Add Keychron C2 Pro (#20701)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: adophoxia <100170946+adophoxia@users.noreply.github.com>
Co-authored-by: jack <0x6a73@protonmail.com>

keyboards/keychron/c2_pro/config.h

@@ -0,0 +1,44 @@
+/* Copyright 2023 @ Keychron(https://www.keychron.com)
+ *
+ * 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/>.
+ */
+
+#pragma once
+
+/* DIP switch */
+#define DIP_SWITCH_MATRIX_GRID { { 5, 4 } }
+
+/* Disable DIP switch in matrix data */
+#define MATRIX_MASKED
+
+/* EEPROM Driver Configuration */
+#define WEAR_LEVELING_LOGICAL_SIZE 2048
+#define WEAR_LEVELING_BACKING_SIZE (WEAR_LEVELING_LOGICAL_SIZE * 2)
+
+/* Increase I2C speed to 1000 KHz */
+#define I2C1_TIMINGR_PRESC 0U
+#define I2C1_TIMINGR_SCLDEL 3U
+#define I2C1_TIMINGR_SDADEL 0U
+#define I2C1_TIMINGR_SCLH 15U
+#define I2C1_TIMINGR_SCLL 51U
+
+/* Old default behavior of mod-taps */
+#define HOLD_ON_OTHER_KEY_PRESS
+
+/* HC595 used pins definiton */
+#define HC595_STCP A0
+#define HC595_SHCP A1
+#define HC595_DS C15
+#define SHIFT_COL_START 11
+#define SHIFT_COL_END 19