Here is a set of matlab and python routines allowing to download ERA-INTERIM data and create daily CROCO frc and blk files (similar to NCEP ones).

--> First the user need to download the ERA-INTERIM data using a python script located in Aforc_ECMWF. To do so, he/she needs to follow the instructions written in Aforc_ECMWF/README_python, i.e. : 
  1- Install an ECMWF KEY
  2- Install client libraries - Python
  3- Complete the parameters in the ERA-Interim_request.py script
  4- Launch the python script (./ERA-Interim_request.py)

   - By default, downloaded data will be stored in Run/DATA/ERAI.
   - By default these data are NetCDF files interpolated on a 0.25x0.25 grid. Resolution can be changed easely in the python script.
   --> See example of ECMWF requests at https://software.ecmwf.int/wiki/display/WEBAPI/Python+ERA-interim+examples

--> Then, the user need to adapt the crocotools_param.m section :
%--------------------------------------------------
%  Options for make_ECMWF and make_ECMWF_daily  
%--------------------------------------------------

--> Finally, executing make_ECMWF_daily under matlab should work fine.