, "flags": 4 },
+            { "matrix": [1, 6], "x": 85, "y": 30, "flags": 4 },
+            { "matrix": [1, 7], "x": 97, "y": 30, "flags": 4 },
+
+            { "matrix": [2, 7], "x": 100, "y": 41, "flags": 4 },
+            { "matrix": [2, 6], "x": 88, "y": 41, "flags": 4 },
+            { "matrix": [2, 5], "x": 76, "y": 41, "flags": 4 },
+            { "matrix": [2, 4], "x": 64, "y": 41, "flags": 4 },
+            { "matrix": [2, 3], "x": 51, "y": 41, "flags": 4 },
+            { "matrix": [2, 2], "x": 35, "y": 41, "flags": 4 },
+
+            { "matrix": [3, 2], "x": 38, "y": 53, "flags": 4 },
+            { "matrix": [3, 4], "x": 58, "y": 53, "flags": 4 },
+            { "matrix": [3, 5], "x": 70, "y": 53, "flags": 4 },
+            { "matrix": [3, 6], "x": 82, "y": 53, "flags": 4 },
+            { "matrix": [3, 7], "x": 94, "y": 53, "flags": 4 },
+            { "x": 100, "y": 46, "flags": 2 },
+            { "matrix": [3, 8], "x": 106, "y": 53, "flags": 4 },
+
+            { "matrix": [4, 7], "x": 98, "y": 64, "flags": 4 },
+            { "x": 85, "y": 64, "flags": 2 },
+            { "matrix": [4, 5], "x": 77, "y": 64, "flags": 4 },
+            { "matrix": [4, 4], "x": 62, "y": 64, "flags": 4 },
+            { "matrix": [4, 3], "x": 47, "y": 64, "flags": 4 },
+            { "x": 39, "y": 60, "flags": 4 },
+            { "matrix": [4, 2], "x": 32, "y": 64, "flags": 4 },
+
+            { "matrix": [4, 1], "x": 12, "y": 64, "flags": 4 },
+            { "x": 6, "y": 60, "flags": 2 },
+            { "matrix": [4, 0], "x": 0, "y": 64, "flags": 4 },
+            { "matrix": [3, 0], "x": 0, "y": 53, "flags": 4 },
+            { "matrix": [3, 1], "x": 12, "y": 53, "flags": 4 },
+            { "matrix": [2, 1], "x": 12, "y": 41, "flags": 4 },
+            { "matrix": [2, 0], "x": 0, "y": 41, "flags": 4 },
+            { "matrix": [1, 0], "x": 0, "y": 30, "flags": 4 },
+            { "matrix": [1, 1], "x": 12, "y": 30, "flags": 4 },
+            { "matrix": [0, 1], "x": 12, "y": 18, "flags": 4 },
+            { "matrix": [0, 0], "x": 0, "y": 18, "flags": 4 },
+            { "matrix": [5, 0], "x": 0, "y": 4, "flags": 4 },
+            { "x": 6, "y": 2, "flags": 2 },
+            { "matrix": [5, 1], "x": 12, "y": 4, "flags": 4 },
+
+            { "x": 224, "y": 10, "flags": 2 },
+            { "matrix": [11, 8], "x": 224, "y": 4, "flags": 4 },
+            { "matrix": [11, 7], "x": 212, "y": 4, "flags": 4 },
+            { "matrix": [11, 6], "x": 197, "y": 4, "flags": 4 },
+            { "x": 191, "y": 10, "flags": 2 },
+            { "matrix": [11, 5], "x": 185, "y": 4, "flags": 4 },
+            { "matrix": [11, 4], "x": 173, "y": 4, "flags": 4 },
+            { "x": 166, "y": 10, "flags": 2 },
+            { "matrix": [11, 3], "x": 160, "y": 4, "flags": 4 },
+            { "matrix": [11, 2], "x": 145, "y": 4, "flags": 4 },
+            { "x": 139, "y": 10, "flags": 2 },
+            { "matrix": [11, 1], "x": 133, "y": 4, "flags": 4 },
+
+            { "matrix": [6, 0], "x": 127, "y": 18, "flags": 4 },
+            { "matrix": [6, 1], "x": 139, "y": 18, "flags": 4 },
+            { "matrix": [6, 2], "x": 151, "y": 18, "flags": 4 },
+            { "matrix": [6, 3], "x": 163, "y": 18, "flags": 4 },
+            { "matrix": [6, 4], "x": 176, "y": 18, "flags": 4 },
+            { "matrix": [6, 5], "x": 188, "y": 18, "flags": 4 },
+            { "matrix": [6, 7], "x": 206, "y": 18, "flags": 4 },
+            { "matrix": [6, 8], "x": 224, "y": 18, "flags": 4 },
+
+            { "matrix": [7, 8], "x": 224, "y": 30, "flags": 4 },
+            { "matrix": [7, 7], "x": 209, "y": 30, "flags": 4 },
+            { "matrix": [7, 6], "x": 194, "y": 30, "flags": 4 },
