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#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <util/setbaud.h>
#define LOCK_LED PD6
#define UNLOCK_LED 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 unsigned char usart_recv(void)
{
while((UCSR0A & (1 << RXC0)) == 0);
return UDR0;
}
static void led_init(void)
{
DDRD |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
PORTD |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
}
int main(void)
{
usart_init();
led_init();
sei();
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;
}
ISR(USART_RX_vect)
{
unsigned char addr, data, chk;
addr = usart_recv();
data = usart_recv();
chk = usart_recv();
if(chk == (addr + data))
{
if(addr == ADDR)
{
if(data == LOCK_CMD) {
PORTC |= (1 << LOCK_LED);
PORTC &= ~(1 << UNLOCK_LED);
} else if (data == UNLOCK_LED) {
PORTC |= (1 << UNLOCK_LED);
PORTC &= ~(1 << LOCK_LED);
}
}
}
}
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