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/* Lock front, connected to the fingerprint scanner */
#include <stdint.h>
#include <stdlib.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include "nrfm.h"
#include "uart.h"
#include "util.h"
#define LOCK_PIN PD2
#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
uint8_t sync = 0;
static volatile uint8_t rxd = 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);
PORTD |= (1 << LOCK_PIN);
EICRA = 0b00000000;
EIMSK = (1 << INT0);
}
int main(void)
{
uint8_t n;
uint8_t rxaddr[ADDRLEN] = { 194, 178, 82 };
uint8_t txaddr[ADDRLEN] = { 194, 178, 83 };
char buf[WDLEN + 1], key[WDLEN + 1];
init_rx();
init_btns();
uart_init();
radio_init(rxaddr);
radio_print_config();
sei();
for (;;) {
if ((islock || isunlock) && !sync) {
xor(KEY, SYN, buf, WDLEN);
do {
sync = radio_sendto(txaddr, buf, WDLEN);
_delay_ms(10);
} while (!sync);
sync = 1;
}
if (rxd) {
if (sync) {
n = radio_recv(buf, WDLEN);
buf[n] = '\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);
sync = 0;
} else {
radio_flush_rx();
}
rxd = 0;
}
}
return 0;
}
ISR(RX_PCINTVEC)
{
rxd = 1;
}
ISR(INT0_vect)
{
islock = 1;
}
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