#include<absacc.h>
#define DACR  XBYTE[0xfffe]
#define uchar unsigned char
void juchi(uchar sdata,uchar time);
void fangbo(uchar sdata,uchar time);
void sanjiao(uchar sdata,uchar time);
main()
{
   while(1){
   juchi(255,100);
   sanjiao(255,100);
   fangbo(254,80);//數字不可為255，輸出為0
   }

}
void juchi(uchar sdata,uchar time)//鋸齒
{
   uchar i,j;
   for(i=0;i<=sdata;i++)
      for(j=0;j<time;j++)
         DACR=i;
}

void fangbo(uchar sdata,uchar time)//方波
{
   uchar i;
   for(i=0;i<=time/2;i++)
       DACR=sdata;
   for(i=0;i<=time/2;i++)
       DACR=0;
}

void sanjiao(uchar sdata,uchar  time)//三角
{
   uchar i,j;
   for(i=sdata;i>=0;i--)
     for(j=0;j<time/2;j++)
       DACR=i;
   for(;i<=sdata;i++)
     for(j=0;j<time/2;j++)
       DACR=i;
}