Add Palmetto PCB (qmk#21955)

keyboards/montsinger/palmetto/config.h

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+// Copyright 2023 Ross Montsinger
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED GP17
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 1000U
+#define RP2040_FLASH_GENERIC_03H

keyboards/montsinger/palmetto/keymaps/default/keymap.c

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+// Copyright 2023 Ross Montsinger
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+
+// Each layer gets a name for readability, which is then used in the keymap matrix below.
+// The underscores don't mean anything - you can have a layer called STUFF or any other name.
+// Layer names don't all need to be of the same length, obviously, and you can also skip them
+// entirely and just use numbers.
+enum layer_names {
+    _BASE,
+    _FN1
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [_BASE] = LAYOUT_60_ansi(
+    QK_GESC, 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_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_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_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N, KC_M,    KC_COMM, KC_DOT,  KC_SLSH,                    KC_RSFT,
+    KC_LCTL, KC_LGUI, KC_LALT, KC_SPC,                                                     KC_RALT, KC_RGUI, MO(_FN1), KC_RCTL
+  ),
+
+  [_FN1] = LAYOUT_60_ansi(
+    QK_GESC, 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_DEL,
+    RGB_TOG, RGB_MOD, KC_UP,   _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    BL_BRTG, KC_LEFT, KC_DOWN, KC_RGHT, _______, _______, _______, _______, _______, _______, _______, _______,          _______,
+    BL_UP,   BL_DOWN, BL_TOGG, _______, _______, _______, _______, _______, _______, _______, _______,                   _______,
+    KC_GRV,  _______, _______, _______,                                                       _______, _______, _______, QK_BOOT
+  )
+};

keyboards/montsinger/palmetto/keymaps/via/keymap.c

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+// Copyright 2023 Ross Montsinger
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+
+// Each layer gets a name for readability, which is then used in the keymap matrix below.
+// The underscores don't mean anything - you can have a layer called STUFF or any other name.
+// Layer names don't all need to be of the same length, obviously, and you can also skip them
+// entirely and just use numbers.
+enum layer_names {
+    _BASE,
+    _FN1
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [_BASE] = LAYOUT_60_ansi(
+    QK_GESC, 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_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_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_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N, KC_M,    KC_COMM, KC_DOT,  KC_SLSH,                    KC_RSFT,
+    KC_LCTL, KC_LGUI, KC_LALT, KC_SPC,                                                     KC_RALT, KC_RGUI, MO(_FN1), KC_RCTL
+  ),
+
+  [_FN1] = LAYOUT_60_ansi(
+    QK_GESC, 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_DEL,
+    RGB_TOG, RGB_MOD, KC_UP,   _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    BL_BRTG, KC_LEFT, KC_DOWN, KC_RGHT, _______, _______, _______, _______, _______, _______, _______, _______,          _______,
+    BL_UP,   BL_DOWN, BL_TOGG, _______, _______, _______, _______, _______, _______, _______, _______,                   _______,
+    KC_GRV,  _______, _______, _______,                                                       _______, _______, _______, QK_BOOT
+  )
+};

keyboards/montsinger/palmetto/keymaps/via/rules.mk

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+VIA_ENABLE = yes

keyboards/montsinger/palmetto/readme.md

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+# Palmetto PCB
+
+Palmetto PCB from Montsinger (https://i.imgur.com/VmmAW97.jpeg)
+
+* Keyboard Maintainer: [Ross Montsinger](https://github.com/rossman360)
+* Hardware Supported: RP2040
+* Hardware Availability: [Carolina Mech](https://carolinamech.com)
+
+
+Make example for this keyboard (after setting up your build environment):
+
+    make montsinger/palmetto:default
+
+Flashing example for this keyboard:
+
+    make montsinger/palmetto: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**: Hold the "BOOTMODE" button on the back of the PCB and briefly press the "RESET" button on the back of the PCB
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available

keyboards/montsinger/palmetto/rules.mk

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+