//asume I have Array[], initial 32 bytes value, and Result[] 16x16 matrix

for(i=0;i<32;i++){
char byte=Array[i]
for(x=0;x<8;x++){
if(byte&1){
    Result[i*8+x]=1;
}else{
    Result[i*8+x]=0;
}
byte=byte>>1;
}
}