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MCU-PLUS-SDK-AM243X: FreeRTOS FAT file system

Chaehee Won
Prodigy 40 points
Part Number: MCU-PLUS-SDK-AM243X

Hello,

I am using mcu_plus_sdk_am243x_08_03_00_18 SDK.

I found source code in the source/fs/freertos_fat directory. It actually does not support FreeRTOS and current code supports nortos. 

I found a problem in the configNUM_THREAD_LOCAL_STORAGE_POINTERS and ffconfigCWD_THREAD_LOCAL_INDEX values.

The configNUM_THREAD_LOCAL_STORAGE_POINTERS is defined in the source\fs\freertos_fat\portable\nortos\FreeRTOS.h file and the defined value is 3.

The ffconfigCWD_THREAD_LOCAL_INDEX  is defined in the source\fs\freertos_fat\config\FreeRTOSFATConfig.h file and the defined value is 4.

The problem is in the source\fs\freertos_fat\FreeRTOS-FAT\include\ff_stdio.h file and it checks these values as below in line 154:

#if ( ( configNUM_THREAD_LOCAL_STORAGE_POINTERS - ffconfigCWD_THREAD_LOCAL_INDEX ) < 3 )
#error Please define space for 3 entries
#endif

The problem is compiler doesn't generate compile errors for this. I think it should be fixed.

  • 0
    TI__Mastermind 26025 points

    Hi Chahee,

    it seems like the ffconfigCWD_THREAD_LOCAL_INDEX is 4U which converts the entire calculation to unsigned and the value -1 is 0xFFFFFFFF which is greater than 3 (in unsigned). So compiler does not give an error.

    I think that this should be fixed in MCU+ SDK as well. Thanks for pointing it out. I will raise a bug for the same.

    Thanks and Regards,
    Aakash Kedia