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How to create Memory dynamically in the DSP ?

rajesh peddi
Prodigy 230 points

Hello Experts,

                     How to create the memory dynamically in the DSP ?

 

 

 

Thank you,

Raju

  • 0
    TI__Guru* 96960 points

    Hi Raju,

    Which version of BIOS are you using?

    Do you want to dynamically create a heap which can be used to alloc/free memory?

    Todd

  • 0 in reply to ToddMullanix
    Prodigy 230 points

     

    Hi ToddMullanix,

    Bios version is 5_41_00_06.  

    Yeah i want to create a heap dynamically.

     

     

    Thank you,

    Raju.

  • 0 in reply to rajesh peddi
    TI__Guru* 96960 points

    Hi Raju,

    The API is MEM_define(). There is a good description of this function in the DSP/BIOS API Reference Guide. Basically it is the following where the segid can be passed into MEM_alloc/MEM_free. Note, you have to provide the memory with the base parameter.

    segid = MEM_define(base, length, attrs);

    Parameters
    Ptr base; /* base address of new segment */
    Uns length; /* length (in MADUs) of new segment */
    MEM_Attrs *attrs; /* segment attributes */

    Return Value
    Int segid; /* ID of new segment */

    Todd

  • 0 in reply to rajesh peddi
    TI__Guru*** 125430 points

    The heap size(s) are specified at build time and then one can allocate memory from the heap(s) at run-time.  This article gives instructions on how to do so:

    http://processors.wiki.ti.com/index.php/Creating_Dynamic_Objects_and_Threads_in_BIOS

     

  • 0 in reply to Brad Griffis
    Prodigy 230 points

     

    Hello experts, 

    i am using linux os. In linux the code composer studio is not installed. how to allocate the heap memory can you explain me.

     

     

    Thank you,

    Raju

  • 0 in reply to rajesh peddi
    TI__Guru* 96960 points

    Raju,

     The memory you give to MEM_define can either be static memory (e.g. global Char array) or memory allocated from another heap.

    For example

    Char bigBuffer[4096];
    main()
     {
        int segid;
        ...

        segid = MEM_define(bigBuffer, 4096, NULL);

    or


    main()
     {
        int segid;
        Char *bigBuffer;
        ...
        bigBuffer = MEM_alloc(0, 4096, 0); // segid 0 is the default heap

        segid = MEM_define(bigBuffer , 4096, NULL);

     

    As Brad noted, you can also create a heap statically via the configuration file.

    You might want to try to build some of the BIOS examples and play with them to get a better feel for DSP/BIOS.

    Todd

     

     

     

  • 0 in reply to ToddMullanix
    Prodigy 10 points

    Hi, 

    I tried the global array approach as follows but could not get it work.

    I use linux (no CCS) and dsp/bios bridge, the DSP source code is in a file containing 3 functions required by DSP/BIOS bridge, i.e., x_y_create(), x_y_delete(), and x_y_excute(). 

    The file looks like:

    #include ...

    #define ...

    Char bigBuffer[4096];

    Int segid;

    x_y_create()

    {    segid = MEM_define(bigBuffer, 4096, NULL); ...}

    ...

    The program can be compiled and run if I comment off the statement of segid = MEM_define(bigBuffer, 4096, NULL), but after including this statement, the program encounters run time error during dsp node creation.

    Could Todd or other experts give any hints? Thanks!

    Jia

  • 0 in reply to yucun jia70278
    TI__Guru* 96960 points

    Hi Jia,

    What is the return from MEM_define? -1 denotes an error.

    Do you have dynamic memory heaps enabled (look in the System->MEM->Properties)?

    Todd