Initial support for CSTM65 (#22513)

12 files changed, 419 insertions, 0 deletions

diff --git a/keyboards/drop/cstm65/board.h b/keyboards/drop/cstm65/board.h
new file mode 100644
index 0000000000..ed3ea4b1f7
--- /dev/null
+++ b/keyboards/drop/cstm65/board.h
@@ -0,0 +1,8 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include_next <board.h>
+
+#undef STM32_HSECLK
+#define STM32_HSECLK 16000000U
diff --git a/keyboards/drop/cstm65/config.h b/keyboards/drop/cstm65/config.h
new file mode 100644
index 0000000000..302fc1677f
--- /dev/null
+++ b/keyboards/drop/cstm65/config.h
@@ -0,0 +1,16 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define I2C1_SCL_PIN B8
+#define I2C1_SDA_PIN B9
+
+#define EXTERNAL_EEPROM_I2C_BASE_ADDRESS 0b10101000
+#define EXTERNAL_EEPROM_WP_PIN B7
+#define EEPROM_I2C_24LC256
+
+#define IS31FL3733_I2C_ADDRESS_1 IS31FL3733_I2C_ADDRESS_GND_GND
+#define IS31FL3733_I2C_ADDRESS_2 IS31FL3733_I2C_ADDRESS_VCC_VCC
+#define IS31FL3733_PWM_FREQUENCY IS31FL3733_PWM_FREQUENCY_26K7_HZ
+
+#define RGB_MATRIX_CAPS_LOCK_INDEX 30
diff --git a/keyboards/drop/cstm65/cstm65.c b/keyboards/drop/cstm65/cstm65.c
new file mode 100644
index 0000000000..ccb86f1d3e
--- /dev/null
+++ b/keyboards/drop/cstm65/cstm65.c
@@ -0,0 +1,79 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifdef RGB_MATRIX_ENABLE
+#    include "rgb_matrix.h"
+
+const is31fl3733_led_t PROGMEM g_is31fl3733_leds[RGB_MATRIX_LED_COUNT] = {
+    { 0, B_1,  A_1,  C_1  },
+    { 0, B_2,  A_2,  C_2  },
+    { 0, B_3,  A_3,  C_3  },
+    { 0, B_4,  A_4,  C_4  },
+    { 0, B_5,  A_5,  C_5  },
+    { 0, B_6,  A_6,  C_6  },
+    { 0, B_7,  A_7,  C_7  },
+    { 0, B_8,  A_8,  C_8  },
+    { 0, B_9,  A_9,  C_9  },
+    { 0, B_10, A_10, C_10 },
+    { 0, B_11, A_11, C_11 },
+    { 0, B_12, A_12, C_12 },
+    { 0, B_13, A_13, C_13 },
+    { 0, B_14, A_14, C_14 },
+    { 0, B_15, A_15, C_15 },
+
+    { 0, E_1,  D_1,  F_1  },
+    { 0, E_2,  D_2,  F_2  },
+    { 0, E_3,  D_3,  F_3  },
+    { 0, E_4,  D_4,  F_4  },
+    { 0, E_5,  D_5,  F_5  },
+    { 0, E_6,  D_6,  F_6  },
+    { 0, E_7,  D_7,  F_7  },
+    { 0, E_8,  D_8,  F_8  },
+    { 0, E_9,  D_9,  F_9  },
+    { 0, E_10, D_10, F_10 },
+    { 0, E_11, D_11, F_11 },
+    { 0, E_12, D_12, F_12 },
+    { 0, E_13, D_13, F_13 },
+    { 0, E_14, D_14, F_14 },
+    { 0, E_15, D_15, F_15 },
+
+    { 1, B_1,  A_1,  C_1  },
+    { 1, B_2,  A_2,  C_2  },
+    { 1, B_3,  A_3,  C_3  },
+    { 1, B_4,  A_4,  C_4  },
+    { 1, B_5,  A_5,  C_5  },
+    { 1, B_6,  A_6,  C_6  },
+    { 1, B_7,  A_7,  C_7  },
+    { 1, B_8,  A_8,  C_8  },
+    { 1, B_9,  A_9,  C_9  },
+    { 1, B_10, A_10, C_10 },
+    { 1, B_11, A_11, C_11 },
+    { 1, B_12, A_12, C_12 },
+    { 1, B_13, A_13, C_13 },
+    { 1, B_14, A_14, C_14 },
+
+    { 1, E_1,  D_1,  F_1  },
+    { 1, E_2,  D_2,  F_2  },
+    { 1, E_3,  D_3,  F_3  },
+    { 1, E_4,  D_4,  F_4  },
+    { 1, E_5,  D_5,  F_5  },
+    { 1, E_6,  D_6,  F_6  },
+    { 1, E_7,  D_7,  F_7  },
+    { 1, E_8,  D_8,  F_8  },
+    { 1, E_9,  D_9,  F_9  },
+    { 1, E_10, D_10, F_10 },
+    { 1, E_11, D_11, F_11 },
+    { 1, E_12, D_12, F_12 },
+    { 1, E_13, D_13, F_13 },
+    { 1, E_14, D_14, F_14 },
+
+    { 1, H_1,  G_1,  I_1  },
