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標(biāo)題: 單片機(jī)數(shù)字電壓表程序及電路原理圖ADC0808+74ls245 [打印本頁(yè)]
作者: 297    時(shí)間: 2020-12-22 13:05
標(biāo)題: 單片機(jī)數(shù)字電壓表程序及電路原理圖ADC0808+74ls245

  1. #include <reg51.h>
  2. #define uint unsigned int
  3. #define uchar unsigned char
  4. sbit st= P1^0;
  5. sbit eoc= P1^1;
  6. sbit oe= P1^2;
  7. unsigned int a;
  8. unsigned char code seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
  9. void delay(unsigned int j)
  10. {  while(j--);}
  11.   void   display()
  12. {   unsigned char i,wk=0x01;  
  13.      unsigned char buf[3];
  14.      buf[0]=seg[a%10];
  15.      buf[1]=seg[a/10%10];
  16.      buf[2]=seg[a/100];           
  17. for (i=0;i<3;i++)
  18. { P3=wk;
  19. P2=buf[i];
  20. delay(100);
  21. wk=wk<<1;
  22. P2=0xff;
  23. P3=0x04;
  24. P2=0x7f;
  25. delay(100);
  26.         P2=0xff;}
  27. }
  28. void main()
  29. {P1=0x8f;
  30. while(1)
  31.     {st=0;
  32.      st=1;  
  33.      delay(1);
  34.      st=0;
  35. while(eoc==0);  
  36.     oe=1;
  37.    P0=0xff;
  38.    a=P0;
  39.    a=(a*100)/51;
  40.    display();
  41.    oe=0;
  42. }
  43. }
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