MS1987

@fpistm , time flies. How about the function of USB Host now?

@fpistm Can this PR be merged now?

@corelc , be sure that when using tft28/tft35 to control, cannot use the pc software, Repetier Host eg, to connect the mainboard at the same time.

@Kodbee , sorry for so delay response. I check your files, and just now don't find the reason. But I want to ask : you connect the RAMPS both with...

Also found it on the buster version: ``` # apt-get update Hit:1 http://deb.debian.org/debian buster InRelease Hit:2 http://deb.debian.org/debian buster-updates InRelease Get:3 http://security.debian.org buster/updates InRelease [34.8 kB] Get:4 http://deb.debian.org/debian buster-backports InRelease [51.4...