Well, more progress, and so far so good!
In understood that your program proposal is actually a stripped off version of your USB_ASM_Service routine. I have been able to use it within my program now, but calling the DoUSBSERVICE routine using the USB interrupt triggered by your interrupt routine.
So far so good, it does enumerate, and more importantly I have all the control options given by the connected state, Tx/Rx ready. The LED always blink regardless of what the USB is doing.
The only thing that seems to break the code is "DEFINE RESET_ORG 2048 ' Start code at $0800", I added this at the very top to be ready for the bootloader implementation (leaving 1 kWords available). Probably a problem of memory bank and interrupt...
Seems to work very well so far... I am not posting the code until it is ok with you.
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