PROCESSOR-SDK-AM64X: Reception of RP messages by interrupt

Dekel Guterman

Intellectual 330 points

Part Number: PROCESSOR-SDK-AM64X

Hi,

I’m working on RP messages using SDK 08_02_00_31.

The traffic is between R5 and A53.

In your example ipc_rpmsg_echo_linux that I based on, there is messages reception by polling from task.

For our product I should receive the RP messages from interrupt.

Please provide a code example like ipc_rpmsg_echo_linux but with reception of RP messages from interrupt.

Thanks,

Dekel

over 2 years ago

0 Nick Saulnier over 2 years ago

TI__Guru** 100740 points

Hello Dekel,

To confirm, are you looking for an example of the Linux userspace application getting interrupted by RPMsg, or the MCU+ side R5F application getting interrupted by RPMsg?

Regards,

Nick

0 Dekel Guterman over 2 years ago in reply to Nick Saulnier

Intellectual 330 points

Hi Nick,

I'm looking for an example of getting interrupted in the R5 application.

Thanks,

Dekel

0 Nick Saulnier over 2 years ago in reply to Dekel Guterman

TI__Guru** 100740 points

[deleted]

0 Nick Saulnier over 2 years ago in reply to Nick Saulnier

TI__Guru** 100740 points

[deleted]

0 Anshu Choudhary over 2 years ago in reply to Nick Saulnier

TI__Genius 12330 points

Dekel,

please look at the FreeRTOS SMP Task Switch Example

This example shows usage of direct FreeRTOS APIs, i.e not via the DPL APIs. It shows usage of task APIs, task notification APIs, semaphore and delay APIs. It also shows how to signal to FreeRTOS task from ISRs.

The example does the below

Creates two semaphores
Creates two tasks, ping and pong
Run tasks with core affinity
Ping and pong tasks signal each other using semaphores and task notifications
A HW ISR is also created and ping task is signaled from the ISR
Task delay API usage is shown

https://software-dl.ti.com/mcu-plus-sdk/esd/AM64X/08_05_00_24/exports/docs/api_guide_am64x/EXAMPLES_KERNEL_FREERTOS_SMP_TASK_SWITCH.html#autotoc_md1350

Please let me know if this helps

Regards

Anshu

0 Dekel Guterman over 2 years ago in reply to Nick Saulnier

Intellectual 330 points

Sure Nick, no problem.

0 Dekel Guterman over 2 years ago in reply to Anshu Choudhary

Intellectual 330 points

Hi Anshu,

This is not what I'm asking...

We don't use FreeRtos in our product.

I need a code example for reception of RP messages in R5 side by interrupt.

Thanks,

Dekel

0 Nick Saulnier over 2 years ago in reply to Dekel Guterman

TI__Guru** 100740 points

Hello Dekel,

TI supports MCU+ SDK for developing software on R5F. MCU+ SDK is either FreeRTOS, or bare metal. Can you please confirm what software you are developing on the R5F, if you are not using FreeRTOS?

Regards,

Nick

0 Nick Saulnier over 2 years ago in reply to Nick Saulnier

TI__Guru** 100740 points

also, see the companion thread here: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1194822/am6442-booting-issue

0 Ashwin Raj over 2 years ago in reply to Nick Saulnier

TI__Intellectual 2425 points

Hi Dekel,

IPC RPMsg examples currently use RPMessage_recv() which is a blocking mode API. To use callback mode, you can register callback during Endpoint registration as shown below. "gAckDoneSem" is the semaphore which is passed as argument to the callback, and it gets posted within the callback to unblock the application.

/*******************************************************************************************************************************************************************************/

RPMessage_CreateParams createParams;

RPMessage_CreateParams_init(&createParams);

createParams.localEndPt = 12;

createParams.recvCallback = test_rpmsgAckHandler;

createParams.recvCallbackArgs = &gAckDoneSem;

status = RPMessage_construct(&gAckMsgObject, &createParams);

DebugP_assert(status==SystemP_SUCCESS);

/*******************************************************************************************************************************************************************************/

test_rpmsgAckHandler() is the callback registered for the endpoint, which gets invoked whenever a message is received on that endpoint. The callback definition is shown below.

/*******************************************************************************************************************************************************************************/

void test_rpmsgAckHandler(RPMessage_Object *obj, void *arg, void *data, uint16_t dataLen, uint16_t remoteCoreId, uint16_t remoteEndPt)

{

SemaphoreP_Object *pDoneSem = (SemaphoreP_Object *)arg;

SemaphoreP_post(pDoneSem);

}

/*******************************************************************************************************************************************************************************/

Regards,

Ashwin

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PROCESSOR-SDK-AM64X: Reception of RP messages by interrupt