+            { "matrix": [7, 5], "x": 182, "y": 30, "flags": 4 },
+            { "matrix": [7, 4], "x": 170, "y": 30, "flags": 4 },
+            { "matrix": [7, 3], "x": 157, "y": 30, "flags": 4 },
+            { "matrix": [7, 2], "x": 145, "y": 30, "flags": 4 },
+            { "matrix": [7, 1], "x": 133, "y": 30, "flags": 4 },
+            { "matrix": [7, 0], "x": 121, "y": 30, "flags": 4 },
+
+            { "matrix": [8, 0], "x": 124, "y": 41, "flags": 4 },
+            { "matrix": [8, 1], "x": 136, "y": 41, "flags": 4 },
+            { "matrix": [8, 2], "x": 148, "y": 41, "flags": 4 },
+            { "matrix": [8, 3], "x": 160, "y": 41, "flags": 4 },
+            { "matrix": [8, 4], "x": 173, "y": 41, "flags": 4 },
+            { "matrix": [8, 5], "x": 185, "y": 41, "flags": 4 },
+            { "matrix": [8, 7], "x": 204, "y": 41, "flags": 4 },
+            { "matrix": [8, 8], "x": 224, "y": 41, "flags": 4 },
+
+            { "matrix": [9, 8], "x": 224, "y": 53, "flags": 4 },
+            { "matrix": [9, 7], "x": 212, "y": 53, "flags": 4 },
+            { "matrix": [9, 6], "x": 195, "y": 53, "flags": 4 },
+            { "matrix": [9, 4], "x": 179, "y": 53, "flags": 4 },
+            { "matrix": [9, 3], "x": 166, "y": 53, "flags": 4 },
+            { "matrix": [9, 2], "x": 154, "y": 53, "flags": 4 },
+            { "matrix": [9, 1], "x": 142, "y": 53, "flags": 4 },
+            { "matrix": [9, 0], "x": 130, "y": 53, "flags": 4 },
+
+            { "x": 127, "y": 64, "flags": 2 },
+            { "matrix": [10, 1], "x": 141, "y": 64, "flags": 4 },
+            { "x": 157, "y": 64, "flags": 2 },
+            { "matrix": [10, 2], "x": 163, "y": 64, "flags": 4 },
+            { "matrix": [10, 3], "x": 176, "y": 64, "flags": 4 },
+            { "matrix": [10, 4], "x": 188, "y": 64, "flags": 4 },
+            { "x": 194, "y": 64, "flags": 2 },
+            { "matrix": [10, 6], "x": 200, "y": 64, "flags": 4 },
+            { "matrix": [10, 7], "x": 212, "y": 64, "flags": 4 },
+            { "x": 218, "y": 64, "flags": 2 },
+            { "matrix": [10, 8], "x": 224, "y": 64, "flags": 4 }
+        ],
+        "max_brightness": 120,
+        "sleep": true,
+        "split_count": [57, 56]
+    },
+    "split": {
+        "bootmagic": {
+            "matrix": [11, 8]
+        },
+        "enabled": true,
+        "handedness": {
+            "pin": "A0"
+        },
+
+        "matrix_pins": {
+            "right": {
+                "cols": ["B2", "A15", "A2", "A1", "A4", "B15", "B6", "C13", "C14"],
+                "rows": ["B12", "B13", "B14", "B5", "F1", "B1"]
+            }
+        },
+        "serial": {
+            "driver": "usart"
+        },
+        "transport": {
+            "sync": {
+                "matrix_state": true
+            }
+        }
+    },
+    "url": "https://keeb.io",
+    "usb": {
+        "device_version": "1.0.0",
+        "pid": "0x1667",
+        "vid": "0xCB10"
+    },
+    "ws2812": {
+        "driver": "pwm",
+        "pin": "B7"
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"label": "Mute", "matrix": [5, 0], "x": 0, "y": 0},
+                {"label": "Play", "matrix": [5, 1], "x": 1, "y": 0},
+                {"label": "Esc", "matrix": [5, 2], "x": 2.25, "y": 0},
+                {"label": "F1", "matrix": [5, 3], "x": 3.5, "y": 0},
+                {"label": "F2", "matrix": [5, 4], "x": 4.5, "y": 0},
+                {"label": "F3", "matrix": [5, 5], "x": 5.5, "y": 0},
+                {"label": "F4", "matrix": [5, 6], "x": 6.5, "y": 0},
+                {"label": "F5", "matrix": [5, 7], "x": 7.75, "y": 0},
+                {"label": "F6", "matrix": [5, 8], "x": 8.75, "y": 0},
+
+                {"label": "F7", "matrix": [11, 1], "x": 10.75, "y": 0},
