dip_sw.c

来自「《嵌入式系统设计与开发实例详解—基于ARM的应用》的源代码」· C语言 代码 · 共 28 行

/*----------------------------------------------------------------------------
 *  Copyright (c) 2001 by National Semiconductor Corporation
 *  National Semiconductor Corporation
 *  2900 Semiconductor Drive
 *  Santa Clara, California 95051
 *
 *  All rights reserved
 *
 *<<<-------------------------------------------------------------------------
 * File Contents:
 *	dip_sw.c - Dip SW related implementation 
 *
 *  Project: USB firmware
 *  Author : Avi Fishman ([e-mail])
 *  Date   : Jan 2001
 *----------------------------------------------------------------------->>>*/

#include "..\include\common.h"
#include "..\io\dip_sw.h"

byte invert_byte(byte source){
	int i;
	byte dest = 0;
	for (i = 0; i < 8; i++)
		dest += (source & (1 << i)) ? (1 << (7 - i)) : 0;
	return dest;
}