OMAP-L138: EDMA configuration in burst transfer (AB synchronized mode)

Mahesh Hegde

Part Number: OMAP-L138

Hello All,

I have configured the EDMA and i am facing some issues in data transferring. I have written the data in incremental fashion in a memory (0x0000, 0x0001, 0x0002, 0x0003, ....................... 0XFFFF).

if acnt = 20000; bcnt = 6; c=2;

read_paramSet2.srcAddr = (unsigned int) (EMIF_CHIP4_BASE + BURST_DATA_ADDR) ;
read_paramSet2.destAddr = (unsigned int)(addr_1_buff);
read_paramSet2.aCnt = (unsigned short)acnt2;
read_paramSet2.bCnt = (unsigned short)bcnt2;
read_paramSet2.cCnt = (unsigned short)ccnt2;
read_paramSet2.srcBIdx = (unsigned int) (EMIF_CHIP4_BASE + BURST_DATA_ADDR + (acnt2/2));
read_paramSet2.destBIdx = (unsigned int)(addr_1_buff+ (acnt2/2));
read_paramSet2.srcCIdx = (unsigned int) (EMIF_CHIP4_BASE + BURST_DATA_ADDR + ((acnt2/2)*bcnt2));
read_paramSet2.destCIdx = (unsigned int)(addr_1_buff+ ((acnt2/2)*bcnt2));

read_paramSet2.opt = 0x00102004

for the above mentioned configuration, i am able to see the data at destination address is from 0x0000 to 0x7FFF.

What could be the issue

over 6 years ago

0 Cvetolin Shulev-XID over 6 years ago

TI__Guru 65405 points

Hi Mahesh,

I've forwarded this to the EDMA experts. Their feedback should be posted here.

Tsvetolin Shulev

0 Mahesh Hegde over 6 years ago in reply to Cvetolin Shulev-XID

Intellectual 400 points

Hello Tsvetolin,

I didn't received any reply. Please reply for my problem.

0 Rahul Prabhu over 6 years ago

TI__Guru** 114410 points

there is lot of information missing in your post. Are you using EDMA LLD driver ? You seem to be transferring data from some EMIF location, what is connect to the EMIF ? NOR memory, FPGA ? shouldn`t all the IDX parameters be short based on param set description. (SRCBIDX, DSTBIDX) denote the number of BYTES to jump, why are you putting address locations in those parameters? you mention acnt, bcnt, ccnt but in code use acnt2, bcnt2, ccnt2, are both the same ?

Are you seeing the correct data from 0x0000 to 0x7FFF? Please refer to the examples in Chapter 18 of the TRM to see how block move and peripheral burst example PARAMs are configured.

Regards,
Rahul

0 Mahesh Hegde over 6 years ago in reply to Rahul Prabhu

Intellectual 400 points

Hello Rahul,

i am using LLD driver. EMIF is connected to the FPGA and I am transferring the data from there. (SRCBIDX, DSTBIDX) i thought indexing is required for this, hence i used along with the address. Are you suggesting to remove those addresses? Only offset bytes are suffecient?

Data is proper from 0x0000 to 0x7FFF. after that data is starting again from 0x0000.

0 Mahesh Hegde over 6 years ago in reply to Mahesh Hegde

Intellectual 400 points

Hello Rahul,

Do you have any doubts? Please reply back.

Thanks and Regards,

Mahesh

Processors

Processors forum

OMAP-L138: EDMA configuration in burst transfer (AB synchronized mode)