interrupt.c

基于51单片机系统

#include <at89x52.h>
#include "define.h"
#include "command.h"


void Timer0()  interrupt 1
{
	static unsigned int n = 0;

	T0_DISABLE;

	if(n<5000)
	{
		n++;
	}
	else
	{
		ShiftLeft();
		n = 0;
	}

	T0_ENABLE;
}

void Serial()  interrupt 4
{
	static bit s_bFlag = 0;	

	INT_DISABLE;

	if(RI)
	{   		
		unsigned char value;

		value = SBUF;

		if(s_bFlag)
		{
		 	SetDDRAM(value);
			s_bFlag = 0;
		}
		else
		{
			switch(value)
			{
				case 0xff:
					SBUF = 0xaa;
					break;
				case 0xa0:
					LCDInitial();
					break;
				case 0xa1:
					ClearScr();
					break;
				case 0xa2:
					T0_RUN;
					break;
				case 0xa3:
					T0_STOP;
					break;
				case 0xa4:
					s_bFlag = 1;
					break;
				default:
					WriteData(value);
					break;			
			}
		}
/*
		if(value==0xff)
		{
			SBUF = 0xaa;
		}

		else
		{
			WriteData(value);
		}
*/
		RI = 0;	  
	}

	if(TI)
	{
		TI = 0;
	}

	INT_ENABLE;
}