TDA3: EDMA Autoincrement transfer with in EVE

Hi Sritam,

I have forwarded your question to EVE experts.

Regards,
Yordan

Hi Sritam,

   Autoincrement utility requires that number of blocks in horizontal and vertical direction are same for both input and output transfer. To achieve your data flow you can use two instances of auto increment utility one which is configured for input blocks and the other which is configured for output blocks. Let me know if this will work for you.

Regards,

Anshu

Hello Anshu,

I have configured 2 different instances of autoincrement utility. But the challenge i am facing is in configuring the transferProp parameters for out transfer.

For an example if we consider an input image of 1280 x 768 and block size of 32 x 32, then the input transfer parameters are listed below

initParamIn.numInTransfers = 1;
initParamIn.numOutTransfers = 0;
initParamIn.transferType = EDMA_UTILS_TRANSFER_IN;

initParamIn.transferProp[0].roiWidth = 1280;
initParamIn.transferProp[0].roiHeight = 768;
initParamIn.transferProp[0].roiOffset = 0;
initParamIn.transferProp[0].blkWidth = 32;
initParamIn.transferProp[0].blkHeight = 32;
initParamIn.transferProp[0].extBlkIncrementX = 32;
initParamIn.transferProp[0].extBlkIncrementY = 32;
initParamIn.transferProp[0].intBlkIncrementX = 0;
initParamIn.transferProp[0].intBlkIncrementY = 0;
initParamIn.transferProp[0].extMemPtrStride = 1280;
initParamIn.transferProp[0].interMemPtrStride = 32;
initParamIn.transferProp[0].extMemPtr = src;
initParamIn.transferProp[0].interMemPtr = srcBlk;
initParamIn.transferProp[0].dmaQueNo = 0;

The output transfer parameters are mentioned below. 

initParamOut.numInTransfers = 0;
initParamOut.numOutTransfers = 1;
initParamOut.transferType = EDMA_UTILS_TRANSFER_OUT;

initParamOut.transferProp[0].roiWidth = 768;
initParamOut.transferProp[0].roiHeight = 1280;
initParamOut.transferProp[0].roiOffset = 0;
initParamOut.transferProp[0].blkWidth = 32;
initParamOut.transferProp[0].blkHeight = 32;
initParamOut.transferProp[0].extBlkIncrementX = 0;
initParamOut.transferProp[0].extBlkIncrementY = -32;   ??/* Please comment */
initParamOut.transferProp[0].intBlkIncrementX = 0;
initParamOut.transferProp[0].intBlkIncrementY = 0;
initParamOut.transferProp[0].extMemPtrStride = 768;
initParamOut.transferProp[0].interMemPtrStride = 32;
initParamOut.transferProp[0].extMemPtr = dst+(1280-32)*768;
initParamOut.transferProp[0].interMemPtr = dstBlk;
initParamOut.transferProp[0].dmaQueNo = 0;

In the output transfer param the extMemPtr is pointing to the 32th line from the last of the image. After the first processed block of size 32 x 32 is written at that location, next processed block  needs to be written 32 lines above to the previous location where it has been written. So the extBlkIncrementY has to be -32. But this variable can expect only unsigned integers.

Please suggest how can we configure the output transfer parameters.

Regards,

Sritam

Hi Sritam,

   Currently we dont support negative values for increment. I am not able to fully understand what you are trying to do. From what I understand is that you want to do auto increment in such a way that first you write the last block row followed by the one above it ( ie starting from bottom of an image and going to the top). I am not sure why you need this. If you can explain your data flow in more detail we could try to suggest best alternative available.

Regards,

Anshu

Hello Anshu,

We are trying to Rotate an image of dimension 1280 x 768 by 90 degree in EVE.
To achieve the same we are using the provided ROTATE kernel in the imgsiglib directory. This helps us to rotate a block of M x N dimension with each being a multiple of 32.
Now after each block has been rotated, we have to place each rotated block in transposed manner to have the entire image rotated by 90 degree.

We also couldn't find any example where rotation is happening on the entire image to get a hang of the DMA transfer parameters.

Please suggest.

Regards,
Sritam