typedef struct {
    char
            Addr:   4,
            TSMde:  1,
            ACC:    2,
            TSD:    1,
            RVol:   4,
            GB:     2,
            HDD:    1,
            Mic:    1;

} CS6422Reg_0;

typedef struct {
    char
            Addr:   4,
            AuNECD: 1,
            NCC:    2,
            RSD:    1,
            TVol:   4,
            Taps:   2,
            THDet:  2;

} CS6422Reg_1;

////*****
////*****
////*****

typedef struct {
    CS6422Reg_5 CS6422R5;
    CS6422Reg_4 CS6422R4;
    CS6422Reg_3 CS6422R3;
    CS6422Reg_2 CS6422R2;
    CS6422Reg_1 CS6422R1;
    CS6422Reg_0 CS6422R0;

} CS6422_Reg;


void foo (CS6422_Reg * reg, char num) {
    data = (uint16_t) (reg-> CS6422R0);  //aggregate value used where an integer was expected

/*
Нужно получить регистр номер num в виде 16 бит,
где я натупил?
*/
}