On Mon, Aug 26, 2019, at 1:39 PM, Fabien Lepoutre wrote: > Hi all, > I am running code with the FATFS driver to write a stream into an SD card. > The SD card is FAT32 formatted. > Everything goes well for some time but for some reason, after a while (I've > seen the issue come in at file size = 1.5GB, 2GB, 3GB etc...), the file
Do you really mean GB here, or was it a typo? I never tried using big files like this, but don't mind trying myself! > memory location changes (looks like it wraps to the beginning of the SD > card memory) and overwrites the boot block and FAT structure which corrupts > the entire SD card. > I haven't found any similar issues but not sure anybody has tested the file > system to that extent. > Anyone has an idea on where to start to debug that issue? > I'm guessing this bug would be from the fatfs driver and not the mmc/sdcard > driver... am I wrong to think this? Possibly correct, the elm-chan FAT driver used is quite old now, and the maintainer has very good release notes describing fixes, etc; maybe something there can give a hint. Also those sizes are close to the limits that int32/uint32 can store, so it could be overflow, maybe even in the MMC driver... > Thanks, > Fabien >
