slave.c

利用51单片机实现串口多机通信的实验程序

#include<reg51.h>
sbit RE_DE P1^0;
#define COUNT 11
#define ADD 5
unsigned char bdata flag;
unsigned char buffer[COUNT];
unsigned char point;


//UART_init()串口初始化

void UART_init()
{
	SCON=0x0F0;
	TMOD=0x21;
	TH1=0xFA;
	TR1=1;
	SM2=1;
	ET1=0;
	ES=1;
	PS=1;
	EA=1;
}

//com_interrup()串口接收中断处理函数

com_interrup(void) interrupt 4 using 3
{
	unsigned char RECEIVR_buffer;
	if(RI)
	{
		RI=0;
		RECEIVR_buffer=SBUF;
		if(point==0)
		{
			if(RECEIVR_buffer=0xFE)
				buffer[point++]=RECEIVR_buffer;
			else point=0;
		}
		else if(point=1)
		{
			if(RECEIVR_buffer==ADD)
				buffer[point++]=RECEIVR_buffer;
			else point=0;
		}
		else if(point>0&&point<11)
			buffer[point++]=RECEIVR_buffer;
		else point=0;
	}
	if(TI)
	{
		TI=0;
	}
}

//COM_send()串口发送函数

void COM_send(void)
{
	RE_DE=1;
	for(point=0;point<10,TI=1;point++)
	{
		SBUF=buffer[point];
		TI=0;
	}
	RE_DE=0;
}


//主函数

void main(void)
{
	UART_init();
	do
	{
		COM_send();
		SM2=0;
	}
	while (point!=11);
}