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#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include "uart.h"
#define LOCK_PIN PD2
#define UNLOCK_PIN PD3
static inline void init_wdt(void)
{
cli();
wdt_reset();
WDTCSR |= (1 << WDCE) | ( 1 << WDE);
WDTCSR = (1 << WDP2) | (1 << WDP1) | (1 << WDP0);
WDTCSR |= (1 << WDIE);
}
static inline void init_btns(void)
{
DDRD &= ~((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
PORTD |= ((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
EICRA = 0b00000000;
EIMSK = (1 << INT0) | (1 << INT1);
}
int main(void)
{
init_wdt();
init_btns();
uart_init();
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sei();
for (;;) {
uart_write_line("Going to sleep");
sleep_enable();
sleep_bod_disable();
sleep_cpu();
sleep_disable();
_delay_ms(500); /* wait for start-up */
uart_write_line("Doing some work...");
_delay_ms(500);
}
return 0;
}
static inline int is_btn_pressed(uint8_t pin, uint8_t btn)
{
if (!((pin >> btn) & 0x01)) {
_delay_ms(100);
return !((pin >> btn) & 0x01);
}
return 0;
}
ISR(INT0_vect)
{
if (is_btn_pressed(PIND, LOCK_PIN))
uart_write_line("Locked");
}
ISR(INT1_vect)
{
if (is_btn_pressed(PIND, UNLOCK_PIN))
uart_write_line("Unlocked");
}
ISR(WDT_vect)
{
}
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