/* 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 .
*/
#include "avr.h"
#include "16550.h"
#include "structures.h"
#include "game.h"
#include
static FILE stdout_16550 = FDEV_SETUP_STREAM(putchar_16550, NULL,
_FDEV_SETUP_WRITE);
void write_to_uart(uint8_t addr, uint8_t data){
set_addr(addr);
DATA_DDR_REG = 0xFF;
DATA_REG = data;
CTRL_REG &= ~(1< (DISPLAY_COLUMNS - 10)){
putchar_16550('\n',NULL);
return 0;
}
if(var == '\n'){
column_cnt = 0x00;
writechar_16550('\r');
}
writechar_16550(var);
return 0;
}
/* Writes a character to the 16550 uart for transmission without cr lf magic */
void writechar_16550(char var){
for(uint32_t i = 0; i < 1000000; i++ ){
uint8_t received = read_from_uart(UART_REG_LSR);
if((received & (1<<5))){
break;
}
}
write_to_uart(UART_REG_TXRX,var);
return;
}
void routine_uart(){
uint8_t received = read_from_uart(UART_REG_LSR);
if(received & 0x01){
received = read_from_uart(UART_REG_TXRX);
ingest_user_char(received);
if(received == '\r'){
writechar_16550('\n');
}
writechar_16550(received); /* Echo back */
}
return;
}