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/*
atmega48_charlcd.c
Copyright Luki <humbell@ethz.ch>
Copyright 2011 Michel Pollet <buserror@gmail.com>
This file is part of simavr.
simavr 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.
simavr 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 simavr. If not, see <http://www.gnu.org/licenses/>.
*/
#undef F_CPU
#define F_CPU 10000000
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <avr/sleep.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
//#include "avr_defines.h"
#include "avr_mcu_section.h"
AVR_MCU(F_CPU, "atmega48");
static uint8_t subsecct = 0;
static uint8_t hour = 0;
static uint8_t minute = 0;
static uint8_t second = 0;
static volatile uint8_t update_needed = 0;
#include "avr_hd44780.c"
ISR( INT0_vect )
{
/* External interrupt on pin D2 */
subsecct++;
if (subsecct == 50) {
second++;
subsecct = 0;
update_needed = 1;
if (second == 60) {
minute++;
second = 0;
if (minute == 60) {
minute = 0;
hour++;
if (hour == 24)
hour = 0;
}
}
}
}
int main()
{
hd44780_init();
/*
* Clear the display.
*/
hd44780_outcmd(HD44780_CLR);
hd44780_wait_ready(1); // long wait
/*
* Entry mode: auto-increment address counter, no display shift in
* effect.
*/
hd44780_outcmd(HD44780_ENTMODE(1, 0));
hd44780_wait_ready(0);
/*
* Enable display, activate non-blinking cursor.
*/
hd44780_outcmd(HD44780_DISPCTL(1, 1, 0));
hd44780_wait_ready(0);
EICRA = (1 << ISC00);
EIMSK = (1 << INT0);
sei();
while (1) {
while (!update_needed)
sleep_mode();
update_needed = 0;
char buffer[16];
hd44780_outcmd(HD44780_CLR);
hd44780_wait_ready(1); // long wait
hd44780_outcmd(HD44780_DDADDR(4));
hd44780_wait_ready(0);
sprintf(buffer, "%2d:%02d:%02d", hour, minute, second);
char *s = buffer;
while (*s) {
hd44780_outdata(*s++);
hd44780_wait_ready(0);
}
}
}
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