F28069: SPI reception using DMA

Vishwanatha Manevarthe

Hello,
I am using SPI to interface external Flash and read huge chunk of data over SPI.
I was wondering whether I can use DMA to copy data from SPI FIFO upon RX interrupts.
I checked the technical reference manual and saw that there is no explicit support for SPI in DMA (similar to ADC or USB).
But it says "Software" as a source of trigger for DMA transfer.
Can this be used to perfrom SPI data copy?

Thank you,
Vishwanatha

over 13 years ago

0 Todd Anderson78572 over 13 years ago

Guru 14640 points

DMA does not directly support SPI. However, McBSP is supported, and it can be run in SPI mode. I hope that helps.

0 Vishwanatha Manevarthe over 13 years ago in reply to Todd Anderson78572

Expert 1080 points

Hi,
we have a custom board made and it is designed to use SPI unit of the controller. So using another hw unit to emulate SPI is not possible.
Is it possible to direct SPI interrupts to McBSP and then configure DMA to copy the receives data?

0 Kris Parrent over 13 years ago in reply to Vishwanatha Manevarthe

TI__Genius 15260 points

No, that is not possible. Using the McBSP is the only feasible solution.

Kris

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F28069: SPI reception using DMA