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#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <util/setbaud.h>
#define TEST_LED PB1
#define LOCK_LED PD6
#define UNLOCK_LED PD7
#define SYN 0xA1
#define FIN 0xB2
#define LOCK 0xC3
#define UNLOCK 0xD3
static void usart_init(void)
{
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
UCSR0B = (1 << RXEN0) | (1 << RXCIE0);
UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
}
static unsigned char usart_recv(void)
{
while((UCSR0A & (1 << RXC0)) == 0);
return UDR0;
}
static void led_init(void)
{
DDRB |= (1 << TEST_LED);
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;
}
ISR(USART_RX_vect)
{
unsigned char data, buf;
data = 0;
buf = usart_recv();
if (buf == SYN) {
buf = usart_recv();
while (buf != FIN) {
buf = usart_recv();
if (buf == SYN) {
PORTB ^= (1 << TEST_LED);
return;
}
if (buf != FIN)
data = buf;
}
if(data == LOCK) {
PORTD |= (1 << LOCK_LED);
PORTD &= ~(1 << UNLOCK_LED);
} else if (data == UNLOCK) {
PORTD |= (1 << UNLOCK_LED);
PORTD &= ~(1 << LOCK_LED);
}
}
}
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