dipl/code/textadv/include/16550.h

/* Copyright © 2020 tyrolyean
 *
 * 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 3 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/>.
 */

#ifndef _16550_H
#define _16550_H

#include <stdint.h>
#include <stdio.h>

/* Registers in the 16550 UART */

#define UART_REG_DLLS   0
#define UART_REG_DLMS   1
#define UART_REG_TXRX   0
#define UART_REG_IER    1
#define UART_REG_IIR    2
#define UART_REG_LCR    3
#define UART_REG_MCR    4
#define UART_REG_LSR    5
#define UART_REG_MSR    6
#define UART_REG_SCR    7

/* The printf function in the background performs automatic column wrapping by
 * finding the first space character within 10 characters ofthe display columns
 * and replacingit with a newline character 
 */
#define DISPLAY_COLUMNS 80

void init_16550();
void write_to_uart(uint8_t addr, uint8_t data);
uint8_t read_from_uart(uint8_t addr);

void init_uart();

int println(const char* output,...);
int putchar_16550(char var, FILE *stream);
void writechar_16550(char var);

void routine_uart();

#endif