Forum Post: How to allocate memory on DSP based on codec engine in DM3730

Hi,

I am trying to allocate memory on dsp through Memory_alloc() function. This work is based on codec engine in DM3730, which is modified from the videnc_copy example. I made some changes in the (.tcf) file  as follows:

bios.setMemDataHeapSections (prog, bios.DDRALGHEAP);

bios.MEM.MALLOCSEG  = bios.DDRALGHEAP;

(the default setup is

bios.setMemDataHeapSections (prog, bios.DDR2);

bios.MEM.MALLOCSEG  = bios.DDR2;

)

and also in the .cfg file, change is made  as follows:

DSKT2.ALLOW_EXTERNAL_SCRATCH = true;

(the default setup is false)

And then in the videnc_copy.c file, i coded :

Memory_AllocParams allocParams;
allocParams.type = Memory_CONTIGPOOL;
allocParams.flags = Memory_NONCACHED;
allocParams.align = 128;
allocParams.seg = 0;

tempBuf2 = (XDAS_UInt8 *)Memory_alloc( minSamples, &allocParams);

I can build the files well. But the run result is wrong. FT_trace print the result

shows that the memory request failed.

How can i copy with this problem?

In addition,

I tried to use malloc function after i changed the setup as described above. i found the

function malloc can work well, though the malloc function is  not allowed in XDAS.

thks in advance!

F.H. Sun