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TMS570LC4357: BE32 Convertion

Hamdy Elasawy
Prodigy 145 points
Part Number: TMS570LC4357


Greatings,

I'm Using TMS570LC Launch to Communicate with SD Card and storing a .txt file using fat32 

Fat32 Uses Little endian Format, so i'm supposed to convert the Data  every time i receive it from Sd card and whenever i want to send it.

the basic Conversion code some how doesn't work properly, when searching i learned that tms570 uses BE32.



The Question is 
What is the Difference between BE32 and Normal Big Endian(Byte).

is there is any code or reference that helps me Convert from little endian to BE32 and vice Versa.

  • 0
    TI__Guru**** 198996 points

    Hello Hamdy,

    In BE32, the byte 0 and byte 3, byte 1 and byte 2 are swapped.

    Please refer to the table in this link:

    You can use this function to swizzle the data before sending and after receiving:

    uint32 SwizzleData(uint32 word)

    {

    #if ((__little_endian__ == 1) || (__LITTLE_ENDIAN__ == 1))

    return word;

    #else

    return __rev(word);

    #endif

    }

  • 0 in reply to QJ Wang
    Prodigy 145 points

    is This Mean That when Using uint16 , the Byte order is as same as little endian or it's swapped too.

    thank you Wang for Your Quick response .

  • 0 in reply to Hamdy Elasawy
    TI__Guru**** 198996 points

    Hi Hamdy,

    Sorry for late response. If using uint16, the byte order should be swapped too.

    For RM57 little-endian device:

    write uint16 (0x1234) to SRAM: 

                       address  offset:        0x00             0x01           0x02           0x03

                       uint16=0x1234         0x34              0x12

    For TMS570LC43x big-endian device:

    write uint16 (0x1234) to SRAM: 

                       address  offset:        0x00             0x01           0x02           0x03

                       uint16=0x1234         0x12             0x34