hello.c

单片机测试串口通信程序

/*------------------------------------------------------------------------------
HELLO.C

Copyright 1995-2005 Keil Software, Inc.
------------------------------------------------------------------------------*/

#include <REG52.H>                /* special function register declarations   */
/* for the intended 8051 derivative         */

#include <stdio.h>                /* prototype declarations for I/O functions */
#include <stdlib.h>                      /* standard library .h-file          */
#include <ctype.h>                       /* character functions               */
#include <intrins.h>

#ifdef MONITOR51                         /* Debugging with Monitor-51 needs   */
char code reserve [3] _at_ 0x23;         /* space for serial interrupt if     */
#endif                                   /* Stop Exection with Serial Intr.   */



//定义按健
sbit K1 = P3^4;
sbit K2 = P3^5;

sbit LED = P1^0;

sbit P12MOTO=P1^2;

sbit P33=P3^3;




//延时
void delay(unsigned int n)
{	 
  unsigned int i;
   for(i=0;i<n;i++)
   _nop_;

}

 //串口中断
void serial0(void) interrupt 4
{
	unsigned char tmp;

	EA=0;  //关中断

	if(RI)		 //处理接收中断
	{

		tmp=SBUF;
		printf("%bu",tmp);

		RI=0;
	}
	if(TI)		//处理发送中断
	{

		
	 	TI=0;
	}

    EA=1;
}


/*------------------------------------------------
The main C function.  Program execution starts
here after stack initialization.
------------------------------------------------*/
void main (void) {

	unsigned int i;  


#ifndef MONITOR51
	SCON  = 0x50;		        /* SCON: mode 1, 8-bit UART, enable rcvr  101 0000    */
	RCAP2H = 0xFF;
	TH2   = 0xff;                
	RCAP2L =0xBF;
	TL2  =  0xFB;
	T2CON = 0x34;			    //0011 0100
	//TR1   = 1;                  /* TR1:  timer 1 run                          */
	//TI    = 1;                  /* TI:   set TI to send first char of UART    */
	ES  =1;				   //允许串行中断
	EA =1;
#endif


	/*------------------------------------------------
	Note that an embedded program never exits (because
	there is no operating system to return to).  It
	must loop and execute forever.
	------------------------------------------------*/

	//设置
	K1=1;
	K2=1;
	LED =1;	 


}