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/* Lock front, connected to the fingerprint scanner */
#include <stdint.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "nrfm.h"
#include "uart.h"
#include "util.h"
#define LOCK_PIN PD2
#define UNLOCK_PIN PD3
#define RX_PIN PD7
#define RX_DDR DDRD
#define RX_PORT PORTD
#define RX_PCIE PCIE2
#define RX_PCINT PCINT23
#define RX_PCMSK PCMSK2
#define RX_PCINTVEC PCINT2_vect
static volatile uint8_t rxd = 0;
static volatile uint8_t sync = 0;
static volatile uint8_t islock = 0;
static volatile uint8_t isunlock = 0;
static inline void init_rx(void)
{
RX_DDR &= ~(1 << RX_PIN);
RX_PORT |= (1 << RX_PIN);
PCICR |= (1 << RX_PCIE);
RX_PCMSK |= (1 << RX_PCINT);
}
static inline void init_btns(void)
{
DDRD &= ~((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
PORTD |= ((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
EICRA = 0b00000000;
EIMSK = (1 << INT0) | (1 << INT1);
}
int main(void)
{
uint8_t n;
uint8_t rxaddr[ADDRLEN] = { 194, 178, 82 };
uint8_t txaddr[ADDRLEN] = { 194, 178, 83 };
char buf[WDLEN], key[WDLEN];
init_rx();
init_btns();
uart_init();
radio_init(rxaddr);
radio_print_config();
sei();
radio_listen();
for (;;) {
if (!sync && (islock || isunlock)) {
xor(KEY, SYN, buf, WDLEN);
do {
sync = radio_sendto(txaddr, buf, WDLEN);
_delay_ms(50);
} while (!sync);
uart_write_line("sent SYN");
}
if (rxd) {
n = radio_recv(buf, WDLEN);
rxd = 0;
if (sync && (islock || isunlock)) {
sync = 0;
xor(KEY, buf, key, WDLEN);
if (islock) {
islock = 0;
xor(key, LOCK, buf, WDLEN);
} else if (isunlock) {
isunlock = 0;
xor(key, UNLOCK, buf, WDLEN);
}
radio_sendto(txaddr, buf, WDLEN);
}
}
}
return 0;
}
ISR(RX_PCINTVEC)
{
rxd = 1;
}
ISR(INT0_vect)
{
if (is_btn_pressed(PIND, LOCK_PIN)) {
sync = 0;
islock = 1;
}
}
ISR(INT1_vect)
{
if (is_btn_pressed(PIND, UNLOCK_PIN)) {
sync = 0;
isunlock = 1;
}
}
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