#include<stdio.h>
#in
typedef struct Divide8Bits_t
{
unsigned char firstHalf:4;
unsigned char secondHalf:4;
}Divide8Bits;
char FIL_historyTable = 0 ;
int main()
{
unsigned char wlgroup =1;
Divide8Bits *ptr = (Divide8Bits *)&FIL_historyTable;
if( !(wlgroup&0x1) )
ptr->firstHalf = 5; // example
else
ptr->secondHalf = 10; // example
printf("val first=%d\n",ptr->firstHalf );
printf("val second =%d\n",ptr->secondHalf);
}