串口通信程序.txt

C51串口中断接收和发送程序

#include <reg51.h>
#include <string.h>
#define INBUF_LEN 4   //
unsigned char inbuf1[INBUF_LEN]={5,6,7,8};
unsigned char checksum,count3=0,mama=0x0a,mam=0x0d;
bit           read_flag=0;
int code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
void init_serialcomm(void)
{
 SCON=0x50;       //SCON: serail mode 1, 8-bit UART, enable ucvr
 TMOD=0x20;       //TMOD: timer 1, mode 2, 8-bit reload
 PCON=0x00;       //SMOD=1;
 TH1=253;       //Baud:9600  fosc=12.0MHz
 IE=0x90;       //Enable Serial Interrupt
  TR1=1;          // timer 1 run
 //  TI=1;
}
//向串口发送一个字符
void send_char_com(unsigned char ch)
{
SBUF=ch;
while(TI==0);
 TI=0;
}
//向串口发送一个字符串，strlen为该字符串长度
void send_string_com(unsigned char *str,unsigned int strlen)
{unsigned int k;
k = 0;
do
 {
  send_char_com(str[k]);
 k++;
} while(k < strlen); 

 send_char_com(mam); send_char_com(mama);}

//串口接收中断函数
void serial () interrupt 4 using 3
{
 if(RI)
 {
  unsigned char ch;
  RI = 0;
  ch=SBUF;
  /*if(ch>127)
  {
    count3=0;
    inbuf1[count3]=ch;
    checksum= ch-128;
  }
  else
 { 
 {	*/
   // count3++;
    inbuf1[count3]=ch; 
	count3++;
//	}
//    checksum ^= ch;
    if(count3>=INBUF_LEN) /*&& (!checksum)*/ 
    	{
     read_flag=1;  //如果串口接收的数据达到INBUF_LEN个，且校验没错，
                   //就置位取数标志
				   count3 = 0;
   }
 }
 }


 void delay(unsigned int tim)

{
 unsigned int m;
 for(m=0;m<tim;m++);
 }


void dis(int f,int e,int h,int g)
{
  P0=tab[f];
  P2=0X7F;
   delay(200);
   P0=tab[e];
  P2=0XBF;
   delay(200);
   P0=tab[h];
   P2=0XDF;
   delay(200);
   P0=tab[g];
  P2=0XEF;
   delay(200);
   P2=0XFF;
   }
main()
{
 init_serialcomm();  //初始化串口
	 count3=0;
 while(1)
 {
       if(read_flag)  //如果取数标志已置位，就将读到的数从串口发出
          {
               read_flag=0; //取数标志清0
               send_string_com(inbuf1,INBUF_LEN);
			   }
             dis((inbuf1[0]),(inbuf1[1]),(inbuf1[2]),(inbuf1[3]));
          
 }
}