Posted on June 08, 2018 at 15:51I'd like to follow up with an update on my Win 10 issue. As much as I like to complain about Microsoft it turns out that my issue was Not a Win10 issue but rather an issue with the read and write in the storage msd.c file provided in the first post.
While a 64kB RAMdrive 'seemed' to work on Win 7 and not on Win 10, I later found that it was Not working on both platforms with only the appearance of partially working on Win7 because of dumb luck.
Anyway, the memcpy used in the storage read/writes need a little modification.
in the read function I use memcpy(buf, &usbMassStorage[blk_addr
* STORAGE_BLK_SIZ
],blk_len
* STORAGE_BLK_SIZ
);
The write is similarly modified.
I've only tested this with a small (2,975 bytes) file but I'm able to drag and drop/delete a file in a PC RAMdrive.
There are still a lot of limitations to this example, like formatting every time the device is plugged in, and Win formatting eating a lot of space, but with reference to the above example storage.c file and the small changes shown here, the start of a RAMdrive proof of concept can be realized quite quickly.
I hope someone finds this helpful. Thank you John for starting this discussion and thank you ST for leaving it up for so long.
