TMS320F28377D: DMA transfer the ADC result on two CPUs at the same time

Sh.Sasaki

Part Number: TMS320F28377D

Hi experts,

Is it possible to transfer ADC results to CPU1 and CPU2 at the same time?

For example, when the ownership of ADC_A is CPU1 with the following settings, can the conversion completion flag of ADC_A be set to the DMA transfer start trigger of both CPU1 and CPU2?

DevCfgRegs.CPUSEL11.ADC_A = 0;

Best regards,
Sasaki

over 3 years ago

0 Manoj Santha Mohan over 3 years ago

TI__Guru 55700 points

Sasaki,

You can move the ADC results to GSxRAM. Both CPU1 and CPU2 have access to GSxRAM

REgards,

Manoj

0 Sh.Sasaki over 3 years ago in reply to Manoj Santha Mohan

Guru 13625 points

Hi Manoj-san,

Thank you for the information.

I want to know if the device can trigger both CPU1 DMA and CPU2 DMA at the same time when the conversion of ADC_A is complete.

Is this possible?

Best regards,
Sasaki

+1 Manoj Santha Mohan over 3 years ago in reply to Sh.Sasaki

TI__Guru 55700 points

Sasaki,

I think it is possible to trigger both CPU1/CPU2 DMA with following method:

- Bring ADC end of conversion on GPIOx using OUTPUTXBAR

- Externally connect GPIOx to GPIOy and GPIOz

- Assign GPIOy to CPU1 and have external interrupt caused by GPIOy to trigger CPU1.DMA

- Assign GPIOz to CPU2 and have external interrupt caused by GPIOz to trigger CPU2.DMA

- Configure CPU1.DMA and CPU2.DMA to trigger on exteral interrupt

I hope you're are aware that ADC assigned to CPU1 cannot be read from CPU2.

Regards,

Manoj

0 Sh.Sasaki over 3 years ago in reply to Manoj Santha Mohan

Guru 13625 points

Hi Manoj-san,

Thank you for the information.

I suggest it to the customer.

Manoj Santha Mohan said:
I hope you're are aware that ADC assigned to CPU1 cannot be read from CPU2.

The ADC assigned to CPU1 is likely to be readable by CPU2.

Best regards,
Sasaki

0 Manoj Santha Mohan over 3 years ago in reply to Sh.Sasaki

TI__Guru 55700 points

Great!

I'm closing this thread for now. Feel free to re-open this thread if required.

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TMS320F28377D: DMA transfer the ADC result on two CPUs at the same time