Request sample project for interrupt based SPI

[Ubaid_M]

Hi,

I am using an nrf52833-dk for development, and I need to work out interrupt based SPI.
Can you kindly point me to an nCS based sample project for interrupt based SPI with all the configurations prl.conf, .overlay, main.c and the code..?!

Thanks in advance,

[Amanda Hsieh]

Hi, 

Perhaps this sample could be tailored for such need: https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/boards/nrf/nrfx_prs

Only these functions should stay: https://github.com/nrfconnect/sdk-zephyr/blob/main/samples/boards/nrf/nrfx_prs/src/main.c#L256-L310, and
this part of main: https://github.com/nrfconnect/sdk-zephyr/blob/main/samples/boards/nrf/nrfx_prs/src/main.c#L319-L324, plus a call to background_transfer (this name can be changed), of course. 

In prj.conf, you only need this line: https://github.com/nrfconnect/sdk-zephyr/blob/main/samples/boards/nrf/nrfx_prs/prj.conf#L9

Regards,
Amanda

[Ubaid_M]

Hello Amanda,

I can see that for the example suggested 

Amanda Hsieh said:

this sample

GPIO interrupt is configured based on which SPIM or UART operations are being performed.

Rather, I was looking at SPI interrupts, now for example,

1. Do nordic boards provide SPI interrupt enable register, to enable interrupts over SPI TX & SPI RX operations..?

2. If not, can we write "IRQ_Connect( )" externally to generate an interrupt for events on SPI TX-RX buffers, So that based on that interrupt, i can perform SPI operations like SPI_Transceive( ),..?

Now, does doing point number 2, make any sense..?
Since nordic SPI driver is already working on DMA.

So I want to understand from SPI interrupts perspective. So that I can exploit interrupts for SPI operations, rather than polling on SPI buffers continually.

Kindly suggest.

Thanks,

[Amanda Hsieh]

Hi, 

See https://infocenter.nordicsemi.com/pdf/nRF52833_PS_v1.5.pdf

There are 
SPI.INTENSET,
SPIM.INTENSET
SPIS.INTENSET

Regards,
Amanda

[Ubaid_M]

Hello Amanda,

Thank you for the pointers,

Now I need your help in understanding if nCS's zephyr SPIM nordic driver is already using the interrupts you have mentioned:

Amanda Hsieh said:

SPIM.INTENSET

Thanks,

Ubaid

[Ubaid_M]

Basically, if i call spi_read( ), i must call in a thread context, to keep on checking if my rx buffer is full or not,
That takes up a lot of scanning time from my application.

Hence, how can i get to know if data is available in RX buffer & only then call spi_read( ) on data availability.