+    { 1, H_2,  G_2,  I_2  },
+    { 1, H_3,  G_3,  I_3  },
+    { 1, H_4,  G_4,  I_4  },
+    { 1, H_5,  G_5,  I_5  },
+    { 1, H_8,  G_8,  I_8  },
+    { 1, H_9,  G_9,  I_9  },
+    { 1, H_10, G_10, I_10  },
+    { 1, H_11, G_11, I_11  },
+};
+#endif
diff --git a/keyboards/drop/cstm65/halconf.h b/keyboards/drop/cstm65/halconf.h
new file mode 100644
index 0000000000..2677c2a654
--- /dev/null
+++ b/keyboards/drop/cstm65/halconf.h
@@ -0,0 +1,7 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define HAL_USE_I2C TRUE
+
+#include_next <halconf.h>
diff --git a/keyboards/drop/cstm65/info.json b/keyboards/drop/cstm65/info.json
new file mode 100644
index 0000000000..708649966e
--- /dev/null
+++ b/keyboards/drop/cstm65/info.json
@@ -0,0 +1,221 @@
+{
+    "keyboard_name": "CSTM65",
+    "manufacturer": "Drop Inc.",
+    "maintainer": "zvecr",
+    "processor": "STM32F303",
+    "bootloader": "tinyuf2",
+    "diode_direction": "COL2ROW",
+    "matrix_pins": {
+        "cols": ["C15", "C14", "C13", "C12", "C11", "C10", "C9", "C8", "C7", "C6", "C5", "C4", "C3", "C2", "C1"],
+        "rows": ["B15", "B14", "B13", "B12", "B11"]
+    },
+    "usb": {
+        "vid": "0x359B",
+        "pid": "0x0010",
+        "device_version": "1.0.0"
+    },
+    "eeprom": {
+        "driver": "i2c"
+    },
+    "features": {
+        "rgb_matrix": true,
+        "bootmagic": true,
+        "command": false,
+        "console": false,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "community_layouts": ["65_ansi_blocker"],
+    "layouts": {
+        "LAYOUT_65_ansi_blocker": {
+            "layout": [
+                {"matrix": [0,  0], "label":"ESCAPE", "x":0, "y":0},
+                {"matrix": [0,  1], "label":"1", "x":1, "y":0},
+                {"matrix": [0,  2], "label":"2", "x":2, "y":0},
+                {"matrix": [0,  3], "label":"3", "x":3, "y":0},
+                {"matrix": [0,  4], "label":"4", "x":4, "y":0},
+                {"matrix": [0,  5], "label":"5", "x":5, "y":0},
+                {"matrix": [0,  6], "label":"6", "x":6, "y":0},
+                {"matrix": [0,  7], "label":"7", "x":7, "y":0},
+                {"matrix": [0,  8], "label":"8", "x":8, "y":0},
+                {"matrix": [0,  9], "label":"9", "x":9, "y":0},
+                {"matrix": [0, 10], "label":"0", "x":10, "y":0},
+                {"matrix": [0, 11], "label":"MINUS", "x":11, "y":0},
+                {"matrix": [0, 12], "label":"EQUALS", "x":12, "y":0},
+                {"matrix": [0, 13], "label":"BACKSPACE", "x":13, "y":0, "w":2},
+                {"matrix": [0, 14], "label":"DELETE", "x":15, "y":0},
+                {"matrix": [1,  0], "label":"TAB", "x":0, "y":1, "w":1.5},
+                {"matrix": [1,  1], "label":"Q", "x":1.5, "y":1},
+                {"matrix": [1,  2], "label":"W", "x":2.5, "y":1},
+                {"matrix": [1,  3], "label":"E", "x":3.5, "y":1},
+                {"matrix": [1,  4], "label":"R", "x":4.5, "y":1},
+                {"matrix": [1,  5], "label":"T", "x":5.5, "y":1},
+                {"matrix": [1,  6], "label":"Y", "x":6.5, "y":1},
+                {"matrix": [1,  7], "label":"U", "x":7.5, "y":1},
+                {"matrix": [1,  8], "label":"I", "x":8.5, "y":1},
