23. Set Baud Rate Field in Control Register

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

#define BAUD_RATE_POS 8
#define BAUD_RATE_LEN 4

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {

    // clear baud_rate
    reg &= ~(((1 << BAUD_RATE_LEN) - 1) << BAUD_RATE_POS);

    // set baud_rate
    reg |= (baud & 0x0F) << BAUD_RATE_POS;

    return reg;

}

int main() {
    uint32_t reg;
    uint8_t baud;
    scanf("%u %hhu", &reg, &baud);
    printf("%u", set_baud_rate(reg, baud));
    return 0;
}