+                {"label": "F8", "matrix": [11, 2], "x": 11.75, "y": 0},
+                {"label": "F9", "matrix": [11, 3], "x": 13, "y": 0},
+                {"label": "F10", "matrix": [11, 4], "x": 14, "y": 0},
+                {"label": "F11", "matrix": [11, 5], "x": 15, "y": 0},
+                {"label": "F12", "matrix": [11, 6], "x": 16, "y": 0},
+                {"label": "Volume Up", "matrix": [11, 7], "x": 17.25, "y": 0},
+                {"label": "Volume Down", "matrix": [11, 8], "x": 18.25, "y": 0},
+
+                {"label": "F1", "matrix": [0, 0], "x": 0, "y": 1.25},
+                {"label": "F2", "matrix": [0, 1], "x": 1, "y": 1.25},
+
+                {"label": "Grave", "matrix": [0, 2], "x": 2.25, "y": 1.25},
+                {"label": "1", "matrix": [0, 3], "x": 3.25, "y": 1.25},
+                {"label": "2", "matrix": [0, 4], "x": 4.25, "y": 1.25},
+                {"label": "3", "matrix": [0, 5], "x": 5.25, "y": 1.25},
+                {"label": "4", "matrix": [0, 6], "x": 6.25, "y": 1.25},
+                {"label": "5", "matrix": [0, 7], "x": 7.25, "y": 1.25},
+                {"label": "6", "matrix": [0, 8], "x": 8.25, "y": 1.25},
+
+                {"label": "7", "matrix": [6, 0], "x": 10.25, "y": 1.25},
+                {"label": "8", "matrix": [6, 1], "x": 11.25, "y": 1.25},
+                {"label": "9", "matrix": [6, 2], "x": 12.25, "y": 1.25},
+                {"label": "0", "matrix": [6, 3], "x": 13.25, "y": 1.25},
+                {"label": "-", "matrix": [6, 4], "x": 14.25, "y": 1.25},
+                {"label": "=", "matrix": [6, 5], "x": 15.25, "y": 1.25},
+                {"label": "Bksp", "matrix": [6, 7], "x": 16.25, "y": 1.25, "w": 2},
+                {"label": "Del", "matrix": [6, 8], "x": 18.25, "y": 1.25},
+
+                {"label": "F3", "matrix": [1, 0], "x": 0, "y": 2.25},
+                {"label": "F4", "matrix": [1, 1], "x": 1, "y": 2.25},
+
+                {"label": "Tab", "matrix": [1, 2], "x": 2.25, "y": 2.25, "w": 1.5},
+                {"label": "Q", "matrix": [1, 3], "x": 3.75, "y": 2.25},
+                {"label": "W", "matrix": [1, 4], "x": 4.75, "y": 2.25},
+                {"label": "E", "matrix": [1, 5], "x": 5.75, "y": 2.25},
+                {"label": "R", "matrix": [1, 6], "x": 6.75, "y": 2.25},
+                {"label": "T", "matrix": [1, 7], "x": 7.75, "y": 2.25},
+
+                {"label": "Y", "matrix": [7, 0], "x": 9.75, "y": 2.25},
+                {"label": "U", "matrix": [7, 1], "x": 10.75, "y": 2.25},
+                {"label": "I", "matrix": [7, 2], "x": 11.75, "y": 2.25},
+                {"label": "O", "matrix": [7, 3], "x": 12.75, "y": 2.25},
+                {"label": "P", "matrix": [7, 4], "x": 13.75, "y": 2.25},
+                {"label": "{", "matrix": [7, 5], "x": 14.75, "y": 2.25},
+                {"label": "}", "matrix": [7, 6], "x": 15.75, "y": 2.25},
+                {"label": "|", "matrix": [7, 7], "x": 16.75, "y": 2.25, "w": 1.5},
+                {"label": "Home", "matrix": [7, 8], "x": 18.25, "y": 2.25},
+
+                {"label": "F5", "matrix": [2, 0], "x": 0, "y": 3.25},
+                {"label": "F6", "matrix": [2, 1], "x": 1, "y": 3.25},
+
+                {"label": "Caps Lock", "matrix": [2, 2], "x": 2.25, "y": 3.25, "w": 1.75},
+                {"label": "A", "matrix": [2, 3], "x": 4, "y": 3.25},
+                {"label": "S", "matrix": [2, 4], "x": 5, "y": 3.25},
+                {"label": "D", "matrix": [2, 5], "x": 6, "y": 3.25},
+                {"label": "F", "matrix": [2, 6], "x": 7, "y": 3.25},
+                {"label": "G", "matrix": [2, 7], "x": 8, "y": 3.25},
+
+                {"label": "H", "matrix": [8, 0], "x": 10, "y": 3.25},
