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/*
atmega32_ds1338.c
Copyright 2014 Doug Szumski <d.s.szumski@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/>.
*/
#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdio.h>
#undef F_CPU
#define F_CPU 7380000
#include "avr_mcu_section.h"
AVR_MCU(F_CPU, "atmega32");
#include "ds1338.h"
#include "i2cmaster.h"
volatile uint8_t update_flag;
/*
* This demo consists of a DS1338 RTC connected via the TWI bus
* of an atmega32. The square wave output of the DS1338 is
* enabled, with the tick-rate set to 1HZ. This is then fed
* to pin D3 on the atmega32 which is configured to generate
* an interrupt on a rising edge. When the interrupt fires the
* time is read from the DS1338.
*/
int
main()
{
i2c_init();
/*
* Demonstrate the virtual part functionality.
*/
ds1338_init();
ds1338_time_t time = {
.date = 31,
.day = 6,
.hours = 23,
.minutes = 59,
.month = 12,
.seconds = 56,
.year = 14,
};
ds1338_set_time(&time);
// Setup pin change interrupt for the square wave output
cli();
DDRD &= ~(1 << PD3);
// Fire INT1 on the rising edge
MCUCR |= (1 << ISC11) | (1 << ISC10);
GICR |= (1 << INT1);
sei();
while(time.seconds != 2)
{
if (update_flag) {
ds1338_get_time(&time);
update_flag = 0;
}
}
cli();
sleep_mode();
}
ISR (INT1_vect)
{
update_flag = 1;
}
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