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inverter byte

elegante inversion.


/*------------------------------------------------------------------------------

                                        INVERSION DE BYTE 8 BIT, LSB ->  MSB

------------------------------------------------------------------------------*/
unsigned char mr;

unsigned char invertir_byte (mr) {

  mr = (mr & 0x0F) << 4 | (mr & 0xF0) >> 4;
  mr = (mr & 0x33) << 2 | (mr & 0xCC) >> 2;
  mr = (mr & 0x55) << 1 | (mr & 0xAA) >> 1;

return (mr);

}


Parents
  • #include <reg52.h>
     unsigned char bdata temp;
     sbit D0=temp^0;
     sbit D1=temp^1;
     sbit D2=temp^2;
     sbit D3=temp^3;
     sbit D4=temp^4;
     sbit D5=temp^5;
     sbit D6=temp^6;
     sbit D7=temp^7;
    
    unsigned char invertir_byte (unsigned char mr)
     {
     D7=mr&0x01;
     D6=mr&0x02;
     D5=mr&0x04;
     D4=mr&0x08;
     D3=mr&0x10;
     D2=mr&0x20;
     D1=mr&0x40;
     D0=mr&0x80;
     return (temp);
     }
    
    void main()
    {
    while(1)
      {
      P1=invertir_byte(0x33);
      }
    }
    


    Program Size: data=10.0 xdata=0 code=59
    cost 35 machine cycle.

Reply
  • #include <reg52.h>
     unsigned char bdata temp;
     sbit D0=temp^0;
     sbit D1=temp^1;
     sbit D2=temp^2;
     sbit D3=temp^3;
     sbit D4=temp^4;
     sbit D5=temp^5;
     sbit D6=temp^6;
     sbit D7=temp^7;
    
    unsigned char invertir_byte (unsigned char mr)
     {
     D7=mr&0x01;
     D6=mr&0x02;
     D5=mr&0x04;
     D4=mr&0x08;
     D3=mr&0x10;
     D2=mr&0x20;
     D1=mr&0x40;
     D0=mr&0x80;
     return (temp);
     }
    
    void main()
    {
    while(1)
      {
      P1=invertir_byte(0x33);
      }
    }
    


    Program Size: data=10.0 xdata=0 code=59
    cost 35 machine cycle.

Children