Heap in L2RAM in C6474?

Sven Brehmer63926

Prodigy 50 points

Other Parts Discussed in Thread: SYSBIOS

Can someone explain how to locate a heap in L2RAM using ti.sysbios.heaps.HeapMem and the HeapMem_xxx() functions?

Thanks,

Sven

over 14 years ago

0 Robert Tivy over 14 years ago

TI__Mastermind 18260 points

var heapMem = xdc.useModule('ti.sysbios.heaps.HeapMem');
var heapMemParams = new heapMem.Params();
heapMemParams.sectionName = ".L2RAMHeap"; // can be existing section or new section name
heapMem.create(heapMemParams);
Program.sectMap[".L2RAMHeap"] = "L2RAM"; // place section .L2RAMHeap into L2RAM MEMORY

That should do the trick.

Regards,

- Rob

0 ToddMullanix over 14 years ago in reply to Robert Tivy

TI__Guru* 96960 points

Hi Sven,

If you want to dynamically create the heap, you need to place the the buffer into a section and then pass the buffer to the create (note: you still need the Program.sectMap[".L2RAMHeap"] = "L2RAM"; in your .cfg file as Rob showed above).

/* Place into section*/
#pragma DATA_SECTION(heapBuffer, ".L2RAMHeap")
char heapBuffer[SIZE];

....

HeapMem_Params params;
HeapMem_Handle heap;

HeapMem_Params_init(&params);
params.size = SIZE;
params.buf = heapBuffer;
heap = HeapMem_create(&params, NULL);

Todd

0 Sven Brehmer63926 over 14 years ago in reply to Robert Tivy

Prodigy 50 points

Rob,

Thanks,

Sven

0 Sven Brehmer63926 over 14 years ago in reply to ToddMullanix

Prodigy 50 points

Todd,

Thanks,

Sven

0 Sven Brehmer63926 over 14 years ago in reply to Robert Tivy

Prodigy 50 points

Rob,

Follow on question:

Would the following be the recommended way to place the heap in a specific location in the L2RAM?

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Program.sectMap[".L2RAMHeap"]= {loadAddress: 0x00810000};

Or can it be done with L2RAM + offset?

Thanks,

Sven

0 Robert Tivy over 14 years ago in reply to Sven Brehmer63926

TI__Mastermind 18260 points

Sven,

Your example seems fine, but I don't know your ultimate goal.

Re: your L2RAM + offset question... I suppose you could do:
L2Ram = Program.cpu.memoryMap["L2RAM"];
Program.sectMap[".L2RAMHeap"] = {loadAddress: L2Ram.base + offset};

Regards,

- Rob

0 Sven Brehmer63926 over 14 years ago in reply to Robert Tivy

Prodigy 50 points

Rob,

Thanks. We are using the L2RAM for multiple purposes and this allows us to control precisely what goes where.

Regards,

Sven

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Heap in L2RAM in C6474?