c程序.txt

串口是目前最常用的一种串行通讯接口它是在年由美国电子工业协会联合贝尔系统调制解调器厂家及计算机终端生产厂家共同制定的用于串行通讯的标准

#include <STC516.H>
#include <absacc.h>
#include <intrins.h>          //_nop_();
#define Reg8255 XBYTE[0x8003]
#define Reg8255A XBYTE[0x8000]
#define Reg8255B XBYTE[0x8001]
#define Reg8255C XBYTE[0x8002]
#define uchar unsigned char
uchar  con1ms=0,conkey=0,con=0,keyval=0,serval,f=0;
int con1s=0;
uchar led[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar scan[]={0x80,0x40,0x08,0x04,0x20,0x10,0x02,0x01},datas[4];
struct
  {
   uchar sec;
   uchar min;
   }clk={0,0}; 
void Init_T(void)
{
 TMOD=0x21;      
 TH0=0xF8;TL0=0xCC;
 TH1=0xFA;TL1=0xFA;
 TR0=1;TR1=1;
 ET0=1;ET1=1;
 }
void Init_UART(void)
{
 SCON=0x50;     
 PCON=0x00;
 TI=0;RI=0;
 ES=1;
 }
void Init(void)
{
 Reg8255=0x89;Reg8255A=0x00;Reg8255B=0x00;Reg8255C=0xFF;
 Init_T();Init_UART();
 EA=1;
 }
void display(uchar X,uchar B)
{
 Reg8255A=0x00;
 Reg8255B=0x00;
 _nop_();_nop_();
 Reg8255B=led[X];
 Reg8255A=scan[B];
 }
void CLK(uchar A)
{
 datas[3]=clk.sec%10;
 datas[2]=clk.sec/10;
 datas[1]=clk.min%10;
 datas[0]=clk.min/10;
 _nop_();_nop_();
 display(datas[A],A);
 }
void keyscan(void)
{
 uchar key;
 key=(~Reg8255C)&0x0F;
 if(key!=0)
   {
    while(((~Reg8255C)&0x0F)!=0) CLK(con1ms);
    keyval=key;
    }
 }
void serput(void)
{
 SBUF=clk.sec;
 }
void serget(void)
{
 if(serval==1) f=1;
 if(serval==0) f=0;
 }
void main(void)
{
 Init();
 while(1)
   { 
    CLK(con1ms);
    if(conkey==1)
      {
       keyscan();
       conkey=0;
       }
    switch(keyval)
	  {
	   case 1: {serput();break;}
	   case 2: {serget();break;} 
	    default : break;
		}
    }
 }
void time_T0(void) interrupt 1 
{
 EA=0;
 ET0=0;TR0=0;TH0=0xF8;TL0=0xCC;TR0=1;
 con1ms++;con++;con1s++;
 if(con1ms>3) con1ms=0;
 if(con>99)
   {
    con=0;
    conkey=1;
    }
 if(f==0)
 if(con1s>999)
   {
    con1s=0;
	clk.sec++;
	if(clk.sec>59)
	  {
	   clk.sec=0;
	   clk.min++;
	   if(clk.min>59)
	     clk.min=0;
	   }
	 }
 ET0=1;
 EA=1;
 }
void Serial(void) interrupt 4
{
 if(TI==1) TI=0;
 if(RI==1) 
   {
    RI=0;serval=SBUF;
	}
 }