Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENBALE_BIT(reg, value)     reg |= ((value & 0x01) << 0)
#define MODE_FIELD(reg, value)     reg |= ((value & 0x03) << 1)
#define SPEED_FIELD(reg, value)    reg |= ((value & 0x07) << 3)
#define RESERVED_FIELD(reg, value) reg |= (value << 6)

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

    ENBALE_BIT(reg, enable);
    MODE_FIELD(reg, mode);
    SPEED_FIELD(reg, speed);
    RESERVED_FIELD(reg, 0);

    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