好吧，不得不承认，我使用飞思卡尔的XS128单片机已经非常之习惯了，结果一上手atmega8，最令我反感的就是atmega8不能对IO引脚进行操作，非要用些繁琐的位操作。我就不，我就要像飞思卡尔那样操作。。。
于是。。。。。。
把我写的下面这个头文件塞到winavr目录的include/avr中，并在io.h头文件的最后包含这个头文件。
嘿嘿，一切变得是那么的亲切与熟悉。。。。。。
/***********************************************************
* 函数库说明：ATMEGE8
* 版本： v1.0
* 修改： 庞辉 芜湖联大飞思卡尔工作室
* 修改日期： 2011年08月04日
*
* 说明： 无
*
* 版本更新：
*
************************************************************
*注意： 无
***********************************************************/
#ifndef _BIT_
#define _BIT_
//定义一个8字节的位段 bit0~7是每个位段名称 1代表一位 PBIT就是整个位段的名称
typedef struct
{
unsigned bit0 : 1 ;
unsigned bit1 : 1 ;
unsigned bit2 : 1 ;
unsigned bit3 : 1 ;
unsigned bit4 : 1 ;
unsigned bit5 : 1 ;
unsigned bit6 : 1 ;
unsigned bit7 : 1 ;
}PBIT;
//强制转换
#define PORTABIT (*(volatile PBIT *)0x3B)
#define DDRABIT (*(volatile PBIT *)0x3A)
#define PINABIT (*(volatile PBIT *)0x39)
#define PORTBBIT (*(volatile PBIT *)0x38)
#define DDRBBIT (*(volatile PBIT *)0x37)
#define PINBBIT (*(volatile PBIT *)0x36)
#define PORTCBIT (*(volatile PBIT *)0x35)
#define DDRCBIT (*(volatile PBIT *)0x34)
#define PINCBIT (*(volatile PBIT *)0x33)
#define PORTDBIT (*(volatile PBIT *)0x32)
#define DDRDBIT (*(volatile PBIT *)0x31)
#define PINDBIT (*(volatile PBIT *)0x30)
//继续封装
#define PORTA_PA0 PORTABIT.bit0
#define PORTA_PA1 PORTABIT.bit1
#define PORTA_PA2 PORTABIT.bit2
#define PORTA_PA3 PORTABIT.bit3
#define PORTA_PA4 PORTABIT.bit4
#define PORTA_PA5 PORTABIT.bit5
#define PORTA_PA6 PORTABIT.bit6
#define PORTA_PA7 PORTABIT.bit7
#define PORTB_PB0 PORTBBIT.bit0
#define PORTB_PB1 PORTBBIT.bit1
#define PORTB_PB2 PORTBBIT.bit2
#define PORTB_PB3 PORTBBIT.bit3
#define PORTB_PB4 PORTBBIT.bit4
#define PORTB_PB5 PORTBBIT.bit5
#define PORTB_PB6 PORTBBIT.bit6
#define PORTB_PB7 PORTBBIT.bit7
#define PORTC_PC0 PORTCBIT.bit0
#define PORTC_PC1 PORTCBIT.bit1
#define PORTC_PC2 PORTCBIT.bit2
#define PORTC_PC3 PORTCBIT.bit3
#define PORTC_PC4 PORTCBIT.bit4
#define PORTC_PC5 PORTCBIT.bit5
#define PORTC_PC6 PORTCBIT.bit6
#define PORTC_PC7 PORTCBIT.bit7
#define PORTD_PD0 PORTDBIT.bit0
#define PORTD_PD1 PORTDBIT.bit1
#define PORTD_PD2 PORTDBIT.bit2
#define PORTD_PD3 PORTDBIT.bit3
#define PORTD_PD4 PORTDBIT.bit4
#define PORTD_PD5 PORTDBIT.bit5
#define PORTD_PD6 PORTDBIT.bit6
#define PORTD_PD7 PORTDBIT.bit7
//**********************
#define DDRA_DDRA0 DDRABIT.bit0
#define DDRA_DDRA1 DDRABIT.bit1
#define DDRA_DDRA2 DDRABIT.bit2
#define DDRA_DDRA3 DDRABIT.bit3
#define DDRA_DDRA4 DDRABIT.bit4
#define DDRA_DDRA5 DDRABIT.bit5
#define DDRA_DDRA6 DDRABIT.bit6
#define DDRA_DDRA7 DDRABIT.bit7
#define DDRB_DDRB0 DDRBBIT.bit0
#define DDRB_DDRB1 DDRBBIT.bit1
#define DDRB_DDRB2 DDRBBIT.bit2
#define DDRB_DDRB3 DDRBBIT.bit3
#define DDRB_DDRB4 DDRBBIT.bit4
#define DDRB_DDRB5 DDRBBIT.bit5
#define DDRB_DDRB6 DDRBBIT.bit6
#define DDRB_DDRB7 DDRBBIT.bit7
#define DDRC_DDRC0 DDRCBIT.bit0
#define DDRC_DDRC1 DDRCBIT.bit1
#define DDRC_DDRC2 DDRCBIT.bit2
#define DDRC_DDRC3 DDRCBIT.bit3
#define DDRC_DDRC4 DDRCBIT.bit4
#define DDRC_DDRC5 DDRCBIT.bit5
#define DDRC_DDRC6 DDRCBIT.bit6
#define DDRC_DDRC7 DDRCBIT.bit7
#define DDRD_DDRD0 DDRDBIT.bit0
#define DDRD_DDRD1 DDRDBIT.bit1
#define DDRD_DDRD2 DDRDBIT.bit2
#define DDRD_DDRD3 DDRDBIT.bit3
#define DDRD_DDRD4 DDRDBIT.bit4
#define DDRD_DDRD5 DDRDBIT.bit5
#define DDRD_DDRD6 DDRDBIT.bit6
#define DDRD_DDRD7 DDRDBIT.bit7
//*****************
#define PINA_PA0 PINABIT.bit0
#define PINA_PA1 PINABIT.bit1
#define PINA_PA2 PINABIT.bit2
#define PINA_PA3 PINABIT.bit3
#define PINA_PA4 PINABIT.bit4
#define PINA_PA5 PINABIT.bit5
#define PINA_PA6 PINABIT.bit6
#define PINA_PA7 PINABIT.bit7
#define PINB_PB0 PINBBIT.bit0
#define PINB_PB1 PINBBIT.bit1
#define PINB_PB2 PINBBIT.bit2
#define PINB_PB3 PINBBIT.bit3
#define PINB_PB4 PINBBIT.bit4
#define PINB_PB5 PINBBIT.bit5
#define PINB_PB6 PINBBIT.bit6
#define PINB_PB7 PINBBIT.bit7
#define PINC_PC0 PINCBIT.bit0
#define PINC_PC1 PINCBIT.bit1
#define PINC_PC2 PINCBIT.bit2
#define PINC_PC3 PINCBIT.bit3
#define PINC_PC4 PINCBIT.bit4
#define PINC_PC5 PINCBIT.bit5
#define PINC_PC6 PINCBIT.bit6
#define PINC_PC7 PINCBIT.bit7
#define PIND_PD0 PINDBIT.bit0
#define PIND_PD1 PINDBIT.bit1
#define PIND_PD2 PINDBIT.bit2
#define PIND_PD3 PINDBIT.bit3
#define PIND_PD4 PINDBIT.bit4
#define PIND_PD5 PINDBIT.bit5
#define PIND_PD6 PINDBIT.bit6
#define PIND_PD7 PINDBIT.bit7
#endif