2014-12-28 06:29:08 -08:00
|
|
|
/*
|
|
|
|
* 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 "wirish.h"
|
|
|
|
|
|
|
|
void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 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);
|
|
|
|
}
|
|
|
|
}
|
2016-12-08 01:00:20 -08:00
|
|
|
|
|
|
|
uint32 shiftIn( uint32 ulDataPin, uint32 ulClockPin, uint32 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 ;
|
|
|
|
}
|