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) {
    uint8_t pos = 8;     // field starts at bit 8
    uint8_t len = 4;     // field width is 4 bits

    // Step 1: Build mask for bits 8–11
    uint32_t mask = ((1U << len) - 1) << pos;

    // Step 2: Clear old baud field
    reg &= ~mask;

    // Step 3: Insert new 4-bit baud value
    reg |= ( (baud & ((1U << len) - 1)) << 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;
}

Solving Approach