Content originally posted in LPCWare by mubes on Sat Apr 12 04:32:21 MST 2014
Folks,
I'm using the LPC13Uxx USB ROM to implement a composite device, one element of which is a MSC driver.
Unfortunately the MSC is talking 'through' to a SD card which could, on occasion, not be present, or could be removed during operation...it could also be replaced with another one I guess. I also have some on-board memory that it would be nice to export on a separate LUN. The 'default' MSC handler (header in mw_usbd_mscuser.h) is a simple in/out affair that doesn't seem to cope with these scenarios.
Intriguingly, there is the facility to incorporate a custom Ep0 handler and the SCSI definitions too (in MSC_CTRL_T) which I suspect can be used to do what I need without having to hack up an entire stack.
So, the question is; can anyone point me in the right direction for examples or documentation to do such a thing? There's a _lot_ of docs around for the usb stuff, but it all seems a big mass to someone just wading through this...
Thanks in advance for any help anyone can offer.
Regards
DAVE
