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I have an eMMC connected to an STM32H7 via the SDMMC1 interface and am using the File System component provided by Keil.
The eMMC registers as M0:. In the debugger, the File System window shows everything looks good.
finit() and fmount() both return fsOK.
However, after these, when I use fopen("Test.txt", "w") the result is always NULL.
I do not have access to the source code and there are no events generated when this call fails.
How can I debug this?