/*0832各種波型輸出演示，同時(shí)使用0809采樣W1電壓來調(diào)整波頻率，用74LS164來顯示W(wǎng)1電壓值(延時(shí)值).
接線方法為0832實(shí)驗(yàn)+0809實(shí)驗(yàn)(去掉273部分)+串并轉(zhuǎn)換實(shí)驗(yàn)
P1.1 = 0時(shí) P1.0 = 0 正弦波  = 1 鋸齒波　
P1.1 = 1時(shí) P1.0 = 0 方波    = 1 三角波　*/

#include <reg51.h>
#include <ABSACC.H>
#define daport XBYTE[0x8000]
#define adport XBYTE[0x9000]
unsigned char i,j,k,m;
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};
unsigned char code zxb[]={0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,0xfe,0xf6,0xee,0x3e,0x9c,0x7a,0x9e,0x8e};

void main(void)
{
     updown=0;
     SCON=0;
     for (i=0;i<20;i++);
     i=128; j=0;
     adport=0;
     while(1)
     {
       if (P1_1==1)
       {
          if (P1_0==0) //方波
          {
             if (j<=30) i=255;
             else i=128;
             if (j==60) j=0;
          }
          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=sinn[j];
             if (j==63) j=0;
          }
          else //鋸齒波
          {
             if (i==255) i=128;
             else i++;
          }
       }
       daport=i;
       m=adport;
       adport=0;
       for (k=0;k<(1+m/16);k++);
       SBUF=zxb[m/16];
       j++;
     }
}