Blue Bridge Cup SCM module code (nixie tube) (code + comments)

/* The explanation in the previous chapter will not be repeated */
#include "STC15F2K60S2.H"
#include "stdio.h"
/* contain sprintf function */ 

typedef unsigned char u8;
typedef unsigned int u16;

u8 org[9],tran[9],wei;
u16 count,i;

void close()
{
  P0=0;
  P2=P2&0X1F|0XA0;
  P2=P2&0X1F;
  P0=0XFF;
  P2=P2&0X1F|0X80;
  P2=P2&0X1F;
}

void open()
{
  EA=1;
  ET0=1;
}

void Timer0Init(void)
{
	AUXR |= 0x80;	
	TMOD &= 0xF0;		
	TL0 = 0x20;	
	TH0 = 0xD1;	
	TF0 = 0;		
	TR0 = 1;		
}


void translate(u8 org[],u8 tran[])
{
  u8 k,j,mid;
  for(j=0,k=0;j<8;j++,k++)
/*j Corresponding tran Array ,k Corresponding org Array , Because the nixie tube only 8 individual , Finally, the one-to-one correspondence with the nixie tube is tran Array , therefore j increase 8 Next time , The cycle stops */
  {
	switch(org[k])
	{
      case '0': mid = 0xc0; break;
	  case '1': mid = 0xf9; break;  
	  case '2': mid = 0xa4; break;  
	  case '3': mid = 0xb0; break;  
   	  case '4': mid = 0x99; break;  
	  case '5': mid = 0x92; break;  
	  case '6': mid = 0x82; break;  
	  case '7': mid = 0xf8; break;  
	  case '8': mid = 0x80; break;  
	  case '9': mid = 0x90; break;
      case '-': mid = 0xbf; break;
  	  default: mid = 0xff;
	}
	if(org[k+1]=='.')
	{
	  mid=mid&0x7f;
  	  k++;
	}
/* The eighth digit of the single-chip microcomputer's cathode nixie tube corresponds to the decimal point */
	  tran[j]=mid;
/* Don't forget to write the translation results into tran Array */
  }
}
/* This function is used to set org The contents of the array ‘ translate ’ to tran Array . The connotation of translation is to org The contents in the array are changed into the contents that can be displayed after the SCM reads , And save to tran Array , The principle of transformation refers to the common cathode digital tube */ 

void display(u8 tran[],u8 wei)
{
  P0=0XFF;
  P2=P2&0X1F|0XE0; 
  P2&=0X1F;
/* Blanking , Clear the previous status display , If the SCM display is normal, you can not write */
  P0=1<<wei;
  P2=P2&0X1F|0XC0;
  P2=P2&0X1F;
/* Select a single nixie tube to display */ 
  P0=tran[wei];
  P2=P2&0X1F|0XE0;
  P2=P2&0X1F;
/* Determine the display content in a single nixie tube */
}

void main()
{
  close();
  Timer0Init();
  open();
  while(1)
  {
    translate(org,tran);
	sprintf(org,"    %4u",(u16)i);
/* take i Assigned to the nixie tube %4u,%4u Represents an unsigned integer that occupies four bits in an array ,sprintf Functions generally transfer integers , floating-point 、 Other types of characters are error prone */
  }
}

void stop0() interrupt 1
{
  count++;
  if(count%1000==0)
  {
    i++;
	count=0;
  }
  display(tran,wei);
  if(++wei==8) wei=0;
}
/* Every second i Add 1, So the system implements the timer function ; Every time 1ms Parameters wei Add 1, The digital tube displays the contents back and forth , Because the speed is too fast , The human eye cannot perceive */

Official schematic diagram , The download address of the user manual is as follows ：

link ：https://pan.baidu.com/s/1y8lRYHxLKojL4_r0PZPYRw 
Extraction code ：19so

Note cannot insert picture , Relevant information readers themselves look for in the folder .

Study notes for undergraduate students of Nanjing University of Information Engineering , For your reference .

If there is a mistake , contact QQ3182097183.