最近用74hc165扩展IO口 一直整不对，希望高手指教

#define uchar unsigned char
#define uint unsigned int
sbit sck=P1^5;
sbit inout=P1^7;
sbit sch=P1^6;
uchar num;
uint k;
uchar hc165();
void delay(uint z);
void main()
{
 while(1)
 {
  num=hc165();
  P2=num;
  delay(200); 
 }
}
uchar hc165()
{
 uchar temp,i;
 sch=1;      
 NOP();
 sch=0;
 NOP();
 sch=1;
 NOP();
 temp=0;
 for(i=0;i<8;i++)
 {
  sck=1;
  if(inout==1)temp=temp+1;
  temp=temp<<1;
  sck=0;
  NOP();
 }
 return temp;
}
void delay(uint z)
{
 uint x,y;
 for(x=z;x>0;x--)
 for(y=110;y>0;y--);
}