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  1. #include <REGX52.H>
  2.  
  3. #define TT 8000
  4.  
  5. sbit STRm = 0x84;
  6. sbit ACKm = 0x85;
  7.  
  8. sbit STRs = 0x86;
  9. sbit ACKs = 0x87;
  10.  
  11. bit b1 = 1;
  12. bit b2 = 1;
  13.  
  14. int dt = TT/1000;
  15. int tt = TT/100;
  16. unsigned char LiczB2 = 0x00;
  17.  
  18.  
  19. void LiczInt0(void) interrupt 0 {
  20.     EX0 = 0;
  21.     LiczB2++;
  22.     if(LiczB2 == 255){
  23.         LiczB2 = 0;
  24.     }
  25.     EX0 =  1;
  26.     b2 = 0;
  27.     ACKm = 0;
  28. }
  29.  
  30. void wait(int i){
  31.     unsigned int k,l,m;
  32.    
  33.     for(l=0;l<i;l++){
  34.         k=500;
  35.         m=1000;
  36.         k=m*k;
  37.     }
  38. }
  39.  
  40.  
  41. void init(){
  42.     LiczB2 = 0;
  43.     if(P0_0 == 0){
  44.     STRm = 1;
  45.     ACKm = 0;
  46.     }
  47.     if(P0_0 == 1){
  48.     STRs = 1;
  49.     ACKs = 0;
  50.     }
  51.     IT0 = 1;
  52.     EX0 = 1;
  53.     EA = 1;
  54. }
  55.  
  56. void main(){
  57.     init();
  58.     wait(tt);
  59.     while(P0_0 == 0){
  60.         while(b2){
  61.             wait(dt);
  62.         }
  63.         P1 = LiczB2;
  64.         b2 = 1;
  65.         while(ACKm == 0){
  66.         STRm = 0;
  67.         P2 = P1;
  68.         }
  69.        
  70.     }
  71.     while(P0_0 == 1){
  72.         while(STRs == 1){
  73.             wait(dt);
  74.         }
  75.         P1 = P2;
  76.         ACKs = 1;  
  77.         wait(50);
  78.        
  79.     }
  80. }
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