#include <reg51.h>
#include <string.h>
#include <uart.h>
#include <ST_MR_08S.h>

void init_uart( char Baud ) 
{ 
	SCON = 0x50 ;  //SCON: serail mode 1, 8-bit UART, enable ucvr   //UART為模式1，8位數(shù)據(jù)，允許接收
    TMOD |= 0x20 ; //TMOD: timer 1, mode 2, 8-bit reload             //定時(shí)器1為模式2,8位自動(dòng)重裝
	PCON |= 0x80 ; //SMOD=1; 
	if(Baud==B2400)TH1 = 0xE6;
	else TH1 = 0xF3;   //Baud:4800 fosc=12MHz  BAUND_RATE=2*FOSC/（32*12*(256-TH)） FOSC=晶振頻率，TH=初值	
	IE |= 0x90 ;     //Enable Serial Interrupt 
	TR1 = 1 ;       // timer 1 run 
	TI=0; 
}
//////////////////////////////////////////////////// 
//向串口發(fā)送一個(gè)字符串
void Uart_Send_String (unsigned char *str, unsigned int strlen) 
	 {   
		 unsigned char m = 0; 	
		   do 	
			 { 	   
				  SBUF = *(str + m);  	  
				  while(!TI); 	   
				  TI = 0; 	    	   
				  m ++; 	
			  }while (m < strlen); 
	  } 
//向串口發(fā)送一個(gè)字符 
void Uart_Send_Char(unsigned char chr) 
   {    
   SBUF=chr; 	
   while(!TI); 	 
   TI = 0; 
   } 

//串口接收中斷函數(shù) 
void uart_receive() interrupt 4 using 3 
{ 
    unsigned char chr;
    if (RI) {  
		RI = 0 ; 
	     chr=SBUF;
		Uart_Send_Char(chr);      //echo 
	}
}