+                {"matrix": [1,  9], "label":"O", "x":9.5, "y":1},
+                {"matrix": [1, 10], "label":"P", "x":10.5, "y":1},
+                {"matrix": [1, 11], "label":"LEFT BRACKET", "x":11.5, "y":1},
+                {"matrix": [1, 12], "label":"RIGHT BRACKET", "x":12.5, "y":1},
+                {"matrix": [1, 13], "label":"BACK SLASH", "x":13.5, "y":1, "w":1.5},
+                {"matrix": [1, 14], "label":"HOME", "x":15, "y":1},
+                {"matrix": [2,  0], "label":"CAPS LOCK", "x":0, "y":2, "w":1.75},
+                {"matrix": [2,  1], "label":"A", "x":1.75, "y":2},
+                {"matrix": [2,  2], "label":"S", "x":2.75, "y":2},
+                {"matrix": [2,  3], "label":"D", "x":3.75, "y":2},
+                {"matrix": [2,  4], "label":"F", "x":4.75, "y":2},
+                {"matrix": [2,  5], "label":"G", "x":5.75, "y":2},
+                {"matrix": [2,  6], "label":"H", "x":6.75, "y":2},
+                {"matrix": [2,  7], "label":"J", "x":7.75, "y":2},
+                {"matrix": [2,  8], "label":"K", "x":8.75, "y":2},
+                {"matrix": [2,  9], "label":"L", "x":9.75, "y":2},
+                {"matrix": [2, 10], "label":"SEMICOLON", "x":10.75, "y":2},
+                {"matrix": [2, 11], "label":"SINGLE TICK", "x":11.75, "y":2},
+                {"matrix": [2, 13], "label":"ENTER", "x":12.75, "y":2, "w":2.25},
+                {"matrix": [2, 14], "label":"PAGE UP", "x":15, "y":2},
+                {"matrix": [3,  0], "label":"LEFT SHIFT", "x":0, "y":3, "w":2.25},
+                {"matrix": [3,  1], "label":"Z", "x":2.25, "y":3},
+                {"matrix": [3,  2], "label":"X", "x":3.25, "y":3},
+                {"matrix": [3,  3], "label":"C", "x":4.25, "y":3},
+                {"matrix": [3,  4], "label":"V", "x":5.25, "y":3},
+                {"matrix": [3,  5], "label":"B", "x":6.25, "y":3},
+                {"matrix": [3,  6], "label":"N", "x":7.25, "y":3},
+                {"matrix": [3,  7], "label":"M", "x":8.25, "y":3},
+                {"matrix": [3,  8], "label":"COMMA", "x":9.25, "y":3},
+                {"matrix": [3,  9], "label":"PERIOD", "x":10.25, "y":3},
+                {"matrix": [3, 10], "label":"FORWARD SLASH", "x":11.25, "y":3},
+                {"matrix": [3, 12], "label":"RIGHT SHIFT", "x":12.25, "y":3, "w":1.75},
+                {"matrix": [3, 13], "label":"UP ARROW", "x":14, "y":3},
+                {"matrix": [3, 14], "label":"PAGE DOWN", "x":15, "y":3},
+                {"matrix": [4,  0], "label":"LEFT CTRL", "x":0, "y":4, "w":1.25},
+                {"matrix": [4,  1], "label":"LEFT WIN", "x":1.25, "y":4, "w":1.25},
+                {"matrix": [4,  2], "label":"LEFT ALT", "x":2.5, "y":4, "w":1.25},
+                {"matrix": [4,  6], "label":"SPACEBAR", "x":3.75, "y":4, "w":6.25},
+                {"matrix": [4, 10], "label":"RIGHT ALT", "x":10, "y":4, "w":1.25},
+                {"matrix": [4, 11], "label":"FN", "x":11.25, "y":4, "w":1.25},
+                {"matrix": [4, 12], "label":"LEFT ARROW", "x":13, "y":4},
+                {"matrix": [4, 13], "label":"DOWN ARROW", "x":14, "y":4},
+                {"matrix": [4, 14], "label":"RIGHT ARROW", "x":15, "y":4}
