23. Set Baud Rate Field in Control Register

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

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {

    uint32_t mask = 0xF00;   // bits 8-11

    reg = (reg & ~mask) | ((baud & 0xF) << 8);

    return reg;
}

int main() {

    uint32_t reg;
    uint8_t baud;

    scanf("%u %hhu", &reg, &baud);

    printf("%u\n", set_baud_rate(reg, baud));

    return 0;
}