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https://github.com/digistump/DigistumpArduino.git
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72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
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/*
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Copyright (c) 2011 Arduino. All right reserved.
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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.
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See the GNU Lesser General Public License for more details.
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "Arduino.h"
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#ifdef __cplusplus
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extern "C"{
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#endif
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uint32_t shiftIn( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder )
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{
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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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{
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digitalWrite( ulClockPin, HIGH ) ;
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if ( ulBitOrder == LSBFIRST )
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{
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value |= digitalRead( ulDataPin ) << i ;
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}
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else
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{
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value |= digitalRead( ulDataPin ) << (7 - i) ;
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}
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digitalWrite( ulClockPin, LOW ) ;
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}
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return value ;
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}
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void shiftOut( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder, uint32_t ulVal )
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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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{
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if ( ulBitOrder == LSBFIRST )
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{
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digitalWrite( ulDataPin, !!(ulVal & (1 << i)) ) ;
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}
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else
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{
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digitalWrite( ulDataPin, !!(ulVal & (1 << (7 - i))) ) ;
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}
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digitalWrite( ulClockPin, HIGH ) ;
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digitalWrite( ulClockPin, LOW ) ;
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}
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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