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
|
/*
Copyright (c) 2014 Arduino. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "wiring_shift.h"
#include "wiring_digital.h"
#include "wiring_private.h"
#ifdef __cplusplus
extern "C"{
#endif
uint32_t shiftIn( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder )
{
uint8_t value = 0 ;
uint8_t i ;
for ( i=0 ; i < 8 ; ++i )
{
digitalWrite( ulClockPin, HIGH ) ;
if ( ulBitOrder == LSBFIRST )
{
value |= digitalRead( ulDataPin ) << i ;
}
else
{
value |= digitalRead( ulDataPin ) << (7 - i) ;
}
digitalWrite( ulClockPin, LOW ) ;
}
return value ;
}
void shiftOut( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder, uint32_t ulVal )
{
uint8_t i ;
for ( i=0 ; i < 8 ; i++ )
{
if ( ulBitOrder == LSBFIRST )
{
digitalWrite( ulDataPin, !!(ulVal & (1 << i)) ) ;
}
else
{
digitalWrite( ulDataPin, !!(ulVal & (1 << (7 - i))) ) ;
}
digitalWrite( ulClockPin, HIGH ) ;
digitalWrite( ulClockPin, LOW ) ;
}
}
#ifdef __cplusplus
} // extern "C"
#endif
|
