51 MCU driver for proximity switch

Today I made a little thing: the digital tube displays the change value of the proximity switch. The proximity switch is connected to the microcontroller through external interrupt 0; the digital tube reading increases to 50 and then clears to zero;

#include // Reference the header file of the standard library

#include

#define uchar unsigned char

#define uint unsigned int

#define NoOp 0x00 // No operation register 

#define Digit0 0x01 // Digital tube 1 register 

#define Digit1 0x02 // Digital tube 2 register 

#define Digit2 0x03 // Digital tube 3 register  

#define Digit3 0x04 // Digital tube 4 register  

#define Digit4 0x05 // Digital tube 5 register  

#define Digit5 0x06 // Digital tube 6 register  

#define Digit6 0x07 // Digital tube 7 register  

#define Digit7 0x08 // Digital tube 8 register  

#define DecodeMode 0x09 // Decode mode register  

#define Intensity 0x0a // Brightness register  

#define ScanLimit 0x0b // Scanning bit number register 

#define ShutDown 0x0c // Low power mode register

#define DisplayTest 0x0f // Display test register

#define ShutdownMode 0x00 // Low power consumption mode  

#define NormalOperation 0x01 // Normal operation mode 

#define ScanDigit 0x07 // Scan digit setting, display 8-digit digital tube

#define DecodeDigit 0xff // Decode setting, all 8 bits are BCD code

#define IntensityGrade 0x0a // Brightness level setting 

#define TestMode 0x01 // Display test mode,

#define TextEnd 0x00 // Display test ends and resume normal working mode

sbit DIN = P0^3; //Serial data input

sbit CLK = P0^4; //Serial clock

sbit LOAD = P0^5; // Display data latch control

uchar DisBuffer[8]={0,0,0,0,0,0,0,0}; //Display buffer 0x06

uchar a[]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09};

uchar num11;

/* Delay t milliseconds*/

void delay(uint a)

{uchar x,y;

  for(x=a;x>0;x--)

  for(y=110;y>0;y--);

} 

/* Write byte (8 bits) to MAX7219 */

void SendChar (uchar ch)

{

    uchar i,temp;

    _nop_();

   for(i=0;i<8;i++)

    {

       temp=ch&0x80;

       ch=ch<<1;

       if(temp)

        {

               DIN=1;

               CLK=0;

               CLK=1;

        }

        else

        {

               DIN=0;

               CLK=0;

               CLK=1;

        }

    }

}

/* Write word (16 bits) to MAX7219 */

void WriteWord (uchar addr,uchar num)

{

    LOAD=0;

    _nop_();

    SendChar(addr);

    _nop_();

    SendChar(num);

    _nop_();

    LOAD=1; //Latch into the corresponding register

}

/* MAX7219 initialization */

void InitDisplay (void)

{

    WriteWord (ScanLimit,ScanDigit); // Set the scan limit

    WriteWord (DecodeMode,DecodeDigit); // Set the decoding mode

    WriteWord (Intensity,IntensityGrade); // Set the brightness

    WriteWord (ShutDown,NormalOperation); // Set to normal working mode

}

//show

// External interrupt 0

void show1(uchar dat)

{uchar shi,ge;

shi=dat/10;

ge=dat%10;

delay(1);

WriteWord (Digit6,a[ge]);

WriteWord (Digit7,a[shi]);

}

/* Main function */

void main(void)

{

     InitDisplay (); // MAX7219 initialization

         IE=0x81;

         IT0=1;

      show1(0);

          WriteWord (Digit1,0xff);

          WriteWord (Digit0,0xff);

      WriteWord (Digit2,0xff);

          WriteWord (Digit3,0xff);

          WriteWord (Digit4,0xff);

          WriteWord (Digit5,0xff);

while(1)

{

        if(num11==50)

    num11=0;

    show1(num11);

}

}

void exint0(void)interrupt 0

{

num11++;

InitDisplay();

delay(1);

show1(num11);

delay(1);

}