Set Baud Rate Field in Control Register

Code

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

uint32_t clear_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    // Create mask with 1s in positions to clear, then invert and AND
    uint32_t mask = ((1U << len) - 1) << pos;
    return reg & ~mask;
}

uint32_t replace_field(uint32_t reg, uint32_t val, uint8_t pos, uint8_t len) {
    // Step 1: Clear the target field using a mask
    uint32_t mask = ((1U << len) - 1) << pos;
    reg &= ~mask;

    // Step 2: Shift the new value and OR it into position
    reg |= (val & ((1U << len) - 1)) << pos;

    return reg;
}

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    reg = clear_bits(reg,8,4);
    reg = replace_field(reg,baud,8,4);
    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