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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/* Lock back, connected to the servo */
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "nrfm.h"
#include "uart.h"
#include "util.h"
#define PWM_MIN 500
#define PWM_MID 1500
#define PWM_MAX 2500
#define PWM_TOP 20000
#define SERVO_PIN PB1
#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 char tab[] = {
'0', '8', '3', '6', 'a', 'Z', '$', '4', 'v', 'R', '@',
'E', '1', 'o', '#', ')', '2', '5', 'q', ';', '.', 'I',
'c', '7', '9', '*', 'L', 'V', '&', 'k', 'K', '!', 'm',
'N', '(', 'O', 'Q', 'A', '>', 'T', 't', '?', 'S', 'h',
'w', '/', 'n', 'W', 'l', 'M', 'e', 'H', 'j', 'g', '[',
'P', 'f', ':', 'B', ']', 'Y', '^', 'F', '%', 'C', 'x'
};
static uint8_t sync = 0;
static uint16_t tablen = sizeof(tab) / sizeof(tab[0]);
static volatile uint8_t rxd = 0;
static volatile uint8_t islock = 0;
static volatile uint8_t isunlock = 0;
static inline void keygen(char *buf, uint8_t n)
{
int i, imax;
uint8_t sreg;
uint16_t seed;
sreg = SREG;
cli();
seed = TCNT1;
SREG = sreg;
for (i = 0, imax = n - 1; i < imax; i++, seed++)
buf[i] = tab[(seed % tablen)];
buf[imax] = '\0';
}
static inline void keydel(char *buf, uint8_t n)
{
int i;
for (i = 0; i < n; i++)
buf[i] = 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);
}
static inline void init_servo(void)
{
}
static inline void lock(void)
{
}
static inline void unlock(void)
{
}
int main(void)
{
uint8_t n;
uint8_t rxaddr[ADDRLEN] = { 194, 178, 83 };
uint8_t txaddr[ADDRLEN] = { 194, 178, 82 };
char s[3]; s[2] = 0;
char buf[WDLEN + 1], key[WDLEN + 1], msg[WDLEN + 1];
init_rx();
init_btns();
init_servo();
uart_init();
radio_init(rxaddr);
radio_print_config();
sei();
radio_listen();
uart_write_line("reset...");
for (;;) {
if (!rxd)
_delay_ms(500);
if (rxd) {
n = radio_recv(buf, WDLEN);
buf[n] = '\0';
uart_write("recv: ");
uart_write(buf);
itoa(n, s, 10);
uart_write(s);
uart_write_line(" bytes");
if (!sync) {
xor(KEY, buf, msg, WDLEN);
if (strncmp(msg, SYN, WDLEN) == 0) {
keygen(key, WDLEN + 1);
xor(KEY, key, buf, WDLEN);
sync = radio_sendto(txaddr, buf, WDLEN);
} else {
uart_write_line("not syn");
}
} else {
sync = 0;
xor(key, buf, msg, WDLEN);
if (strncmp(msg, LOCK, WDLEN) == 0)
lock();
else if (strncmp(msg, UNLOCK, WDLEN) == 0)
unlock();
keydel(buf, WDLEN);
}
rxd = 0;
}
if (islock) {
lock();
islock = 0;
} else if (isunlock) {
unlock();
isunlock = 0;
}
}
return 0;
}
ISR(RX_PCINTVEC)
{
rxd = 1;
}
ISR(INT0_vect)
{
if (is_btn_pressed(PIND, LOCK_PIN))
islock = 1;
}
ISR(INT1_vect)
{
if (is_btn_pressed(PIND, UNLOCK_PIN))
isunlock = 1;
}
|
