41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
|
/*
|
||
|
|
wiring_shift.c - shiftOut() function
|
||
|
|
Part of Arduino - http://www.arduino.cc/
|
||
|
|
|
||
|
|
Copyright (c) 2005-2006 David A. Mellis
|
||
|
|
|
||
|
|
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., 59 Temple Place, Suite 330,
|
||
|
|
Boston, MA 02111-1307 USA
|
||
|
|
|
||
|
|
$Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "wiring_private.h"
|
||
|
|
|
||
|
|
void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, byte val)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < 8; i++) {
|
||
|
|
if (bitOrder == LSBFIRST)
|
||
|
|
digitalWrite(dataPin, !!(val & (1 << i)));
|
||
|
|
else
|
||
|
|
digitalWrite(dataPin, !!(val & (1 << (7 - i))));
|
||
|
|
|
||
|
|
digitalWrite(clockPin, HIGH);
|
||
|
|
digitalWrite(clockPin, LOW);
|
||
|
|
}
|
||
|
|
}
|