+            ]
+        }
+    },
+    "rgb_matrix": {
+        "driver": "is31fl3733",
+        "sleep": true,
+        "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,
+            "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
+        },
+        "layout": [
+            { "flags": 4, "matrix": [0, 0], "x": 8, "y": 7 },
+            { "flags": 4, "matrix": [0, 1], "x": 22, "y": 7 },
+            { "flags": 4, "matrix": [0, 2], "x": 35, "y": 7 },
+            { "flags": 4, "matrix": [0, 3], "x": 49, "y": 7 },
+            { "flags": 4, "matrix": [0, 4], "x": 63, "y": 7 },
+            { "flags": 4, "matrix": [0, 5], "x": 77, "y": 7 },
+            { "flags": 4, "matrix": [0, 6], "x": 91, "y": 7 },
+            { "flags": 4, "matrix": [0, 7], "x": 105, "y": 7 },
+            { "flags": 4, "matrix": [0, 8], "x": 118, "y": 7 },
+            { "flags": 4, "matrix": [0, 9], "x": 132, "y": 7 },
+            { "flags": 4, "matrix": [0, 10], "x": 146, "y": 7 },
+            { "flags": 4, "matrix": [0, 11], "x": 160, "y": 7 },
+            { "flags": 4, "matrix": [0, 12], "x": 174, "y": 7 },
+            { "flags": 4, "matrix": [0, 13], "x": 195, "y": 7 },
+            { "flags": 4, "matrix": [0, 14], "x": 215, "y": 7 },
+            { "flags": 4, "matrix": [1, 0], "x": 11, "y": 19 },
+            { "flags": 4, "matrix": [1, 1], "x": 28, "y": 19 },
+            { "flags": 4, "matrix": [1, 2], "x": 42, "y": 19 },
+            { "flags": 4, "matrix": [1, 3], "x": 56, "y": 19 },
+            { "flags": 4, "matrix": [1, 4], "x": 70, "y": 19 },
+            { "flags": 4, "matrix": [1, 5], "x": 84, "y": 19 },
+            { "flags": 4, "matrix": [1, 6], "x": 98, "y": 19 },
+            { "flags": 4, "matrix": [1, 7], "x": 112, "y": 19 },
+            { "flags": 4, "matrix": [1, 8], "x": 125, "y": 19 },
+            { "flags": 4, "matrix": [1, 9], "x": 139, "y": 19 },
+            { "flags": 4, "matrix": [1, 10], "x": 153, "y": 19 },
+            { "flags": 4, "matrix": [1, 11], "x": 167, "y": 19 },
+            { "flags": 4, "matrix": [1, 12], "x": 181, "y": 19 },
+            { "flags": 4, "matrix": [1, 13], "x": 198, "y": 19 },
+            { "flags": 4, "matrix": [1, 14], "x": 215, "y": 19 },
+            { "flags": 4, "matrix": [2, 0], "x": 13, "y": 32 },
+            { "flags": 4, "matrix": [2, 1], "x": 32, "y": 32 },
+            { "flags": 4, "matrix": [2, 2], "x": 46, "y": 32 },
+            { "flags": 4, "matrix": [2, 3], "x": 60, "y": 32 },
+            { "flags": 4, "matrix": [2, 4], "x": 73, "y": 32 },
+            { "flags": 4, "matrix": [2, 5], "x": 87, "y": 32 },
+            { "flags": 4, "matrix": [2, 6], "x": 101, "y": 32 },
+            { "flags": 4, "matrix": [2, 7], "x": 115, "y": 32 },
+            { "flags": 4, "matrix": [2, 8], "x": 129, "y": 32 },
+            { "flags": 4, "matrix": [2, 9], "x": 143, "y": 32 },
+            { "flags": 4, "matrix": [2, 10], "x": 156, "y": 32 },
+            { "flags": 4, "matrix": [2, 11], "x": 170, "y": 32 },
+            { "flags": 4, "matrix": [2, 13], "x": 193, "y": 32 },
+            { "flags": 4, "matrix": [2, 14], "x": 215, "y": 32 },
+            { "flags": 4, "matrix": [3, 0], "x": 16, "y": 44 },
