qmk_firmware/keyboards/drop/cstm80/config.h

// 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 48