key.c

433.92m无线模块的接收到有效数据后

///////////////////////////////////////////////
#include "stc51.h"
#include "key.h"
///////////////////////////////////////////////
unsigned char readkeyvale(void)
{ unsigned char data i;
  ken_bus=0xf0;
  delay(10);
  k=ken_bus;
  if(k!=0xf0){ken_bus=0xf0;delay(30);k=ken_bus; 
              if(k!=0xf0){ken_bus=0xfe;
                          i2=0;delay(2);
                           for(i=1;i<5;i++){if((ken_bus&0xf0)==0xf0){if(i==1){ ken_bus=0xfd;delay(2);}
                                                                     else if(i==2){ ken_bus=0xfb;delay(2);}
                                                                     else if(i==3){ ken_bus=0xf7;delay(2);}
                                                                     else          {ken=0x00;break;}      }
                                             else {i2=i;ken=k+i2;break;}
                                            }
                          }
               else    {ken=0x00;}
              } 
  else    {ken=0x00;}
  return(ken);
}