90showtime.c

单片机开发资料光盘-双龙-686M.zip

#include<io8515.h>
#pragma interrupt_handler uart_rec:10
#define clrcs     PORTC&=~0x10;   
#define setcs     PORTC|=0x10;
#define clrclk    PORTC&=~0x08;
#define setclk    PORTC|=0x08;

void delay(unsigned char mst)  //延时子程序
 {  unsigned char i;
     for (i = 1; i<mst; i++)
			;
 }

void send(unsigned char temp)  //发送子程序
{
 unsigned char i;
 clrcs
 delay(150);
 clrclk
 for(i=8;i>0;i--)
  {
   PORTC=(temp&0x80)?PORTC|0x04:PORTC&0xfb;
   setclk
   delay(10);
   clrclk
   delay(10);
   temp=temp<<1;
  }
 PORTC&=~0x04;  
} 

void write279(unsigned char cmd1, unsigned char cmd2)
{
	send(cmd1);
	send(cmd2);                              
	setcs;
}

 
void distime(unsigned char temp[],unsigned n)    
{ 
  write279(0xcf,temp[0]/10);
  write279(0xce,temp[0]%10);
  write279(0xcc,temp[1]/10);
  write279(0xcb,temp[1]%10);
  write279(0xc9,temp[2]/10);
  write279(0xc8,temp[2]%10);
}

 
void main()
{
 unsigned char i,j;
 DDRC=0xfd;
 PORTC=0xf7;
 send(0xa4);
 setcs
 write279(0x92,1);
 write279(0x95,1);
 UBRR=25;
 UCR=0x90;
 SREG|=0x80;
 while(1);
}

void uart_rec()             
{
 unsigned char rec,time[3],*timepoint;
 timepoint=time;
next:
 USR&=~0x80;
 if((USR&0x10)==1) return;
 rec=UDR;
 if(rec==13) goto dis;
 *timepoint=rec;
 ++timepoint;
 while(!(USR&0x80));
 goto next;
dis: 
 distime(time,3);
}