7219 chip drives LED electronic clock

/***************The clock adopts the timed interrupt mode, 50MS once******Completely available, the hardware experiment passed**********************/
#include             
#include        
#include
/***********************************************************************/
#define uchar unsigned char
#define uint unsigned int
//common part 
#define HIGH 1
#define LOW 0
#define TRUE 1
#define FALSE 0
#define ZERO 0 
#define MSB 0x80
#define LSB 0x01
//max7219 part
#define REG_NO_OP 0x00 // Define no operation
#define DIG_1 0x01 // Define digital tube 1 
#define DIG_2 0x02 // Define digital tube 2 
#define DIG_3 0x03 // Define digital tube 3 
#define //  MAX7219 Load-Data Input: rising edge pin 12 sbit DIN=P2^5; //MAX7219 12bit LOAD  =  P2 
^  7  ;  //  MAX7219  Load  -  Data Input: rising edge pin 12  sbit DIN=P2^5; // MAX7219 Serial-Data Input: rising edge pin 1 sbit CLK=P2^6; //MAX7219  sbit TT=P1^4; sbit QQ=P3^6; sbit RR=P3^7; //function define /*****************************************************************/ void Write_Max7219_byte(unsigned char temp);//write max7219 a byte void Write_Max7219(unsigned char address,unsigned char dat);//write max7219 command and data void Init_Max7219(void);//Initize max7219 //test program display from 1~8 /****************************************************************************/ /***********************************************************************/ void Write_Max7219_byte(unsigned char temp) {  unsigned char i;  for (i=0;i<8;i++)        {     CLK=LOW;      DIN=(bit)(temp&MSB);            temp<<=1;       CLK=HIGH;    } } /**********************************************************************/ void Write_Max7219(unsigned char address,unsigned char dat) {   LOAD=LOW;    Write_Max7219_byte(address);     Write_Max7219_byte( dat);   LOAD=HIGH;                  }












































/****************************************************** ************************/
void Init_Max7219(void)      
{ 
 Write_Max7219(SHUT_DOWN, 0x01); //Normal Operation XXXXXXX1 Shutdown Mode XXXXXXXX0
 Write_Max7219(DISPLAY_TEST, 0x00)
 ;  //   Normal
 Operation
, 0x04); 
 Write_Max7219(DIG_4,0x02); Write_Max7219(DIG_3,0x01);
 Write_Max7219(DIG_6,0x07); Write_Max7219(DIG_5,0x05);
 Write_Max7219(DIG_7,0x01);
}
     
/****************************** ******************************/
void init(void)     
{      
TMOD=0x01;    
TH0=-(50000/256);   
TL0=-( 50000%256);  
ET0=1;     
TR0=1;     
EA=1; 
TT=0;
QQ=0;
RR=0;
Init_Max7219();    
}      
/****************** ***************************/
void time0(void) interrupt 1   
{      
TH0=-(50000/256);   
TL0=-(50000 %256);  
deda++;     
}            
/******************************************/
void conv (void)   
{      
if(deda>=20){deda=0;sec++;Write_Max7219(DIG_8,sec%10); Write_Max7219(DIG_7,sec/10); }
if(sec>=60){sec=0;min++; Write_Max7219(DIG_6 ,min%10); Write_Max7219(DIG_5,min/10);}  
if(min>=60){min=0;hour++; Write_Max7219(DIG_4,hour%10); Write_Max7219(DIG_3,hour/10);} 
if (hour>=24){hour=0;week++; Write_Max7219(DIG_2,week%10);} 
if(week>7){week=1;} 
if(hour==3) TT=1;  
}      
/** ***************************************/
void delay(uint k)   
{     
uint data i,j;   
for(i=0;ifor(j=0;j<121;j++)  
{;}}     
}     
/**************** *********************************/
uchar scan_key(void) 
{     
uchar temp;
P3=0x3f;   
temp=P3 ;    
if(temp!=0x3f)  
   {delay(20);  
    temp=P3;   
   if(temp!=0x3f) return temp;
    }     
return 0x3f;
}
/**************** ****************************/
void main(void)   
{uchar key_flag;  
 init();    
 while(1)   
 {     
 conv() ; 
 key_flag=scan_key();   
 switch(key_flag)  
    {     
    case 0x3b:if(++min>59)min=0; delay(300); Write_Max7219(DIG_6,min%10); Write_Max7219(DIG_5,min/10);break;
    case 0x37:if(++hour>23)hour=0; delay(300);Write_Max7219(DIG_4,hour%10); Write_Max7219(DIG_3,hour/10);break ;      
    case 0x2f:if(++week>7 )week=1; delay(300); Write_Max7219(DIG_2,week%10);break;
    default: break; 
    }     
 }     
}