Decode ADC Result Using Union Bitfields

Code

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

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



typedef struct{
    uint16_t val :12;
    uint16_t chan :4;   
}ADC_field_t;

typedef union{
    ADC_field_t field;
    uint16_t raw;
} ADC_Result;

int main() {
    uint16_t reg;
    scanf("%hx", &reg);

    // Fill union and print channel and adc_value
    ADC_Result res;
    res.raw = reg; 
    printf("Channel: %u\nADC Value: %u\n", res.field.chan, res.field.val);

    return 0;
}

Solving Approach