TDA4VM: TDA4 A72 Mailbox receive with interrupts

Jan Hieber

Part Number: TDA4VM

Hello,

I want to send notifications from the C71 DSP to the A72 (Yocto, userspace).

I don't want polling so I need interrupts or the mailbox HW which uses interrupts.

I looked at:ti-processor-sdk-rtos-j721e-evm-07_02_00_06/pdk_jacinto_07_01_05_14/packages/ti/csl/example/mailbox/mailbox_sender_receiver_app/mailbox_receiver.c

But for the TDA4 there is only polling mode implemented. Is there a reason for this? How can I send notifications from DSP to A72 with interrupts?

PS: I do not want to use OpenVX.

Jan Hieber

over 5 years ago

0 Jan Hieber over 5 years ago

Intellectual 420 points

My guess is that there is currently no mechanism in the mailbox kernel driver to call/notify userspace functions right?

My next guess is that I must use RPMSG to have userspace programs notified right?
And I guess RPMSG uses the mailbox under the hood.

0 Sunita Nadampalli over 5 years ago in reply to Jan Hieber

TI__Expert 5970 points

Hi Jan Hieber,

Yes, your understanding is correct, you need to use rpmsg interface for application layer and rpmsg layer internally uses HW Mailbox in interrupt mode for communication across the core. Please let me know if you are looking for any additional details on rpmsg interface.

Thanks & Regards,

Sunita.

0 Jan Hieber over 5 years ago in reply to Sunita Nadampalli

Intellectual 420 points

Thanks Sunita, that helps already!

You do not have by any chance a minimal RPMSG example for Linux? One without OpenVx stuff in it and so...

Thanks

Br Jan

0 Sunita Nadampalli over 5 years ago in reply to Jan Hieber

TI__Expert 5970 points

Hi Jan,

We do have rpmsg based IPC examples. Please refer to the below user guides that talks about IPC testing with Linux.

1. RTOS IPC LLD user guide along with Linux kernel sample validation:

https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/07_02_00_06/exports/docs/pdk_jacinto_07_01_05_14/docs/userguide/jacinto/modules/ipc.html

2. Linux user space library and usage:

https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-jacinto7/07_02_00_07/exports/docs/linux/Foundational_Components_IPCLLD.html

Thanks & Regards,

Sunita.

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TDA4VM: TDA4 A72 Mailbox receive with interrupts