blob: 3ea07198a9825ed51feca60e99b61216bf5a220c (
plain)
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
|
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#define LOCK_LED PB5
#define LOCK_BTN PD6
#define UNLOCK_BTN PD7
#define SYN 0xAA
#define LOCK 0xB5
#define UNLOCK 0xAE
#define SIGPIN PD2
#define SIGLEN 500
static inline void send(unsigned char c)
{
int n;
for (n = 7; n >= 0; n--) {
PORTD = ((c >> n) & 1) == 1
? PORTD | (1 << SIGPIN)
: PORTD & ~(1 << SIGPIN);
_delay_us(SIGLEN);
}
PORTD &= ~(1 << SIGPIN);
}
static inline void lock(void)
{
send(SYN);
send(LOCK);
PORTB |= (1 << LOCK_LED);
}
static inline void unlock(void)
{
send(SYN);
send(UNLOCK);
PORTB &= ~(1 << LOCK_LED);
}
static inline int is_btn_pressed(unsigned char btn)
{
if (!((PINB >> btn) & 0x01)) {
_delay_us(2000);
return !((PINB >> btn) & 0x01);
}
return 0;
}
static inline void pcint2_init(void)
{
PCICR |= (1 << PCIE2);
PCMSK2 |= ((1 << PCINT22) | (1 << PCINT23));
}
int main(void)
{
DDRB |= (1 << LOCK_LED);
DDRD &= ~((1 << LOCK_BTN) | (1 << UNLOCK_BTN));
PORTD |= (1 << LOCK_BTN) | (1 << UNLOCK_BTN);
DDRD |= (1 << SIGPIN);
PORTD &= ~(1 << SIGPIN);
pcint2_init();
sei();
for (;;) {
}
return 0;
}
ISR(PCINT2_vect)
{
if (is_btn_pressed(LOCK_BTN))
lock();
if (is_btn_pressed(UNLOCK_BTN))
unlock();
}
|
