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#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#define LOCK_BTN PD6
#define UNLOCK_BTN PD7
#define SYN 0xAA
#define LOCK 0xB5
#define UNLOCK 0xAE
static inline void spi_init(void)
{
DDR_SPI = (1 << DD_MOSI) | (1 << DD_SCK);
SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR0);
}
static inline void spi_send(unsigned char data)
{
SPRD = data;
while (!(SPSR & (1 << SPIF)))
;
}
static inline void lock(void)
{
spi_send(SYN);
spi_send(LOCK);
}
static inline void unlock(void)
{
spi_send(SYN);
spi_send(UNLOCK);
}
static inline int is_btn_pressed(unsigned char btn)
{
if (!((PINB >> btn) & 0x01)) {
_delay_us(2000);
return !((PINB >> btn) & 0x01);
}
return 0;
}
static inline void pcint2_init(void)
{
PCICR |= (1 << PCIE2);
PCMSK2 |= ((1 << PCINT22) | (1 << PCINT23));
}
int main(void)
{
DDRD &= ~((1 << LOCK_BTN) | (1 << UNLOCK_BTN));
PORTD |= (1 << LOCK_BTN) | (1 << UNLOCK_BTN);
spi_init();
pcint2_init();
sei();
for (;;)
;
return 0;
}
ISR(PCINT2_vect)
{
if (is_btn_pressed(LOCK_BTN))
lock();
if (is_btn_pressed(UNLOCK_BTN))
unlock();
}
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