Macro-Based Register Config Helper

Code

#include <stdio.h>
#include <stdint.h>

// Define macros here

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg;
    reg |= (enable & 0x1 )   << 0;      //bit 1
    reg |= (mode   & 0x3 )     << 1;   //bit 2
    reg |= (speed  & 0x7 )    << 3;   //bit 3
    return reg;
}

int main() {
    uint8_t enable, mode, speed;
    scanf("%hhu %hhu %hhu", &enable, &mode, &speed);

    uint16_t reg = build_register(enable, mode, speed);
    printf("%u", reg);
    return 0;
}

Solving Approach