1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* Door back, connected to the fingerprint scanner */
#include <stdint.h>
#include <string.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)
{
uint8_t i;
radio_listen();
for (i = 0; i < 500 && rxdr == 0; i += 100)
_delay_ms(100);
}
int main(void)
{
uint8_t rxaddr[ADDRLEN] = { 194, 178, 83 };
uint8_t txaddr[ADDRLEN] = { 194, 178, 82 };
char buf[WDLEN + 1];
char key[WDLEN + 1];
char 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();
radio_listen();
for (;;) {
if (rxdr) {
n = radio_recv(buf, WDLEN);
buf[n] = '\0';
rxdr = 0;
xor(KEY, buf, msg, WDLEN);
if (strncmp(msg, SYN, WDLEN) == 0) {
xor(KEY, key, 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);
if (strncmp(msg, LOCK, WDLEN) == 0) {
uart_write_line("LOCKED");
} else if (strncmp(msg, UNLOCK, WDLEN) == 0) {
uart_write_line("UNLOCKED");
} else {
uart_write("ERROR: unknown message ");
uart_write_line(msg);
}
}
} else {
uart_write_line("ERROR: handshake failed");
}
} else {
uart_write_line("No IRQ");
_delay_ms(2000);
}
}
return 0;
}
ISR(RX_PCINTVEC)
{
rxdr = 1;
}
|
