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#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <util/setbaud.h>
#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;
#if USE_2X
UCSR0A |= (1 << U2X0);
#else
UCSR0A &= ~(1 << U2X0);
#endif
UCSR0B = (1 << TXEN0) | (1 << RXEN0);
UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
}
static void usart_send(unsigned char data)
{
while (!(UCSR0A & (1 << UDRE0)))
;
UDR0 = data;
}
int main(void)
{
usart_init();
for (;;)
;
return 0;
}
static inline int is_btn_pressed(unsigned char btn)
{
if (!((PIND >> btn) & 0x01)) {
_delay_us(2000);
return !((PIND >> btn) & 0x01);
}
return 0;
}
static inline void lock(void)
{
usart_send(SYN);
usart_send(ADDR);
usart_send(LOCK_CMD);
usart_send(LOCK_CMD + ADDR);
}
static inline void unlock(void)
{
usart_send(SYN);
usart_send(ADDR);
usart_send(UNLOCK_CMD);
usart_send(UNLOCK_CMD + ADDR);
}
ISR(PCINT2_vect)
{
if (is_btn_pressed(LOCK_BTN))
lock();
if (is_btn_pressed(UNLOCK_BTN))
unlock();
}
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