Set Multiple Bits in 8-bit Register

Question

Problem: Set Multiple Bits in 8-bit Register. Solve this hands-on electronics task on EWskills.

Accepted Answer

#include 
#include 

uint8_t set_range(uint8_t reg, uint8_t start, uint8_t end) {
    uint8_t mask = ((1 << (end - start + 1)) - 1) << start; 
    return reg | mask;
}

int main() {
    uint8_t reg, start, end;
    scanf("%hhu %hhu %hhu", ®, &start, &end);
    printf("%u", set_range(reg, start, end));
    return 0;
}

Generate a binary mask for the range using left-shifts, then OR it with the original value.

18. Set Multiple Bits in 8-bit Register