用AVR实现简单按键的程序与proteus的结合

				#line 1 "F:\电子设计\proteus\RUNNIN~1\main.c"
				
				
				
				
				
				
				
				
				
				
				
				
				
				
				void port_init(void)
				{
				 PORTA = 0x0F;
				 DDRA  = 0x0F;
				 PORTB = 0x0F;
				 DDRB  = 0x00;
				 PORTC = 0x00;
				 DDRC  = 0x00;
				 PORTD = 0xFF;
				 DDRD  = 0x05;
				}
				
				
				void init_devices(void)
				{
				
				 CLI();
				 port_init();
				
				 MCUCR = 0x00;
				 GICR  = 0x00;
				 TIMSK = 0x00;
				 SEI();
				
				}
				
				void delay(void)
				{
				 unsigned char i;
				 for(i=254;i!=0;i--)
				 {
				  asm("nop");
				 }
				}
				
				void main(void)
				{
				 unsigned char temp;
				 init_devices();
				 while(1)
				 {
				  temp=PINB;
				  delay();
				  if(temp==PINB)
				  {
				  PORTA=PINB;
				  }
				 }
				}