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 /*   wiring_shift.c - shiftOut() function   Part of Arduino - http://www.arduino.cc/    Copyright (c) 2005-2006 David A. Mellis    This libr...”

2016-04-25T02:01:47Z

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<pre style="color:blue">
/*
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"

uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) {
uint8_t value = 0;
uint8_t i;

for (i = 0; i < 8; ++i) {
digitalWrite(clockPin, HIGH);
if (bitOrder == LSBFIRST)
value |= digitalRead(dataPin) << i;
else
value |= digitalRead(dataPin) << (7 - i);
digitalWrite(clockPin, LOW);
}
return value;
}

void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)
{
uint8_t 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);
}
}

</pre>

Wiring shift.c - 版本历史

YWrobot CYB：创建页面，内容为“
/* wiring_shift.c - shiftOut() function Part of Arduino - http://www.arduino.cc/ Copyright (c) 2005-2006 David A. Mellis This libr...”