Macro-Based Register Config Helper

Code

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


#define ENABLE_POS   0
#define MODE_POS     1
#define SPEED_POS    3

#define ENABLE_MASK  (0x1 << ENABLE_POS)
#define MODE_MASK    (0x3 << MODE_POS)   
#define SPEED_MASK   (0x7 << SPEED_POS)  


#define SET_ENABLE(val)   (((val) & 0x1) << ENABLE_POS)
#define SET_MODE(val)     (((val) & 0x3) << MODE_POS)
#define SET_SPEED(val)    (((val) & 0x7) << SPEED_POS)



uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    return (SET_ENABLE(enable) |
            SET_MODE(mode)     |
            SET_SPEED(speed)); 
}

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