/*
 * 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);
    }
}

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 ;
}