51串口通信

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我能补个程序吗？

//**********************************************

就是这个程序，有问题

#include<reg52.h>
#include<intrins.h>

typedef unsigned int uint;
typedef unsigned char uchar;
uchar R_data;
bit R_flag = 0;
uchar code f[] = "error";
uchar code t[] = "true";
uchar code st[] = "Please input your key:";
uchar code st2[] = "The key is:";
uchar code st3[] = "请输入密码以解锁：  \n";
char key[10]={"******"};///  \0\0\0\0\0
char *p*l;
uchar j=0i = 0n=0;

int delay(unsigned int a) {


	while (a--);

	return 0;
}

void Start()
{
	TMOD = 0x20;   //定时器工作在定时器1的方式2
	PCON = 0x00;   //不倍频
	SCON = 0x50;	//串口工作在方式1，并且启动串行接收	
	TH1 = 0xfd;    //设置波特率 9600
	TL1 = 0xfd;		//模式2 8位自动刷新   TL1 = TH1		
	TR1 = 1;		//启动定时器1
	EA = 1;		//开总中断	
	ES = 1;		//开串口中断
	
}

//发送
void send_out(int a)
{
	switch (a)
	{
	case 1:
		p = st;
		while (1)
		{

			SBUF = *p;
			while (!TI)
			{
				_nop_();
			}
			p++;
			if (*p == '\0') break;
			TI = 0;
			
		}

		break;

	case 2:


		p = st2;
		while (1)
		{

			SBUF = *p;
			while (!TI)
			{
				_nop_();
			}
			p++;
			if (*p == '\0') break;
			TI = 0;

		}

		p = key;
		while (1)
		{

			SBUF = *p;
			while (!TI)
			{
				_nop_();
			}
			p++;
			if (*p == '\0') break;
			TI = 0;

		}
	}	
}

//接受中断
void Start1(void) interrupt 4
{
	
	EA = 0;
	if (RI == 1)   //当硬件接收到一个数据时，RI会置位
	{

		
		key[j] = SBUF;
		j++;
		
		
		RI = 0;
		R_flag = 1;
		i = 0;
	
	}
	EA = 1;
	
}

void main()
{

	Start();
	j = 0;
	send_out(1);
	i = 1;
	while (i);


	while (1)
	{
			  j=0;
			if (R_flag == 1)
			{
				
				send_out(2);
				R_flag = 0;
			}
			
		
	}
}