Macro-Based Register Config Helper

Code

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

#define ENB_FIELD(r,b)     (r |= (b & 0x01) << 0)
#define MODE_FIELD(r,b)    (r |= (b & 0x03) << 1) // dich len 1 de lay bit 1-2
#define SPEED_FIELD(r,b)   (r |= (b & 0x07) << 3) // dich trai len 3 de lay bit 3-5

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