+                {"label": "J", "matrix": [8, 1], "x": 11, "y": 3.25},
+                {"label": "K", "matrix": [8, 2], "x": 12, "y": 3.25},
+                {"label": "L", "matrix": [8, 3], "x": 13, "y": 3.25},
+                {"label": ":", "matrix": [8, 4], "x": 14, "y": 3.25},
+                {"label": "\"", "matrix": [8, 5], "x": 15, "y": 3.25},
+                {"label": "Enter", "matrix": [8, 7], "x": 16, "y": 3.25, "w": 2.25},
+                {"label": "PgUp", "matrix": [8, 8], "x": 18.25, "y": 3.25},
+
+                {"label": "F7", "matrix": [3, 0], "x": 0, "y": 4.25},
+                {"label": "F8", "matrix": [3, 1], "x": 1, "y": 4.25},
+
+                {"label": "Shift", "matrix": [3, 2], "x": 2.25, "y": 4.25, "w": 2.25},
+                {"label": "Z", "matrix": [3, 4], "x": 4.5, "y": 4.25},
+                {"label": "X", "matrix": [3, 5], "x": 5.5, "y": 4.25},
+                {"label": "C", "matrix": [3, 6], "x": 6.5, "y": 4.25},
+                {"label": "V", "matrix": [3, 7], "x": 7.5, "y": 4.25},
+                {"label": "B", "matrix": [3, 8], "x": 8.5, "y": 4.25},
+
+                {"label": "N", "matrix": [9, 0], "x": 10.5, "y": 4.25},
+                {"label": "M", "matrix": [9, 1], "x": 11.5, "y": 4.25},
+                {"label": ",", "matrix": [9, 2], "x": 12.5, "y": 4.25},
+                {"label": ".", "matrix": [9, 3], "x": 13.5, "y": 4.25},
+                {"label": "/", "matrix": [9, 4], "x": 14.5, "y": 4.25},
+                {"label": "Shift", "matrix": [9, 6], "x": 15.5, "y": 4.25, "w": 1.75},
+                {"label": "Up", "matrix": [9, 7], "x": 17.25, "y": 4.25},
+                {"label": "PgDn", "matrix": [9, 8], "x": 18.25, "y": 4.25},
+
+                {"label": "F9", "matrix": [4, 0], "x": 0, "y": 5.25},
+                {"label": "F10", "matrix": [4, 1], "x": 1, "y": 5.25},
+
+                {"label": "Fn", "matrix": [4, 2], "x": 2.25, "y": 5.25, "w": 1.25},
+                {"label": "Ctrl", "matrix": [4, 3], "x": 3.5, "y": 5.25, "w": 1.25},
+                {"label": "Alt", "matrix": [4, 4], "x": 4.75, "y": 5.25, "w": 1.25},
+                {"label": "Win", "matrix": [4, 5], "x": 6, "y": 5.25, "w": 1.25},
+                {"label": "Space", "matrix": [4, 7], "x": 7.25, "y": 5.25, "w": 2.25},
+
+                {"label": "Space", "matrix": [10, 1], "x": 10.5, "y": 5.25, "w": 2.75},
+                {"label": "Fn", "matrix": [10, 2], "x": 13.25, "y": 5.25},
+                {"label": "Alt", "matrix": [10, 3], "x": 14.25, "y": 5.25},
+                {"label": "Ctrl", "matrix": [10, 4], "x": 15.25, "y": 5.25},
+                {"label": "Left", "matrix": [10, 6], "x": 16.25, "y": 5.25},
+                {"label": "Down", "matrix": [10, 7], "x": 17.25, "y": 5.25},
+                {"label": "Right", "matrix": [10, 8], "x": 18.25, "y": 5.25}
+            ]
+        }
+    }
+}

keyboards/keebio/sinc_lm/rev1/mcuconf.h

@@ -0,0 +1,14 @@
+// Copyright 2026 Keebio (@keebio)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include_next <mcuconf.h>
+
+/* enable USART3, used for split comms */
+#undef STM32_SERIAL_USE_USART3
+#define STM32_SERIAL_USE_USART3 TRUE
+
+/* enable TIM3, used for RGB LED PWM driver */
+#undef STM32_PWM_USE_TIM3
+#define STM32_PWM_USE_TIM3 TRUE

keyboards/keebio/sinc_lm/rev1/rev1.c

@@ -0,0 +1,11 @@
+// Copyright 2026 Keebio (@keebio)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "quantum.h"
+
+void keyboard_pre_init_kb(void) {
+    // Disable the PD peripheral in pre-init because its pins are being used in the matrix:
+    PWR->CR3 |= PWR_CR3_UCPD_DBDIS;
+    // Call the corresponding _user() function (see https://docs.qmk.fm/#/custom_quantum_functions)
+    keyboard_pre_init_user();
+}