简单的C语言语句

只看该作者 · 2010-11-30 15:34

ATMGE128手册中关于EEPROM的读写操作中有段代码
void EEPRON_write(unsigned int uiaddress,unsigned int ucdata)
{
/*等待上次写结束*/
while(EECR&(1<<EEWE));
/*设置地址和数据寄存器*/
EEAR=uiaddress;
EEDR=ucdata;
  /*置位EEMWE*/
EECR|=(1<<EEMWE);
  /*置位EEWE启动写操作*/
EECR|=(1<<EEWE);
}
中的1<<EEMWE 是怎么运算能刚好把EECR中的 EEMWE 位置1？

只看该作者 · 2010-11-30 15:42

EEWE 其实这个东西是代表一个数字的你去GCC的文件看一下你就明白了~~

只看该作者 · 2010-11-30 16:19

GCC文件？没找到。。

只看该作者 · 2010-11-30 18:40

用AVR Studio 4  不要直接用GCC 然后就能看见了

/* Copyright (c) 2004 Eric B. Weddington
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in
   the documentation and/or other materials provided with the
   distribution.

* Neither the name of the copyright holders nor the names of
   contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE. */

/* $Id: iom16.h,v 1.14.2.6 2009/02/11 18:05:26 arcanum Exp $ */

/* avr/iom16.h - definitions for ATmega16 */

#ifndef _AVR_IOM16_H_
#define _AVR_IOM16_H_ 1

/* This file should only be included from <avr/io.h>, never directly. */

#ifndef _AVR_IO_H_
#  error "Include <avr/io.h> instead of this file."
#endif

#ifndef _AVR_IOXXX_H_
#  define _AVR_IOXXX_H_ "iom16.h"
#else
#  error "Attempt to include more than one <avr/ioXXX.h> file."
#endif

/* Registers and associated bit numbers */

#define TWBR _SFR_IO8(0x00)

#define TWSR _SFR_IO8(0x01)
#define TWPS0 0
#define TWPS1 1
#define TWS3 3
#define TWS4 4
#define TWS5 5
#define TWS6 6
#define TWS7 7

#define TWAR _SFR_IO8(0x02)
#define TWGCE 0
这是文件中的一部分