WaspmoteAPI: wiring_shift.c Source File

00001 /*
00002  *  Copyright (c) 2005-2006 David A. Mellis
00003  *
00004  *  This program is free software: you can redistribute it and/or modify
00005  *  it under the terms of the GNU Lesser General Public License as published by
00006  *  the Free Software Foundation, either version 2.1 of the License, or
00007  *  (at your option) any later version.
00008    
00009  *  This program is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *  GNU Lesser General Public License for more details.
00013   
00014  *  You should have received a copy of the GNU Lesser General Public License
00015  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
00016  */
00017 
00018 #include "wiring_private.h"
00019 
00020 void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, byte val)
00021 {
00022         int i;
00023 
00024         for (i = 0; i < 8; i++)  {
00025                 if (bitOrder == LSBFIRST)
00026                         digitalWrite(dataPin, !!(val & (1 << i)));
00027                 else    
00028                         digitalWrite(dataPin, !!(val & (1 << (7 - i))));
00029                         
00030                 digitalWrite(clockPin, HIGH);
00031                 digitalWrite(clockPin, LOW);            
00032         }
00033 }