blob: 9faec5d2bbf909505055ffc3f86ea41788179e87 (
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
88
89
90
91
92
93
94
95
96
97
98
99
100
|
#include <avr/io.h>
#include "defines.h"
#include "ibutton.h"
#include "bits.h"
#include "cyfral.h"
#include "onewire.h"
inline void cyfral_send_nibble(uint8_t data)
{
uint8_t b;
for (b = 0; b < 4; b++)
{
if (data & (1UL<<b))
{
ONEWIRE_MASTER_TX(105);
ONEWIRE_WAIT(36);
} else {
ONEWIRE_MASTER_TX(53);
ONEWIRE_WAIT(80);
}
}
}
void cyfral_send(uint16_t key)
{
cyfral_send_nibble(0b0111);
uint8_t b;
for (b = 0; b < 8; b++)
{
speedup_leds();
update_leds();
cyfral_send_nibble(1UL << ((key >> (b*2)) & 0b11));
}
}
long int read_cyfral()
{
uint16_t buffer[100];
int pos = 0;
do
{
TCNT1 = 0;
while (!CYFRAL_SIGNAL && TCNT1 < 0x400);
if (TCNT1 >= 0x400) return -1;
//buffer[pos++] = TCNT1;
TCNT1 = 0;
while (CYFRAL_SIGNAL && TCNT1 < 0x400);
if (TCNT1 >= 0x400) return -1;
buffer[pos++] = TCNT1;
} while (pos < sizeof(buffer)/2);
int i, j;
int startpos = -1;
for (i = 0; i < pos-9*4; i++)
{
if ((buffer[i] > 70) && (buffer[i+1] > 70) && (buffer[i+2] > 70) && (buffer[i+3] < 70))
{
startpos = i;
break;
}
}
uint16_t code = 0;
int b = 0;
if (startpos >= 0)
{
for (i = startpos+4; i < startpos+9*4; i+=4)
{
for (j = 0; j < 4; j++)
{
//send_num(buffer[i+j]);
if (buffer[i+j] > 70)
code |= j << (b*2);
}
b++;
}
} else return -1;
return code;
}
long int read_cyfral_with_check()
{
long int code = 0, tries = 0, i;
for (i = 0; i < 10; i++)
{
long int code2 = read_cyfral();
if ((code2 >= 0) && (code == code2))
{
tries++;
} else {
tries = 0;
code = code2;
}
if (tries >= 3)
{
return code2;
}
}
return -1;
}
|
