Macro-Based Register Config Helper

Code

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

#define enable_bit(x) ((x & 0x01) << 0) // bit 0
#define mode_bit(x) ((x & 0x03) << 1) // bits 1-2
#define speed_bit(x) ((x & 0x07) << 3) // bits 3-5
// Define macros here

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg=0;
    reg |= enable_bit(enable);
    reg |= mode_bit(mode);
    reg |= speed_bit(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