topic Dual channel Rpmsg in MCUXpresso SDK

Dual channel Rpmsg

biafra — Thu, 22 Dec 2022 13:56:27 GMT

Hi everyone,

I'm working on a project using a custom board based on imx8m mini. I have to desing the communication between A53 cores and M4 core using rpmsg.
I already saw the rpmsg ping pong example and it's working fine on my board.

To avoid polling mechanism on both sides, I'd want to have the A53 cores waiting for a message from the M4 core and at the same time the M4 core waiting for a message from the A53 cores on a different channel.
How can this be achived?
Do I have to duplicate the instructions between rpmsg_lite_remote_init() and rpmsg_ns_announce() in the main_remote.c source file of the rpmsg ping pong example?
Or is there a better solution?

Many thanks
Biafra

Re: Dual channel Rpmsg

Sanket_Parekh — Wed, 28 Dec 2022 13:59:55 GMT

Hi @biafra ,

I hope you are doing well.

you can create multiple channels in rpmsg lite.

you can follow the below suggestions to create multiple channels in rpmsg-lite:

- need separate vdev rings allocations(VDEVn_VRING_BASE) in board.h and RL_PLATFORM_IMX8MN_M7_USER_LINK_ID at /middleware/multicore/rpmsg_lite/lib/include/platform/imx8mn_m7/rpmsg_platform.h

- need a separate definition for LOCAL_EPT_ADDR, RPMSG_LITE_SHMEM_BASE, RPMSG_LITE_LINK_ID.

- have to make multiple calls to rpmsg_lite_remote_init(),rpmsg_lite_wait_for_link_up(),rpmsg_queue_create(),rpmsg_lite_create_ept(),rpmsg_ns_announce().

Thanks & Regards

Sanket Parekh