Using EDMA3 with BIOS 5.41 (Using Code Composer Studio Version 4.2.3 and C6748 processor)

Debarati Kundu

Other Parts Discussed in Thread: OMAPL138

Hi,

I am planing to develop some codes using EDMA3 (with BIOS 5.41), Code Composer Studio Version 4.2.3 and C6748 (OMAPL138)processor. I want to develop a sine wave generation by storing the sine values for one cycle in a table and then repeatedly transferring the entries of the table by self chained transfer using EDMA3. I want to transfer the output samples by McASP Port and view the result in an oscilloscope. From where I can find an example in which data has been sent out to the peripherals using EDMA? I have not programmed with EDMA before. Can you please tell me where I can start? I have downloaded the EDMA3 LLD (from http://software dl.ti.com/dsps/dsps_registered_sw/sdo_sb/targetcontent/psp/edma3_lld/edma3_lld_01_07/index.html). But I am having some difficulty following the codes and find that the examples do not have any program that does real time data transfer between the peripherals.

Thanks,

Debarati.

over 14 years ago

0 Prasad Konnur over 14 years ago

TI__Expert 6065 points

Debarati,

You can look into the EDMA examples to know about programming with EDMA, Also the documents are available in docs folder for APIs and the Driver usage.

In the examples given the transfers are between two memory locations. For EDMA you need to configure the source and destination addresses properly. For ex. transfer from some peripheral, you need to set its memory mapped register address in the source address And set the opt field of PARAMs in not incremental mode you can find details in device spec of EDMA.

Let me know if you are facing any further issues

0 Brad Griffis over 14 years ago

TI__Guru*** 125430 points

If you're looking for low level code you might find this helpful:

http://processors.wiki.ti.com/index.php/QuickStartOMAPL1x_rCSL

0 Matan Aloni over 12 years ago in reply to Brad Griffis

Prodigy 175 points

Brad Griffis said:

If you're looking for low level code you might find this helpful:

http://processors.wiki.ti.com/index.php/QuickStartOMAPL1x_rCSL

Hi Brad,

I tried using the quick start examples you suggested. I managed to import, build and run the example projects (edma manual trigger and edma ping-pong) but when I run the output files the program gets stuck when trying to copy using the EDMA. The manual trigger program is stuck on "Begin..." and the ping-pong program is stuck on "Initiating transfer...".

I am using OMAP138 and CCS5.

Can you assist?

Thanks,

Matan

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Using EDMA3 with BIOS 5.41 (Using Code Composer Studio Version 4.2.3 and C6748 processor)