I tried the following code with the MPE ARM VFX Forth Stamp Compiler v6.30:

interpreter

\ Parse ccc delimited by " (double-quote) and store the characters as
\ unicode in memory. Return the number of characters stored.
: unicode" ( "ccc<quote>" -- u )
	[char] " parse
	dup if
		tuck ( addr u -- u addr u )
		over + swap ( addr u -- addr+u addr )
		do
			i @ c, 0 c,
		loop
	else
		swap drop
	then
;

: usb-string-descriptor" ( "ccc<quote>" -- )
	here 0 c, 3 c,
	unicode"
	2 * 2 + swap c!
;

target

usb-string-descriptor" LPCUSB"


But it says

Error 337  USB-STRING-DESCRIPTOR" 337/$151 Memory address not in defined section
File .\USB2.FTH  Line 306    Page 1  Page line 306 
usb-string-descriptor" LPCUSB"

I've tried to add "cdata", but no luck. Any idea what I'm doing wrong?