2 Replies Latest reply on Apr 4, 2016 3:57 PM by hsouders_1431076

DMA transfer to a gpio data register

hsouders_1431076 Aug 18, 2017 3:07 PM

Hi,

I'm playing around with a psoc4m pioneer kit, and I'm trying to initiate a dma transfer from a buffer to a gpio port data register (CYREG_GPIO_PRT0_DR). I couldn't find any documentation specifically saying this won't work, but I haven't had any luck so far. If I'm not using DMA, I can write directly to the port register no problem. Any thoughts? Thanks.

1. Re: DMA transfer to a gpio data register

bob.marlowe Apr 4, 2016 1:03 AM (in response to hsouders_1431076)

Welcome in the forum!

Can you please post your complete project, so that we all can have a look at all of your settings. To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file.



Bob
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2. Re: DMA transfer to a gpio data register

hsouders_1431076 Apr 4, 2016 3:57 PM (in response to hsouders_1431076)
Thanks. I think I actually figured it out on my own after playing around for a bit. It looks like I need to configure the transfer for 32 bits, and then the top 24 bits get dropped. Weird, but I guess that's how it works when dma-ing directly into gpio registers?

Sample code is attached if anyone wants to take a look or has any thoughts.

DMA_MEMCPY_PSoC401.cywrk_.Archive01.zip 623.7 K
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