c6678 Memory_alloc

Aamir Husain

Other Parts Discussed in Thread: SYSBIOS

Folks,

I have created a few heaps in external DDR3 and internal L2SRAM and I want to specify in my Memory_alloc the name of the heap.

Normally, if you specify NULL as the first parameter in Memory_alloc it uses the default heap. I now want Memory_alloc to not use the default heap and instead use a heap called myHeap say.

return (void *)Memory_alloc(myHeap, uiSize, 0, &errorBlock);

How do I go about ensuring that myHeap is defined in the source code file that contains the Memory_alloc call. I have already specified the myHeap in the .cfg file and it is in my map file. I have also included multicore_example.h. This multicore-example.h file contains the following lines

/* XDC/BIOS includes */
#include <xdc/runtime/IHeap.h>
#include <xdc/runtime/System.h>
#include <xdc/runtime/Memory.h>
#include <xdc/runtime/Error.h>

#include <ti/sysbios/bios.h>
#include <ti/sysbios/hal/Hwi.h>
#include <ti/sysbios/knl/task.h>
#include <ti/sysbios/heaps/HeapBuf.h>
#include <ti/sysbios/heaps/HeapMem.h>
#include <ti/sysbios/knl/Semaphore.h>

#include <xdc/cfg/global.h>

Thanks, Aamir

over 12 years ago

0 Alan DeMars over 12 years ago

TI__Mastermind 30830 points

Aamir,

The inclusion of <xdc/cfg/global.h> in your C file will bring in all the global object definitions from your config file.

To make your statically declared 'myHeap' a globally visible object you have to preface the declaration with 'Program.global'.

For instance:

Program.global.myHeap = HeapMem.create(blah, blah);

Using this syntax, 'myHeap' should be defined in <xdc/cfg/glbal.h>.

Alan

0 Aamir Husain over 12 years ago in reply to Alan DeMars

Expert 2715 points

Alan,

Thanks for your reply. I was able to figure it out just like you said thanks to another thread on this forum earlier this month.

Where is the xdc/cfg/global.h file actually located when you look at the project?

Thanks,

Aamir

0 Aamir Husain over 12 years ago in reply to Alan DeMars

Expert 2715 points

Alan,

Can I also do this for an array i.e. myHeap[0] to myHeap[7] so I can have a heap in external memory and internal memory for each core?

Thanks, Aamir

0 Alan DeMars over 12 years ago in reply to Aamir Husain

TI__Mastermind 30830 points

I don't believe the Program.global mechanism has support for arrays.

Through a series of tricky #defines, the xdc/cfg/global.h file ultimately includes a generated header file in your project's OUTFILE/configPkg/package/cfg directory.

Alan

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c6678 Memory_alloc