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標題: 51單片機控制PCF8591輸出4種波形周期可調 [打印本頁]

作者: 20151107 時間: 2015-11-15 13:01
標題: 51單片機控制PCF8591輸出4種波形周期可調
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit  SCL=P2^6;
sbit  SDA=P2^7;
sbit  key1=P3^6;
sbit  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[] = { //鋸齒波表
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<f;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(); }

}
}

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