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#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <util/setbaud.h>
#define LOCK_LED PB1
#define LOCK_BTN PD6
#define UNLOCK_BTN PD7
#define SYN 0xA4
#define ADDR 0x01
#define LOCK_CMD 0x02
#define UNLOCK_CMD 0x03
static void usart_init(void)
{
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
UCSR0B = (1 << TXEN0);
UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
}
static void usart_send(unsigned char data)
{
while (!(UCSR0A & (1 << UDRE0)))
;
UDR0 = data;
}
static inline void pcint2_init(void)
{
PCICR |= (1 << PCIE2);
PCMSK2 |= ((1 << PCINT22) | (1 << PCINT23));
}
static inline void lock(void)
{
PORTB ^= (1 << LOCK_LED);
usart_send(SYN);
usart_send(ADDR);
usart_send(LOCK_CMD);
usart_send(LOCK_CMD + ADDR);
}
static inline void unlock(void)
{
PORTB ^= (1 << LOCK_LED);
usart_send(SYN);
usart_send(ADDR);
usart_send(UNLOCK_CMD);
usart_send(UNLOCK_CMD + ADDR);
}
int main(void)
{
DDRB |= (1 << LOCK_LED);
PORTB |= (1 << LOCK_LED);
usart_init();
//pcint2_init();
//sei();
for (;;) {
_delay_ms(2000);
lock();
_delay_ms(2000);
unlock();
}
return 0;
}
static inline int is_btn_pressed(unsigned char btn)
{
if (!((PIND >> btn) & 0x01)) {
_delay_us(2000);
return !((PIND >> btn) & 0x01);
}
return 0;
}
ISR(PCINT2_vect)
{
if (is_btn_pressed(LOCK_BTN)) {
PORTB ^= (1 << LOCK_LED);
//lock();
}
if (is_btn_pressed(UNLOCK_BTN)) {
PORTB ^= (1 << LOCK_LED);
//unlock();
}
}
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