23. Set Baud Rate Field in Control Register

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

#define BAUD_WIDTH 4
#define BAUD_START_BIT 8
#define BAUD_MASK (1 << BAUD_WIDTH) - 1

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    // Your code here

    // Clear bits 8-11
    uint32_t clear_mask = BAUD_MASK << BAUD_START_BIT;
    reg &= ~clear_mask;

    // Mask off MSB 4 bits in BAUD since its only 4-bits in a byte then set bits 8-11
    reg |= (baud & BAUD_MASK) << BAUD_START_BIT;

    return reg;
}

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