Macro-Based Register Config Helper

Code

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

// bit pos
#define ENABLE_BIT 0
#define MODE_BIT 1
#define SPEED_BIT 3

// width
#define ENABLE_MASK 0x1
#define MODE_MASK 0x3
#define SPEED_MASK 0x7

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg = 0;

    reg |= (enable & ENABLE_MASK) << ENABLE_BIT;
    reg |= (mode & MODE_MASK) << MODE_BIT;
    reg |= (speed & SPEED_MASK)<< SPEED_BIT;
    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