51单片机控制PCF8591输出4种波形周期可调程序分享

2018-7-19 09:10:00 6548 51单片机 PCF8591

#include
#define uchar unsigned char
#define uint unsigned int
***it  SCL=P2^6;
***it  SDA=P2^7;
***it  key1=P3^6;
***it  key2=P3^7;
uint n=0;
uchar code  Sinwave[]={ //正弦波波表
127, 152, 176, 198, 217, 233, 245, 252,
255, 252, 245, 233, 217, 198,176, 152,
127, 102, 78,  56,  37,  21,  9, 2,
0, 2, 9,  21,  37,  56,  78, 102
};
uchar code Triwave[] = { //三角波波表
0,  16,  32,  48,  64,  80,  96, 112,
128, 144, 160, 176, 192, 208,224, 240,
255, 240, 224, 208, 192, 176, 160, 144,
128, 112,  96,  80,  64,  48,  32,  16
};
uchar code Sawwave[] = { //锯齿波表
0, 8, 16, 24, 32, 40,  48,  56,
64,72,80,  88,  96, 104, 112,120,
128, 136, 144, 152, 160, 168, 176,184,
192, 200, 208, 216, 224,232, 240, 248,
};
uchar code Squwave[]={ //方波波表
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255
};
uint f=30;
void delay()
{ ; ; ;}

void  delay10()
{ uint i,j;
for(i=0;i<10;i++)
   for(j=0;j<250;j++);
}
void  delay11()
{ uint i,j;
for(i=0;i    for(j=0;j<250;j++);
}
void init()
{  SCL=1;
delay();
SDA=1;
delay();
}

void start()
{ init();
      SDA=0;
      delay();
}
void write(uchar date)
{       uchar i,temp;
   temp=date;
      for(i=0;i<8;i++)
         { temp=temp<<1;
         SCL=0;
         delay();
         SDA=CY;
         delay();
         SCL=1;
         delay();
         }
      SCL=0;
      delay();
      SDA=1;
      delay();
}

void respons()
{       uchar i;
   SCL=1;
      delay();
      while((SDA==1)&&(i<250))
         i++;
      SCL=0;
      delay();
}

void stop()
{
      SDA=0;
      delay();
      SCL=1;
      delay();
      SDA=1;
      delay();
}
void writewave(uchar xc)
{
   init();
   start();
            write(0x90);
         respons();
         write(0x40);
         respons();
         write(xc);
         respons();
         stop();
}
void keyscan()
{ if(key1==0)
{
         delay10();
      if(key1==0)
      { f+=10;
         while(!key1);
      }
}
if(key2==0)
{
         delay10();
      if(key2==0)
      { f-=10;
      if(f<=20) f=20;
         while(!key2);
      }
}
}
void  main()
{
while(1)
{  keyscan();
for(n=0;n<32;n++)
      { writewave(Sinwave[n]);
   delay11();       }
   for(n=0;n<32;n++)
   { writewave(Triwave[n]);
      delay11();  }
      for(n=0;n<32;n++)
   { writewave(Sawwave[n]);
      delay11();}
      for(n=0;n<32;n++)
{ writewave(Squwave[n]);
   delay11(); }

   }
}