+            { "flags": 4, "matrix": [3, 1], "x": 39, "y": 44 },
+            { "flags": 4, "matrix": [3, 2], "x": 53, "y": 44 },
+            { "flags": 4, "matrix": [3, 3], "x": 67, "y": 44 },
+            { "flags": 4, "matrix": [3, 4], "x": 80, "y": 44 },
+            { "flags": 4, "matrix": [3, 5], "x": 94, "y": 44 },
+            { "flags": 4, "matrix": [3, 6], "x": 108, "y": 44 },
+            { "flags": 4, "matrix": [3, 7], "x": 122, "y": 44 },
+            { "flags": 4, "matrix": [3, 8], "x": 136, "y": 44 },
+            { "flags": 4, "matrix": [3, 9], "x": 150, "y": 44 },
+            { "flags": 4, "matrix": [3, 10], "x": 163, "y": 44 },
+            { "flags": 4, "matrix": [3, 12], "x": 182, "y": 44 },
+            { "flags": 4, "matrix": [3, 13], "x": 201, "y": 44 },
+            { "flags": 4, "matrix": [3, 14], "x": 215, "y": 44 },
+            { "flags": 4, "matrix": [4, 0], "x": 9, "y": 56 },
+            { "flags": 4, "matrix": [4, 1], "x": 27, "y": 56 },
+            { "flags": 4, "matrix": [4, 2], "x": 44, "y": 56 },
+            { "flags": 4, "matrix": [4, 6], "x": 96, "y": 56 },
+            { "flags": 4, "matrix": [4, 10], "x": 148, "y": 56 },
+            { "flags": 4, "matrix": [4, 11], "x": 165, "y": 56 },
+            { "flags": 4, "matrix": [4, 12], "x": 188, "y": 56 },
+            { "flags": 4, "matrix": [4, 13], "x": 201, "y": 56 },
+            { "flags": 4, "matrix": [4, 14], "x": 215, "y": 56 }
+        ]
+    }
+}
diff --git a/keyboards/drop/cstm65/keymaps/default/keymap.c b/keyboards/drop/cstm65/keymaps/default/keymap.c
new file mode 100644
index 0000000000..28d7232bcf
--- /dev/null
+++ b/keyboards/drop/cstm65/keymaps/default/keymap.c
@@ -0,0 +1,20 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT_65_ansi_blocker(
+        KC_ESC,  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_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_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_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_LCTL, KC_LGUI, KC_LALT,                            KC_SPC,                             KC_RALT, MO(1),   KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    [1] = LAYOUT_65_ansi_blocker(
+        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,  _______, KC_MUTE,
+        _______, RGB_TOG, RGB_VAI, RGB_SPI, RGB_HUI, RGB_SAI, _______, _______, _______, _______, KC_PSCR, KC_SCRL, KC_PAUS, _______, KC_END, 
+        _______, RGB_MOD, RGB_VAD, RGB_SPD, RGB_HUD, RGB_SAD, _______, _______, _______, _______, _______, _______,          _______, KC_VOLU,
+        _______, RGB_M_P, RGB_M_B, RGB_M_R, RGB_M_SW,QK_BOOT, NK_TOGG, _______, _______, _______, _______, _______,          KC_PGUP, KC_VOLD,
+        _______, _______, _______,                            EE_CLR,                             KC_APP,  _______, KC_HOME, KC_PGDN, KC_END
+    )
+};
diff --git a/keyboards/drop/cstm65/keymaps/via/config.h b/keyboards/drop/cstm65/keymaps/via/config.h
new file mode 100644
index 0000000000..616f8e3291
--- /dev/null
+++ b/keyboards/drop/cstm65/keymaps/via/config.h
@@ -0,0 +1,5 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define DYNAMIC_KEYMAP_LAYER_COUNT 8
