Set Baud Rate Field in Control Register

Code

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

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    // Your code here
    const uint32_t BAUD_MASK = 0xF << 8;    
    reg &= ~BAUD_MASK;                      
    reg |= (baud & 0xF) << 8;              
    return reg;
}

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

Solving Approach

• Make a mask for the baud field → bits [11:8] → BAUD_MASK = 0xF << 8.
• Clear old baud value → reg &= ~BAUD_MASK; (sets bits [11:8] , keeps others unchanged).
• Shift and insert new baud → reg |= (baud & 0xF) << 8;.
• Result → register now has the new baud value in bits [11:8], all other bits are untouched.