Decode ADC Result Using Union Bitfields

Code

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

typedef union {
    struct {
        uint16_t adc_value : 12;
        uint16_t channel   : 4;
    };
    uint16_t adc_reg;
} ADC_Result;

ADC_Result adc_value;

int main(void)
{
    uint16_t reg;

    scanf("%hx", &reg);

    adc_value.adc_reg = reg;

    printf("Channel: %" PRIu16 "\n", adc_value.channel);
    printf("ADC Value: %" PRIu16 "\n", adc_value.adc_value);

    return 0;
}

Solving Approach