Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE(val,enable) val |= (enable & 0x1U);
#define SET_MODE(val,mode) val |= ((mode&0x3U) << 1U);
#define SET_SPEED(val,speed) val |= ((speed&0x7U) << 3U);


uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0;
    SET_ENABLE(reg,enable)
    SET_MODE(reg,mode)
    SET_SPEED(reg,speed)
    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