ARM to DSP Communication Examples OMAPL137

Hoffiz

Other Parts Discussed in Thread: SYSCONFIG, OMAPL138

I have looked through the forums and have not been able to find a guide or breadcrumb to point me in the right direction. I'm already have the sysconfig examples from the rCSL running which allow you to communicate through the shared memory from the ARM to the DSP using ISRs. I'm hoping for some more advance sharing mechanisms like mailbox, messages, queues, or fifos. I think sys/link and/or IPC is what I'm looking for.

Are those two my options if I would like to share information between the arm and the dsp while both are running SYS/BIOS 6? Any easy examples to get me going?

over 10 years ago

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

Hi,
As you know, we don't have much examples for OMAPL137.
But here we have IPC messageQ and ping examples for OMAPL138 again,

downloads.ti.com/.../index_FDS.html

C:\ti\ipc_3_35_01_07\examples\OMAPL138_linux_elf
C:\ti\ipc_3_35_01_07\examples\OMAPL138_linux_elf\ex11_ping

I think you may need linux here,
e2e.ti.com/.../200194
processors.wiki.ti.com/.../DSPLink_Application_on_OMAP-L1x
processors.wiki.ti.com/.../CCS_Project_OMAP-L137_HelloDSP_DSPLINK_example
processors.wiki.ti.com/.../Debugging_the_DSP_side_of_a_DSPLink_application_on_OMAP-L137_using_CCS

Without Linux,
Install OMAPL138 starterware, you can find some IPC examples.

software-dl.ti.com/.../index_FDS.html

C:\ti\OMAPL138_StarterWare_1_10_04_01\examples\lcdkOMAPL138\ipc_polling
C:\ti\OMAPL138_StarterWare_1_10_04_01\examples\lcdkOMAPL138\ipc_interrupt
C:\ti\OMAPL138_StarterWare_1_10_04_01\examples\lcdkOMAPL138\ipc_buffer_io

I hope this helps.

0 Hoffiz over 10 years ago in reply to Titusrathinaraj Stalin

Expert 1670 points

Thanks that will probably be similar to the effort I made to get the NDK examples of the 138 working on the 137. You might remember from my other post that I won't be able to use Linux on the ARM since I, most likely, will have to fit my entire project into the available memory on the 137. I plan to work on this in about 2 weeks. Once I get it working I will reply back with my experience. Hopefully it can help another TI customer.

0 Titusrathinaraj Stalin over 10 years ago in reply to Hoffiz

TI__Guru** 116100 points

Thanks Hoffiz.
Let us know if any issues.

0 Hoffiz over 9 years ago in reply to Titusrathinaraj Stalin

Expert 1670 points

Hi Titus,

I took your advice and try porting a simple example from the Starterware to support the omapl137. I started with the uartecho example. You and Arvind helped me a lot on this thread:

to be honest the effort was quite challenging but I currently have the uart driver of the starter-ware running on both the DSP and the ARM. I though the ARM was going to be simpler, since both the 138 and 137 have the same ARM. I ended up using the UART driver combined with the rCSL interrupt support quite a recipe.

I'm going to attempt the IPC tomorrow but I have some research questions. Once I port the example, how complicated would it be to integrate it with SYS/BIOS? How do I declare shared memory in SYS/BIOS? so far in most example rCSL and the ones I ported from Starteware that information lives in the .cmd file. I don't see where that is in SYS/BIOS.

I can see in the RTSC tab of a RTSC project the downloaded IPC but you mention in a old thread that it only supports devices with multiples DSP not necessarly DSP + ARM?

Thanks in advance.

0 Titusrathinaraj Stalin over 9 years ago in reply to Hoffiz

TI__Guru** 116100 points

Dear Hoffiz,
For SYS/BIOS related projects, either you can configure the memory through *.cmd or app config file (*.cfg) and platform file, there you can mention about the memory.

You would get generic SYS/BIOS examples for OMAPL13/DA830 from CCS TI Explorer page.

processors.wiki.ti.com/.../BIOS_FAQs
processors.wiki.ti.com/.../BIOS_Getting_Started_Guide
processors.wiki.ti.com/.../BIOS_related_to_XDCtools_and_RTSC?

By looking into release notes of later IPC version, OMAPL138 supports IPC with Linux OS but don't have example without Linux.

For OMAPL137, many of the people developed their own code for IPC from scratch for OMAPL137.
e2e.ti.com/.../1188680

0 Hoffiz over 9 years ago in reply to Titusrathinaraj Stalin

Expert 1670 points

Hi TItus,

I think I will approach it that way. I have the rCSL example for ARM and DSP intergration and I will try to port it into SYS/BIOS. Really the only thing I need to do is share some memory so I can write things from the arm to the dsp and vice versa. A queue or notifier may be a nice to have or something I will need to research later....

Now I need a little help, I screw up the default plataform for the evamomapl137. I saw that it created a zip file which I think was a back up but after replacing the content back, I cannot see the evmomapl137 RTSC plataform in the "edit/view" or use it as a defult to create a new one. I'm using sys/bios 6.42.03.35 and the xdc tools that contain the packages is version: "C:\ti\xdctools_3_23_00_32\packages"

The only thing I did was to change one of the section while practicing the User Guide examples, with the intention of coming back and changing it.

Any suggestions:

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ARM to DSP Communication Examples OMAPL137