41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
/*
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* wiring_shift.c - shiftOut() function
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* Part of Arduino - http://www.arduino.cc/
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*
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* Copyright (c) 2005-2006 David A. Mellis
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
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*/
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#include "wirish.h"
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void shiftOut(uint8 dataPin, uint8 clockPin, uint8 bitOrder, uint8 val) {
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int i;
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for (i = 0; i < 8; i++) {
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if (bitOrder == LSBFIRST) {
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digitalWrite(dataPin, !!(val & (1 << i)));
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} else {
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digitalWrite(dataPin, !!(val & (1 << (7 - i))));
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}
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digitalWrite(clockPin, HIGH);
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digitalWrite(clockPin, LOW);
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}
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}
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