Keyboard display module debugger

The flowchart of  keyboard display module debugging  is shown in the figure below:
 #include  
#include  
#define com XBYTE[0X9FFF] ；8279 command entry address 
#define dat XBYTE[0x9eff] ；8279 data entry address

#define uchar unsigned char 
#define uint unsigned int 
sbit cflag=ACC^7; 
uchar j=0,sq; 
uchar code keytab[16]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08, 0x09, 
                       0x0a,0x0b,0x0c,0x0d,0x0e,0x0f}; ；Key code table 
uchar code tab[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77, 
                    0x7c ,0x39,0x5e,0x79,0x71}; ; glyph table 
void delay(uint t); ; Delay function 
void clr(); ; Clear 8279 RAM data 
void serve(); ; 8279 interrupt service function 

void main (void) ; Main function 
     {uint i; 
      com=0xd1; ; Send clear instruction 
      do{ACC=com;} 
      while(cflag!=0); ；Check the status register DU until DU is zero 
      com=0x34; ；Calibration value 20 
      com=0x10; ；Write 8279 working mode: input from the left end, 8 characters are displayed 
      delay(200); ； Delay 
      com=0x90; ;Write to 8279 display RAM starting unit 0, automatically add 1 
      EA=1; ;Open interrupt 
      EX0=1; 
IT0=1; 
     do{} 
     while(1); ;Wait for key interrupt 
   } 
void serve () interrupt 0 ；interrupt service function 
  { 
       uint i; 
       com=0x40; ；read the key value in FIFO 
       sq=dat&0x3f; ;Retain the key code part 
       for(i=0;i<16;i++) 
           {if(sq==keytab[i]) break; ;Check the key code table 
                 } 
                    dat=tab[i]; ;Check the glyph table and convert the key The value is sent to the display 
  } 
void delay(uint t); delay function 
    {uint i,j; 
      for(i=0;i         for(j=0;j<100;j++); 
    } 
void clr( void); Clear 8279 display RAM data function  
  {com=0xd1; 
   do{ACC=com;} 
     while(cflag!=0); 
     j=0; 
     com=0x90; 
     dat=0x40; 
   } 
During the test, each key is pressed , the digital tube displays the corresponding value, which means the debugging is successful.