Franz Pucher / TINF

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Bitmanipulationen Grundlegend

Inhalt

Kopiere das Programm in den mbed-Simulator und ändere die globale Variable shift und kontrolliere die vier blauen Leds.

bit-shift.cpp

#include "mbed.h"
 
DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);
 
uint8_t pos = 0;
uint8_t shift = 3;          // change the value between 0 and 3
 
int main() {
    while (1) {
        pos = (1 << shift); // shift left
        printf("%d\n", pos);
        if(pos == 0b00001000)
            led4 = !led4;
        if(pos == 0b00000100)
            led3 = !led3;
        if(pos == 0b00000010)
            led2 = !led2;
        if(pos == 0b00000001)
            led1 = !led1;
        wait_ms(500);
    }
}

Maskierung Baue die folgende Funktion in ein Programm ein.

<<code function>> uint8_t maskAnd() { uint8_t mask = 0x0f; 00001111b uint8_t value = 0x55; 01010101b return mask & value; } <</code>

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