ÿþ#include



sbit   sda = P1^0;

sbit   scl = P1^1;

sbit   back_light_switch = P1^2;



// 

unsigned char code num_table[16]={0xd7,0x03,0xb6,0xa7,0x63,0xe5,0xf5,0x07,0xf7,0xe7,0x77,0xf1,0xd4,0xb3,0xf4,0x74};



//

void delay_char(unsigned char t)

{

    while(--t);

}

//===================================

void write(unsigned char  dat)

{

    unsigned char i;

       

    for(i = 0;i < 8; i++)

    {

        scl = 0;

        sda = (dat << i) & 0x80;

        scl = 1;

    }

   

    scl = 0;scl = 0;

    scl = 1;scl = 1;scl = 1;

    scl = 0; 

}

//============================

void start(void)

{

    sda = 1;

    scl = 1;

    sda = 0;

    scl = 0;

    write(0x70);

}

//==============================



void stop(void)

{

    sda = 0;

    scl = 1;

    sda = 1;

}

//================================



void display(float dat)

{

    unsigned long  temp;

    char i,sum;

    unsigned char num[8]= {0};  //

  

    if(dat < 0)

    {

        dat = - dat;

        num[7] = 0x20;  //

    }



    else

    {

        num[7] = 0;     //

    }





       

        start();

        write(0x48);    //

        stop();

   

        start();

        write(0xe0);    //

        write(0);        //

      //  stop();

     //   start();

          



    if(dat < 100000 ) //

    {

       

        temp = 100 * dat;       //

        num[6] = temp / 1000000;

        num[5] = temp / 100000 %10;

        num[4] = temp / 10000 %10;

        num[3] = temp / 1000 %10;

        num[2] = temp / 100 %10;

        num[1] = temp / 10 %10;

        num[0] = temp %10;

       

        sum = 0;

        for(i = 6;i >2;i--) //

        {

            sum = num[i] + sum;

            if(sum > 0) break;

        }

        sum = i;    //

       

        for(i = 0;i <= sum;i++)   //

        {

            num[i] = num_table[num[i]];

        }

            num[sum + 1] = num[7];  //

            num[2] = num[2] | 0x08; //

           

       

        for(i = 0; i < 14-sum; i++)  //

        {

            write(0);

        }

      

        for(i = sum +1; i >= 0 ;i--) //

        {

            write(num[i]);

        }

    }



    else    //

    {

        for(i = 0; i < 16; i++)

        {

            write(0x20);

        }   

    }

    write(0);           //

    stop();      //

}

//================================



void main()

{

   float i;

   unsigned char k;



 //   while(1)display(-99999.99);

  

   while(1)

   {

        for(i = -1.10;i<100100;i = i + 0.01)

        {

            display(i);

            for(k = 0;k <250;k ++)

            {

                delay_char(250);

            }

        }

   

    } 

}



/******************************************************/



#include 



sbit   sda = P1^0;

sbit   scl = P1^1;



//                                 H     E    L    L    0



unsigned char code num_table[17]={0x73,0xf4,0xd0,0xd0,0xd7,0x00,0x00,0x00,

         

      0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

        

      0x00}; 



void stop(void);

void start(void);

void display(void);

void write(unsigned char  dat);

void delay_char(unsigned char t);

void main()

{

   while(1)display();

}

void write(unsigned char  dat)

{

    unsigned char i;

      

    for(i = 0;i < 8; i++)

    {

        scl = 0;

        sda = (dat << i) & 0x80;

        scl = 1;

    }

  

    scl = 0;scl = 0;

    scl = 1;scl = 1;scl = 1;

    scl = 0;

}

//============================



void start(void)

{

    sda = 1;

    scl = 1;

    sda = 0;

    scl = 0;

    write(0x70);           //

}

//==============================

 

void stop(void)

{

    sda = 0;

    scl = 1;

    sda = 1;



}

//================================



void display(void)

{



    char i;



        

        start();

        write(0x48);    //

        stop();

  

        start();

        write(0xe0);    //

        write(0);        //



        for(i = 0; i <16; i++)

        {

            write(num_table[i]);

        }  

 

    write(0);          

    stop();      //

}

//================================



void delay_char(unsigned char t)

{

    while(--t);

}

//===================================