qmk_firmware/keyboards/koca58/config.h

/* Copyright 2025 oxnh */
/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once

#define SERIAL_USART_FULL_DUPLEX   // Enable full duplex operation mode.
#define SERIAL_USART_TX_PIN C10    // USART TX pin
#define SERIAL_USART_RX_PIN C11    // USART RX pin
#define SERIAL_USART_DRIVER SD3
#define USART3_PARTIALREMAP