Pointer cannot save Value

The code is relatively simple, that is, passing the stored value in the array to the pointer through the index change of the array and returning it to the function for calling. However, it is normal to extract the data in the array, however, after a pointer is given, the value of the pointer cannot be changed. The value of the pointer is sometimes the value of the previous time. The value of this time is not saved in it, and other values may occur. ,

Check the SP address () and register 8 bits. In this case, the address must have exceeded. This is the case.

Pointer cannot save Value