TWI - Easy DMA

[Roei]

Hi,

I have some troubles using TWI easy DMA. I set EASY_DMA flag to 1, but I can't see any results in my performance tests. Can anyone explain me the required steps?

Thanks!

[Martin Lesund]

Hi Roei,

I would like you to take a look at the TWI master documentation and then go through this thread and the links posted on how to use TWI eDMA.

[Roei]

Hi Martin, thanks for the response!

I went through your links, and I still have the same questions:
I'm using SDK15.00, with nrfx_twim interface. Do I need to do anything else besides changing EASY_DMA flag to 1, in order to use easy DMA?

Thanks!

[Martin Lesund]

Hi Roei,

If you look at the TWI sensor example you can see that the:

// <q> TWI0_USE_EASY_DMA  - Use EasyDMA (if present)
 

#ifndef TWI0_USE_EASY_DMA
#define TWI0_USE_EASY_DMA 1
#endif

is set. Please use that example as reference on how you can use eDMA with TWI.

[Roei]

Hi Martin,

Thank you! I tried to work by the example, but I didn't see any performance changes. Do I have a way to see if Easy DMA is now activated?

Thanks!

[Martin Lesund]

Hi Roei,

How are you measuring performance?

Also please check out this thread.