TDA4VM: IPC communication

Marko Milosevic

Part Number: TDA4VM

Hello TI

We have two questions about IPC communication on TDA4 SOC.

1. Is there any IPC example when we need to transfer data larger than 512 bytes?
Our understanding is:
First, we allocate a buffer in memory and put data into a buffer which are a length larger than 512 bytes.
With function RPMessage_send() we send the address of this memory location to another processor.
From another processor, we just read from this memory region.
Is this correct? Do you have a better suggestion?

2. Whether there is a mechanism with IPC to send a multicast message to several other processors?
Or we need to send the same message several times to different processors?

Best Regards,
Marko.

over 4 years ago

+1 Sunita Nadampalli over 4 years ago

TI__Expert 5970 points

Hi Marko,

1. Yes, your understanding about sending about sending larger payload as a pointer in rpmsg packet is correct.

2. No. There is no multicast message support. You need to send the message separately for each processor.

Thanks & Regards,

Sunita.

0 Marko Milosevic over 4 years ago in reply to Sunita Nadampalli

Intellectual 412 points

Hi Sunita,

Thank you for the response.

Best regards,

Marko.

0 fu liu1 over 4 years ago in reply to Sunita Nadampalli

Prodigy 160 points

1. Yes, your understanding about sending about sending larger payload as a pointer in rpmsg packet is correct.

For this, can you give us a example for this ?

thanks,

0 Sunita Nadampalli over 4 years ago in reply to fu liu1

TI__Expert 5970 points

Hi,

Please refer to the below IPC example in Vision_apps:

vx_app_linux_arm_ipc.out

source location: vision_apps/apps/basic_demos/app_ipc

Thanks & Regards,

Sunita.

0 Marko Milosevic over 4 years ago in reply to Sunita Nadampalli

Intellectual 412 points

Hi Sunita,

I have two more questions:

It is possible that two core communicate with ethernet?

Does the Integrated Ethernet switch called Common Platform Switch (CPSW) CPSW2G and CPSW9G exists on TDA4 J721e SoC or it is a separate component on the evaluation board?

Best regards.

Marko.

0 Sunita Nadampalli over 4 years ago in reply to Marko Milosevic

TI__Expert 5970 points

Hi Marko,

1. Can you elaborate on Ethernet communication between two cores?

2. CPSW2G and CPSW9G are integrated switches and exist on TDA4 J721e SoC.

Thanks & Regards,

Sunita.

0 Marko Milosevic over 4 years ago in reply to Sunita Nadampalli

Intellectual 412 points

Hi Sunita,

I think on Inter-Core communication over Ethernet instead of TI IPC. For example, I want to send some data from MPU1_0 to MCU2_0 within the SoC. On Mpu1_0 we create a server (TCP/IP or UDP - it does not matter) on other cores we create a client app. Is It possible for cores to communicate in this way?

Best regards,

Marko.

+1 Sunita Nadampalli over 4 years ago in reply to Marko Milosevic

TI__Expert 5970 points

Hi Marko,

IPC over ethernet is not supported in the current SDKs. However, this feature is under discussion for future SDKs, timelines are not finalized yet.

Thanks & Regards,

Sunita.

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TDA4VM: IPC communication