#include <absacc.h>

 #include <reg52.h>

 #define DA0832 P2

 #define DATA 57          //定时器延时 

 #define uchar unsigned char

 #define uint unsigned int

 sbit S1 = P1^;

 sbit S2 = P1^;

 //00锯齿波；01方波；10三角波；11正弦波

 uchar code sin_tab[] =        //正弦波输出表

 {

      0x80,0x83,0x86,0x89,0x8D,0x90,0x93,0x96,0x99,0x9C,0x9F,0xA2,0xA5,0xA8,0xAB,0xAE,

      0xB1,0xB4,0xB7,0xBA,0xBC,0xBF,0xC2,0xC5,0xC7,0xCA,0xCC,0xCF,0xD1,0xD4,0xD6,0xD8,

      0xDA,0xDD,0xDF,0xE1,0xE3,0xE5,0xE7,0xE9,0xEA,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4,0xF5,

      0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,

      0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFD,0xFC,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6,

      0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEA,0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,0xDD,0xDA,

      0xD8,0xD6,0xD4,0xD1,0xCF,0xCC,0xCA,0xC7,0xC5,0xC2,0xBF,0xBC,0xBA,0xB7,0xB4,0xB1,

      0xAE,0xAB,0xA8,0xA5,0xA2,0x9F,0x9C,0x99,0x96,0x93,0x90,0x8D,0x89,0x86,0x83,0x80,

      0x80,0x7C,0x79,0x76,0x72,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x55,0x51,

      0x4E,0x4C,0x48,0x45,0x43,0x40,0x3D,0x3A,0x38,0x35,0x33,0x30,0x2E,0x2B,0x29,0x27,

      0x25,0x22,0x20,0x1E,0x1C,0x1A,0x18,0x16,0x15,0x13,0x11,0x10,0x0E,0x0D,0x0B,0x0A,

      0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,

      0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,

      0x0A,0x0B,0x0D,0x0E,0x10,0x11,0x13,0x15,0x16,0x18,0x1A,0x1C,0x1E,0x20,0x22,0x25,

      0x27,0x29,0x2B,0x2E,0x30,0x33,0x35,0x38,0x3A,0x3D,0x40,0x43,0x45,0x48,0x4C,0x4E,

      0x51,0x55,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x72,0x76,0x79,0x7C,0x7E

 };

 void stair(void);//锯齿波

 void square(void);//方波

 void trian();//三角波

 void sin();//正弦波

 void scan();//扫描函数

 void Timer0Init(void);        //75微秒@11.0592MHz

 uchar flag = ;

 void main()

 {

     P2 = 0xff;

     Timer0Init();

     while()

     {

     //逐个测试

     //stair();        /*锯齿波*/

     //    square();  /*方波*/

   // trian();    /*三角波*/

     //    sin();  /*正弦波*/

     scan();

     }

 }

 void Timer0Init(void)        //75微秒@11.0592MHz

 {

     TMOD = 0x01;        //设置定时器模式

     TH0  = ( - DATA) / ;        //设置定时初值

     TL0  = ( - DATA) % ;        //设置定时初值

     ET0  = ;            //TF0标志

     TR0  = ;            //定时器0开始计时

     EA   = ;

 }

 void timer0_ISR(void) interrupt

 {

     TH0  = ( - DATA) / ;        //设置定时初值

     TL0  = ( - DATA) % ;        //设置定时初值

     TR0  = ;

     flag = ;

 }

 void scan()

 {

     if(( == S1) &&( == S2))

         stair();

     else if(( == S1) && ( == S2))

         square();

     else if(( == S1) && ( == S2))

         trian();

     else

         sin();

 }

 void stair(void)

 {

     uchar i;

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

     {

       DA0832 = i;

         TR0  = ;

         while(flag == );

         flag = ;

     }

 }

 void square(void)

 {

     int i;

     DA0832 = 0xff;

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

     {

         TR0  = ;

         while(flag == );

         flag = ;

     }

     DA0832 = 0x00;

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

     {

         TR0  = ;

         while(flag == );

         flag = ;

     }

 }

 void trian(void)

 {

     uchar i;

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

     {

         DA0832 = i;

             TR0  = ;

           while(flag == );

           flag = ;

     }

     for(i= ;i > ; i--)

     {

         DA0832 = i;

           TR0  = ;

           while(flag == );

           flag = ;

     }

 }

 void sin()

 {

     uchar i;

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

     {

         DA0832 = sin_tab[i];

         TR0  = ;

         while(flag == );

         flag = ;

     }

 }