Please tell me about ff_fclose error

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So the issue is narrowed down to prvGetFromFATBuffers giving error code 0x80000004.
This is happening because FF_GetBuffer fails to allocate an available cache buffer.
FF_GetBuffer() is the only function issuing caching buffers.

So, it might be the case that all available cache buffers are occupied , when the task calls FF_Close

You should check now 2 things to make sure you are providing sufficient cache memory.

  1. The recommended size for cache memory size = 9 X 512 bytes

  2. Look at how many files are open at the same time and how many tasks are accessing the same volumes (RAM-disk, SD-card). It should not get locked-up; task waiting for either tasks.

    There is a time-out when waiting for a free cache buffer: grep for
    FF_GETBUFFER_WAIT_TIME_MS, by default 20 seconds.

You can refer to this issue for more detailed explanation on optimal FreeRTOS + FAT Cache memory.