Bitmaskierung

[Alex K. (derheld2k1)]

Hallo zusammen,

ich hab grad irgendwie ein Denkproblem.
Wie kann ich folgendes elegant in einer Schleife ausdrücken?

  if(data & 0x80)             //output '1'
    LCD_PORT |= (1<<SER);
  else                        //output '0'
    LCD_PORT &= ~(1<<SER);
  high_pulse_sck();  
    
  if(data & 0x40)             //output '1'
    LCD_PORT |= (1<<SER);
  else                        //output '0'
    LCD_PORT &= ~(1<<SER);  
  high_pulse_sck();
  
  if(data & 0x20)             //output '1'
    LCD_PORT |= (1<<SER);
  else                        //output '0'
    LCD_PORT &= ~(1<<SER);
  high_pulse_sck();  
    
  if(data & 0x10)             //output '1'
    LCD_PORT |= (1<<SER);
  else                        //output '0'
    LCD_PORT &= ~(1<<SER);    
  high_pulse_sck();

Ich schäm mich jetzt schon, danke schonmal für eure Antworten,
Alex

[Tobi (Gast)]

Wenn ich so spontan nix übersehen habe.

int8_t i;

for(i = 3; i >= 0; i--)
{
  if(data & (1<<(i+4)))
    LCD_PORT |= (1<<SER);
  else
    LCD_PORT &= ~(1<<SER);
  high_pulse_sck();  
}

[Stefan E. (sternst)]

for (uint8_t mask = 0x80; mask & 0xf0; mask >>= 1) {
  if(data & mask)             //output '1'
    LCD_PORT |= (1<<SER);
  else                        //output '0'
    LCD_PORT &= ~(1<<SER);
  high_pulse_sck();  
}

[Alex K. (derheld2k1)]

Danke