int2.c

5402DSP程序设计语言

interrupt void int2c(); 
extern void initial();
extern void	porta();
extern void portb();

int flag=0;

main()
{
	initial();
	while(1){;}
}             

interrupt void int2c()
{   
	asm("nop");  
	*(int *)0x300=*(int *)0x300+2;	/*break here to show if interrupt happened*/
	if(flag==0)
	{
		flag=1;
		porta();
	}
	else
	{
		flag=0;      
		portb();
	}
}