Regarding SPI

RE: Regarding SPI

liuluan1984 — Fri, 11 Dec 2020 12:43:27 GMT

thank you, I will check

haakonsh — Thu, 02 May 2019 14:18:15 GMT

1. Yes. NRFX_SPIM_EXTENDED_ENABLED is only used for D/CX functionality.

3. You will get an event when all bytes has been transferred and all received bytes are present in RAM.

Alan Ajit — Thu, 02 May 2019 11:53:43 GMT

Thanks for your replay. I see the example but i am little bit confusing.

1. I want to enable SPI DMA. I think for enabling DMA SPIX_USE_EASY_DMA set to 1 is it right?

2. if I enable this which API i used to transfer the data through spi?

as per above example i didn't see SPIX_USE_EASY_DMA not set but i see NRFX_SPIM_EXTENDED_ENABLED is enabled. Is this both are same?

3. From your replay you said the event is triggered when full byte transfer complete.is it right?

i need your help i want to know which API used to DMA tranfer ?

haakonsh — Thu, 02 May 2019 09:04:38 GMT

You need to see the nrfx SPI Master Example of SDK15.3.
DMA with SPI just means that the transfer is non-blocking with respect to the CPU. There should be no difference as seen from the SD Card.
Yes, the event handler set up by the SPIM driver will be called after an SPI transfer has been completed and the received data has been moved to RAM.