Macro-Based Register Config Helper

Code

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

// Define macros here
// Bit positions
#define ENABLE_POS 0
#define MODE_POS   1
#define SPEED_POS  3

// Set field macros
#define SET_ENABLE(x) ((x & 0x1) << ENABLE_POS)
#define SET_MODE(x)   ((x & 0x3) << MODE_POS)
#define SET_SPEED(x)  ((x & 0x7) << SPEED_POS)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
 unsigned short reg = 0;
   reg = reg | SET_ENABLE(enable);
   reg = reg | SET_MODE(mode);
   reg = reg | SET_SPEED(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