function.c

单片机P1口与4个按键连接

/*******************************
    双机通信功能实现C源程序
*******************************/
#include "双机通信.h"

void delay_10ms()  //10ms delay routine
{	uint i;
	for(i = 0; i < 10000; i++);
}

void init()       //serial communication initial routine
{	TMOD = 0x20;TH1 = 0xE6;TL1 = 0xE6;TR1 = 1;
	SCON = 0x50;
	EA=1;ES=1;
 }

uchar keyscan()				//keyscan routine
{	uchar temp,keycode = 0;
	P1 = 0xff;
	temp = P1;
	if( temp != 0xff)
	{	delay_10ms();
		temp = P1;
		if( temp != 0xff)
		{	if( P1_0 == 0)		return 1;
			else if (P1_1 == 0)	return 2;
			else if (P1_2 == 0)	return 3;
			else if (P1_3 == 0)	return 4;
			else if (P1_4 == 0)	return 5;
			else if (P1_5 == 0)	return 6; 
			else if (P1_6 == 0)	return 7;
			else				return 8;
		}
	}
	return	0xff;
}

void send(uchar x,uchar *p)  // 串口查询发送程序
{	uchar temp;
	temp = p[x];//	ES=0;EA=0;
	SBUF = temp;
	while( !TI );
	TI = 0;//		    ES=1;EA=1;
}

int_es() interrupt 4  //串口接受中断程序
{	if(RI)
	{	RI = 0;
		P2 = SBUF;
	}
}