Memset Algorithm Handle to zero

Matt Clarkson

Hello,

We have an extended handle object for our codec engine:

typedef struct OUR_ALGORITHM_Obj { IALG_Obj alg; /* MUST be first field of all XDAS algs */ IDMA3_Handle dmaHandles[ MAX_DMA_HANDLES ]; void *memSegments[ MEM_NUM_SEGMENTS ]; int iDummy; int iDummy2; | | int iDummyn; } OUR_ALGORITHM_Obj;

If we do the following in OUR_ALGORITHM_initObj():

OUR_ALGORITHM_Obj ourAlgorithmObj;
memset(&ourAlgorithmObj, 0, sizeof(OUR_ALGORITHM_Obj));

The codec crashes on the DM6446.

I figure something in the structure is filled in before OUR_ALGORITHM_initObj(), either the IALG_Obj at the start or the IDMA3_Handle array by OUR_ALGORITHM_dmaInit().

Could anyone explain this?

Thanks,

Matt

over 14 years ago

0 Chris Ring over 14 years ago

TI__Genius 17205 points

Can you clarify in which of the IALG_Fxns are you clearing this struct? The docs for each of the IALG_Fxns is here - maybe the docs can shed some light on the intended behavior of each fxn?

http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/xdais/latest/docs/html/struct_i_a_l_g___fxns.html

If IALG_Fxns->algInit(), your object is pre-initialized and passed to you as the first arg. You shouldn't be clearing it, there's important info in it, like the location of your memory(!).

Chris

0 Matt Clarkson over 14 years ago in reply to Chris Ring

Intellectual 920 points

Thanks Chris.

Yeah it is in the IALG_Fxns->algInit()

The IALG_Obj we have in our custom extend ALGORITHM_Obj contains the pointer to the IALG_Fxns, so we will need them.

So if I store the passed in IALG_Obj, memset our extend ALGORITHM_Obj, then memcpy the IAG_Obj back in, it'll be ok?

Matt

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Memset Algorithm Handle to zero