qmk_firmware/keyboards/keebio/cepstrum/rev1/config.h

// Copyright 2022 Danny Nguyen (danny@keeb.io)
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#define SPLIT_HAND_PIN GP4

#define USB_VBUS_PIN GP12

#define SERIAL_USART_FULL_DUPLEX
#define SERIAL_USART_TX_PIN GP0
#define SERIAL_USART_RX_PIN GP1
#define SERIAL_USART_PIN_SWAP

#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 1000U

#define I2C_DRIVER I2CD2
#define I2C1_SCL_PIN GP22
#define I2C1_SDA_PIN GP23