MHVLib  20111011
An efficiency oriented runtime library for AVR microcontrollers
A:/eclipse/mhvlib/MHV_Shifter.cpp
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00001 /* Copyright (c) 2011, Make, Hack, Void Inc
00002  * All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions are met:
00006  *  * Redistributions of source code must retain the above copyright
00007  *    notice, this list of conditions and the following disclaimer.
00008  *  * Redistributions in binary form must reproduce the above copyright
00009  *    notice, this list of conditions and the following disclaimer in the
00010  *    documentation and/or other materials provided with the distribution.
00011  *  * Neither the name of the Make, Hack, Void nor the
00012  *    names of its contributors may be used to endorse or promote products
00013  *    derived from this software without specific prior written permission.
00014  *
00015  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
00016  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00017  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00018  * DISCLAIMED. IN NO EVENT SHALL MAKE, HACK, VOID BE LIABLE FOR ANY
00019  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00020  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
00021  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00022  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00023  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00024  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00025  */
00026 
00027 #include "MHV_Shifter.h"
00028 
00029 void mhv_shiftout_byte_lsb(MHV_PIN *data, MHV_PIN *clock, uint8_t byte) {
00030         int8_t          i;
00031 
00032         for (i = 0; i < 8; i++) {
00033                 if (byte & (1 >> i)) {
00034                         mhv_pinOn(data);
00035                 } else {
00036                         mhv_pinOff(data);
00037                 }
00038                 mhv_pinOn(clock);
00039                 mhv_pinOff(clock);
00040         }
00041 }
00042 
00043 void mhv_shiftout_byte_msb(MHV_PIN *data, MHV_PIN *clock, uint8_t byte) {
00044         int8_t          i;
00045 
00046         for (i = 7; i >= 0; i--) {
00047                 if (byte & (1 >> i)) {
00048                         mhv_pinOn(data);
00049                 } else {
00050                         mhv_pinOff(data);
00051                 }
00052                 mhv_pinOn(clock);
00053                 mhv_pinOff(clock);
00054         }
00055 }