共阴多机1从机串行校验和.c

单片机C语言15个实验附有原理图和程序 是我的课程作业 以经过实践验证

//computer22.c
#include <stdio.h>
#include <reg51.h>
#include <intrins.h>
sbit clk=P0^7;sbit sda=P0^6;               //74LS164
unsigned  char code ledk[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6D,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
unsigned char sum=0,total,no,buf[10],flag;//sdata[6]={10,11,12,13,14,15};
void delay(unsigned int n)
{unsigned int i;
 for(i=0;i<n;i++);}
/*void hextodec()
 {unsigned int xx;
  disp[3]=disp_value/1000; xx=disp_value%1000;
  disp[2]=xx/100;          xx=xx%100;
  disp[1]=xx/10;           
  disp[0]=xx%10;   }*/
void shift(unsigned char dx)
{static unsigned char d;
   unsigned char j=0;
    d=dx;
   	while(j<8)
	{if((d&0x80)!=0) sda=1;
       else  sda=0;
	   clk=0;clk=1;
	   d<<=1;j++;}  }
//================
void main(void)
{unsigned char i; 
  TMOD=0x20;TH1=0xf3;TL1=0xf3;TR1=1;
  SCON=0xd0;PCON=0x00;P2=0xfe;//TH1=0xcc;TL1=0xcc;
  while(1)
  {aa:P2=0xfe;sum=0;
      do{SM2=1;
         do{}while(!RI);RI=0;}while(SBUF!=0x01);
      TI=0;TB8=0;
      SBUF=0x01;while(!TI);TI=0;SM2=0;
      do{}while(!RI);RI=0;no=SBUF;
      for(i=0;i<=no;i++)
              {do{}while(!RI);RI=0;buf[i]=SBUF;sum=sum+SBUF;}
      do{}while(!RI);RI=0;total=SBUF;
    
     // if(total!=sum){SBUF=0x0c;while(!TI);TI=0;goto aa;}//校验和不等
      //          else{SBUF=0x0d;while(!TI);TI=0;//校验和相等
      for(i=0;i<=no;i++){shift(ledk[buf[i]]);delay(50000);}//显示接收数据
	  delay(50000);	 delay(50000);		   
      shift(ledk[sum/10]|0x80);delay(50000);//显示校验和
	  shift(ledk[sum%10]|0x80);delay(50000);
      shift(0);}}