Saving logs to TTL to CH376S to USB flash drive

Hi. I want to add USB host CH376S to Zyxel GS1900-8 for saving logs on external USB flash. Someone tryed to do it? Here will need a script for CH376S that can create files and folders and send data packets.

Or is there an easier way to make a USB host via TTL?

UP! Someone?
There is Openlog Serial Data Logger on Atmega328