frederic blanc / ArduinoFB

Test arduino code

Dependents:   DR14_4D7S_US

Fork of ArduinoHAL by René Bohne

wiring_shift.c@4:40396527a068, 2011-06-04 (annotated)

Committer:
rbohne
Date:
Sat Jun 04 20:16:04 2011 +0000
Revision:
4:40396527a068
Parent:
2:7e1ff33bc76a 

        

        
Who changed what in which revision?

        

            
                
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/*





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  wiring_shift.c - shiftOut() function





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  Part of Arduino - http://www.arduino.cc/





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  Copyright (c) 2005-2006 David A. Mellis





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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





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  License as published by the Free Software Foundation; either





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  version 2.1 of the License, or (at your option) any later version.





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  This library is distributed in the hope that it will be useful,





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  but 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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  You should have received a copy of the GNU Lesser General





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  Public License along with this library; if not, write to the





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  Free Software Foundation, Inc., 59 Temple Place, Suite 330,





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  Boston, MA  02111-1307  USA





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  $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $





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*/





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#include "wiring_private.h"





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uint8_t shiftIn(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder) {





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	uint8_t value = 0;





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	uint8_t i;





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	for (i = 0; i < 8; ++i) {





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		digitalWrite(clockPin, HIGH);





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		if (bitOrder == LSBFIRST)





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			value |= digitalRead(dataPin) << i;





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		else





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			value |= digitalRead(dataPin) << (7 - i);





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		digitalWrite(clockPin, LOW);





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	}





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	return value;





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}





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void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, uint8_t val)





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{





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	uint8_t 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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		digitalWrite(clockPin, HIGH);





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		digitalWrite(clockPin, LOW);		





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	}





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}