/*0832各種波型輸出演示
P1.1 = 0時 P1.0 = 0 正弦波  = 1 鋸齒波　
P1.1 = 1時 P1.0 = 0 方波    = 1 三角波　  =*/

#include <include\reg51.h>
#include <include\ABSACC.H>
#define daport XBYTE[0x8000]
unsigned char i,j,k;
bit updown;  //三角波的上升/下降
unsigned char code sinn[64]={198,204,210,216,222,228,233,237,242,245,249,251,253,255,255,255,
               255,254,252,250,247,243,239,235,230,224,219,213,207,201,194,188,
               181,175,169,163,158,152,147,143,139,136,133,131,129,128,128,128,
               129,130,132,135,138,142,146,151,156,162,168,174,180,186,193,199};
              
void main(void)
{
     updown=0;
     for (i=0;i<10;i++);
     i=128; j=0;
     while(1)
     {
       if (P1_1==1)
       {
          if (P1_0==0) //方波
          {
             if (j<=80) i=255;
             else i=128;
             if (j==160) j=0;
             for (k=0;k<1;k++);
          }
          else  //三角波
          {
             if (updown==0) //上升
             {
               if (i==255) {updown=1;}
               else i++;
             }
             else //下降
             {
               if (i==128) {updown=0;}
               else i--;
             }
          }
       }
       else
       {
          if (P1_0==0) //正弦波
          {//i=sin(j);
             i=sinn[j];
             if (j==63) j=0;
             for (k=0;k<6;k++);
          }
          else //鋸齒波
          {
             for (k=0;k<1;k++);
             if (i==255) i=128;
             else i++;
          }
       }
       daport=i;
       for (k=0;k<1;k++);
       j++;
     }
}