ATmega8535L Marquee Program (ICC Compiler)

ATmega8535L Marquee Program

//*********************ICCAVR V6.30 compilation**********************// 

#include //Header file, register definition of AT90S8535 microcontroller

#define uchar unsigned char //Data type description 
#define uint unsigned int //Data type descriptionvoid 

DelayMs(uint i) //Ms level delay function, parameter i: delay time 
{uint j; 
 for(;i!=0;i--) 
  {for(j=8000;j!=0;j--) ;} 
} 

void Horse(uchar i) //Marquee program, light up the corresponding LED through step judgment 
{switch(i) //High level lights up the LED 
 {case 1:PORTA=0x01;break; //0000 0001B lights up LED1 
  case 2:PORTA=0x03;break; //0000 0011B lights up LED1~LED2 
  case 3:PORTA=0x07;break; //0000 0111B lights up LED1~LED3 
  case 4:PORTA=0x0f;break; //0000 1111B Light up LED1~LED4 
  case 5:PORTA=0x1f;break; //0001 1111B Light up LED1~LED5 
  case 6:PORTA=0x3f;break; //0011 1111B Light up LED1~LED6 
  case 7:PORTA=0x7f;break; //0111 1111B Light up LED1~LED7 
  case 8:PORTA=0xff;break; //1111 1111B Light up LED1~LED8 
  default:break;} 
} 

void main(void)                
{uchar i; 
 DDRA=0xff; //Port setting: PA port is set to push-pull 1 output 
 PORTA=0xff; 
 PORTA=0x00; //PORTA initial value is 0, turn off all LEDs       
 DelayMs(1000); 
 while(1) //Program is executed unconditionally 
  { for(i=0;i<9;i++) //Light up LED1~LED8 in sequence 
      {Horse(i); 
       DelayMs(1000);} //Lighting time is about 1 second 
    for(i=7;i!=0;i--) //Turn off LED8~LED1 in sequence 
      {Horse(i); 
       DelayMs(1000);} //Turn off time is about 1 second 
  } 
}