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inverter byte

Concepcion Marco Valero

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
  • 0 

    #include <reg52.h>
unsigned char mr;

unsigned char invertir_byte (mr) {
bit tempb;
unsigned char count,temp;
for(count=8;count;count--)
{
   tempb=mr&0x01;
   mr>>=1;
   temp<<=1;
   temp=temp|tempb;
}
return (temp);

}

void main()
{
while(1)
  {
  P1=invertir_byte(0x33);
  }
}

Program Size: data=12.1 xdata=0 code=64
It's spend 175 clock cycles

Reply
  • 0 

    #include <reg52.h>
unsigned char mr;

unsigned char invertir_byte (mr) {
bit tempb;
unsigned char count,temp;
for(count=8;count;count--)
{
   tempb=mr&0x01;
   mr>>=1;
   temp<<=1;
   temp=temp|tempb;
}
return (temp);

}

void main()
{
while(1)
  {
  P1=invertir_byte(0x33);
  }
}

Program Size: data=12.1 xdata=0 code=64
It's spend 175 clock cycles

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