A first try to write a block device wrapper for the BSP_DISCO_F746NG. I can read and write blocks, but I haven't gotten it to work with FATFileSystem yet.

I'm trying to get Block Device to work with the DISCO_F746NG boards built in SD-card-reader using the BSP_DISCO_F746NG library.

I used the HeapBlockDevice as template, and I have gotten read and program to work when I just try to read or program one block and read it back, but I haven't gotten FATFileSystem to work with this class yet. I'm kind of stuck here right now, so any help would be very much appreciated!

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