diff --git a/keyboards/drop/cstm65/keymaps/via/keymap.c b/keyboards/drop/cstm65/keymaps/via/keymap.c
new file mode 100644
index 0000000000..28d7232bcf
--- /dev/null
+++ b/keyboards/drop/cstm65/keymaps/via/keymap.c
@@ -0,0 +1,20 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT_65_ansi_blocker(
+        KC_ESC,  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_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_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_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_LCTL, KC_LGUI, KC_LALT,                            KC_SPC,                             KC_RALT, MO(1),   KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    [1] = LAYOUT_65_ansi_blocker(
+        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,  _______, KC_MUTE,
+        _______, RGB_TOG, RGB_VAI, RGB_SPI, RGB_HUI, RGB_SAI, _______, _______, _______, _______, KC_PSCR, KC_SCRL, KC_PAUS, _______, KC_END, 
+        _______, RGB_MOD, RGB_VAD, RGB_SPD, RGB_HUD, RGB_SAD, _______, _______, _______, _______, _______, _______,          _______, KC_VOLU,
+        _______, RGB_M_P, RGB_M_B, RGB_M_R, RGB_M_SW,QK_BOOT, NK_TOGG, _______, _______, _______, _______, _______,          KC_PGUP, KC_VOLD,
+        _______, _______, _______,                            EE_CLR,                             KC_APP,  _______, KC_HOME, KC_PGDN, KC_END
+    )
+};
diff --git a/keyboards/drop/cstm65/keymaps/via/rules.mk b/keyboards/drop/cstm65/keymaps/via/rules.mk
new file mode 100644
index 0000000000..1e5b99807c
--- /dev/null
+++ b/keyboards/drop/cstm65/keymaps/via/rules.mk
@@ -0,0 +1 @@
+VIA_ENABLE = yes
diff --git a/keyboards/drop/cstm65/mcuconf.h b/keyboards/drop/cstm65/mcuconf.h
new file mode 100644
index 0000000000..819aa70bf7
--- /dev/null
+++ b/keyboards/drop/cstm65/mcuconf.h
@@ -0,0 +1,14 @@
+// Copyright 2023 Massdrop, Inc.
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include_next <mcuconf.h>
+
+#undef STM32_PLLM_VALUE
+#define STM32_PLLM_VALUE 16
+
+#undef STM32_PREDIV_VALUE
+#define STM32_PREDIV_VALUE 2
+
+#undef STM32_I2C_USE_I2C1
+#define STM32_I2C_USE_I2C1 TRUE
diff --git a/keyboards/drop/cstm65/readme.md b/keyboards/drop/cstm65/readme.md
new file mode 100644
index 0000000000..9752021236
--- /dev/null
+++ b/keyboards/drop/cstm65/readme.md
@@ -0,0 +1,24 @@
+# CSTM65
+
+The CSTM65 is a 65% keyboard with customizable switch plates and weights, as well as a magnetically attached top case.
+
+* Keyboard Maintainer: [zvecr](https://github.com/zvecr)
+* Hardware Availability: [Drop CSTM65 Mechanical Keyboard](https://drop.com/buy/drop-cstm65-mechanical-keyboard)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make drop/cstm65:default
+
+Flashing example for this keyboard:
+
+    make drop/cstm65: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**: Quickly double tap the button located under the spacebar
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
diff --git a/keyboards/drop/cstm65/rules.mk b/keyboards/drop/cstm65/rules.mk
new file mode 100644
index 0000000000..cd74a0c770
--- /dev/null
+++ b/keyboards/drop/cstm65/rules.mk
@@ -0,0 +1,4 @@
+UF2_DEVICE_TYPE_ID = 0x216d9c07
+UF2CONV_ARGS = --device-type $(UF2_DEVICE_TYPE_ID)
+
+SRC += lib/common.c