AM263X-MCAL-SDK: Transfer ADC results to two CPUs using DMA

Flurin Bühler

Part Number: AM263X-MCAL-SDK

I need to have the same ADC results on Core 0 and Core 1 of R5FSS0 at the same time.

To set up the data transfer I set up EDMA on Core 0 to transfer the ADC results first to the TCMB of core 0 and then to core 1. The data transfer works fine like this. And this way, core 1 does not have the EDMA initialized.

Now my question is: is the EDMA transfer completed interrupt routed to both cores so both cores can service it at the same time? If yes, how can this be done? Can this be done with the interrupt x-bar? Or can I just enable the TPCC0 interrupt on both cores?

Thanks,

Flurin

10 months ago

0 Mihira Madhava Bollapragada 10 months ago

TI__Intellectual 2417 points

Hi Flurin,

Yes you'd have to register interrupt in both cores. Otherwise have an IPC notify from core 0 to core 1 on DMA interrupt at Core 0.

Thanks,

Madhava

0 Flurin Bühler 10 months ago in reply to Mihira Madhava Bollapragada

Prodigy 100 points

Is it as simple as registering the TPCC0 interrupt on core 1 in the vim using HwiP_construct(...)? Or is it necessary to add the EDMA peripheral on CPU1?

0 Allison Nguyen 10 months ago in reply to Flurin Bühler

TI__Mastermind 27390 points

Hello,

This expert is currently out of office. Please allow another 1-2 days for their return.

Best Regards,

Allison

0 Mihira Madhava Bollapragada 10 months ago in reply to Allison Nguyen

TI__Intellectual 2417 points

Hi Flurin,

Yes, registering TPCC0 interrupt on Core 1 would be good enough. The EDMA flags for the interrupt will be cleared by the Core 0 's ISR, so make sure that Core 1's ISR does not clear them again.

Side note...

EDMA Driver handles the ISR and call back to the user's functions. this ISR clears the EDMA flags. calling this from the both cores may lead ot missing of an Interrupt on either core.
Since this is an aggregated interrupt from the EDMA to VIM (of each Core) care needs to be taken while handling the ISR for specific channel TC / ITC flag.

Thanks and regards,

Madhava

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AM263X-MCAL-SDK: Transfer ADC results to two CPUs using DMA