单片机+DAC0832转换，输出三种波形

ID:858693 · 发表于 2020-12-11 17:10

代码：
#include<reg51.h>
#include<math.h>

#define uchar unsigned char
#define uint unsigned int

sbit p0 = P1^0;
sbit p1 = P1^1;
sbit p2 = P1^2;
uchar a;
uint c;
float b;
bit flag;

void delay(uint x)       //延时
{
      uint i, j;
      for(i = x; i > 0; i--)
            for(j = 110; j > 0; j--);
}

void Rectangular_wave()             //方波
{
//       while(!p0);
      while(p1 == 1 && p2 == 1)
      {
            P2 = 255;
            delay(150);
            P2 = 0;
            delay(150);
      }
}

void delta()       //三角波
{
//       while(!p1);
      while(p0 == 1 && p2 == 1)
      {
            for(a = 1; a <= 128; a++)
            P2 = a;
            for(a = 128; a >= 1; a--)
            P2 = a;
      }
      a = 0;
}

void sinusoical()       //正弦波
{
//       while(!p2);
      flag = 0;
      while(p0 == 1 && p1 == 1)
      {
               for(c = 0; c < 10000 && flag == 0; c++)
            {
                     b = 64 + 63 * sin(2 * 3.1415926 * c * 500 / 40000);
                     P2 = b;
                     if(p0 == 0 || p1 == 0)
                     flag = 1;
            }
      }
}

void scan()
{
      if(p0 == 0)       Rectangular_wave();
      if(p1 == 0)       delta();
      if(p2 == 0) sinusoical();
}

void main()
{
      while(1)
      {
            scan();
      }
}

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