keychron_qmk_firmware/keyboards/boardsource/lulu/rp2040/config.h

// Copyright 2022 jack (@waffle87)
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 200U
#define SERIAL_USART_FULL_DUPLEX
#define SERIAL_USART_TX_PIN GP0
#define SERIAL_USART_RX_PIN GP1
#define I2C_DRIVER I2CD1
#define I2C1_SDA_PIN GP22
#define I2C1_SCL_PIN GP23