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/* Door 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 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
// todo: atomic var
static volatile int rxdr = 0;
static inline void await_reply(void)
{
int i;
radio_listen();
for (i = 0; i < 500 && rxdr == 0; i += 100)
_delay_ms(100);
}
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], msg[WDLEN + 1];
RX_DDR &= ~(1 << RX_PIN);
RX_PORT |= (1 << RX_PIN);
PCICR |= (1 << RX_PCIE);
RX_PCMSK |= (1 << RX_PCINT);
uart_init();
radio_init(rxaddr);
radio_print_config();
sei();
for (;;) {
_delay_ms(2000); /* todo: fingerprint check */
xor(KEY, SYN, msg, WDLEN);
radio_sendto(txaddr, msg, WDLEN);
await_reply();
if (rxdr) {
uart_write_line("reply received");
n = radio_recv(buf, WDLEN);
buf[n] = '\0';
if (n > 0) {
rxdr = 0;
xor(KEY, buf, key, WDLEN);
xor(key, MSG, msg, WDLEN);
radio_sendto(txaddr, msg, WDLEN);
await_reply();
if (rxdr) {
n = radio_recv(buf, WDLEN);
buf[n] = '\0';
rxdr = 0;
xor(key, buf, msg, WDLEN);
uart_write_line(msg);
} else {
// power down
uart_write_line("ERROR: no reply");
}
}
} else {
// power down
uart_write_line("ERROR: no session key");
}
}
return 0;
}
ISR(RX_PCINTVEC)
{
rxdr = 1;
}
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