Two computer codes (FORTRAN90) used to (1) generate a set of wavevectors sampling a series of Wilson loops in a crystalline material, in a format suitable as input for the CASTEP computer code; and (2) to analyse the results arising from CASTEP when used on the previously generated wavevectors, in order to calculate Berry phases for each Wilson loop. These actions allow one to identify and Weyl points and to quantify their topological charges.

Instructions for usage are supplied in the README_Code file, and example input files are also provided.