流水灯实验a.i

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/*****************************************************
CodeWizardAVR V1.24.8d Professional
实验板硬件配置:
1:使用内部时钟
2:所有跳线开路
3:用8根线把PB0-PB7分别连接到8个LED上（LED自备）
*****************************************************/
// CodeVisionAVR C Compiler
// (C) 1998-2004 Pavel Haiduc, HP InfoTech S.R.L.

// I/O registers definitions for the ATmega48(V)


#pragma used+
sfrb PINB=3;
sfrb DDRB=4;
sfrb PORTB=5;
sfrb PINC=6;
sfrb DDRC=7;
sfrb PORTC=8;
sfrb PIND=9;
sfrb DDRD=0xa;
sfrb PORTD=0xb;
sfrb TIFR0=0x15;
sfrb TIFR1=0x16;
sfrb TIFR2=0x17;
sfrb PCIFR=0x1b;
sfrb EIFR=0x1c;
sfrb EIMSK=0x1d;
sfrb GPIOR0=0x1e;
sfrb EECR=0x1f;
sfrb EEDR=0x20;
sfrb EEARL=0x21;
sfrb EEARH=0x22;
sfrw EEAR=0x21;   // 16 bit access
sfrb GTCCR=0x23;
sfrb TCCR0A=0x24;
sfrb TCCR0B=0x25;
sfrb TCNT0=0x26;
sfrb OCR0A=0x27;
sfrb OCR0B=0x28;
sfrb GPIOR1=0x2a;
sfrb GPIOR2=0x2b;
sfrb SPCR=0x2c;
sfrb SPSR=0x2d;
sfrb SPDR=0x2e;
sfrb ACSR=0x30;
sfrb MONDR=0x31;
sfrb SMCR=0x33;
sfrb MCUSR=0x34;
sfrb MCUCR=0x35;
sfrb SPMCSR=0x37;
sfrb SPL=0x3d;
sfrb SPH=0x3e;
sfrb SREG=0x3f;
#pragma used-


// Interrupt vectors definitions


// Needed by the power management functions (sleep.h)
#asm
	#ifndef __SLEEP_DEFINED__
	#define __SLEEP_DEFINED__
	.EQU __se_bit=0x01
	.EQU __sm_mask=0x0E
	.EQU __sm_adc_noise_red=0x02
	.EQU __sm_powerdown=0x04
	.EQU __sm_powersave=0x06
	.EQU __sm_standby=0x0C
	.SET power_ctrl_reg=smcr
	#endif
#endasm


// CodeVisionAVR C Compiler
// (C) 1998-2000 Pavel Haiduc, HP InfoTech S.R.L.


#pragma used+

void delay_us(unsigned int n);
void delay_ms(unsigned int n);

#pragma used-


void main(void)
{ 
  unsigned char data=1;              //定义一个变量data  
  DDRB=255;                          //设置PB口全部IO为输出
  PORTB=0;                           //全部IO输出低电平
  
while (1)                            //条件是(真) ,所以循环
      {         
         while(data!=128)            //如果data不等于128就循环
              {
                  PORTB=data;        //在PB端口输出变量data
                  data<<=1;          //变量data向左移动1位并保存
                  delay_ms(1000);    //延时一段时间
              }
              
         while(data!=1)              //与上面相似
              {
                  PORTB=data;
                  data>>=1;
                  delay_ms(1000);
              }
      };
}