Problem of communication via SPI between nRF5340dk and ADS1298

[@kar]

Hello everyone,

I'm working on a project right now and I want to use the ADS1298 analog to digital converter and configure it with NRF5340dk. Being a beginner I looked for libraries already developed for that, I didn't find any! and I found a similar example but for the NRF52(GitHub - imcort/NRF52832_ADS1298: ADS1298 EMG Acquisition Device). I said to myself that maybe I can take this library ADS1298 already ready for the NRF52, modify it and adapt it for the NRF5340dk to make my application work, except that I realize that the drivers SPI, PPI, gpiote, queue ... are not the same. I use nrfx_spim, nrfx_spis, nrfx_gpiote and I can't find it for ppi and queue and it blocks me.

Do you think I'm on the right track?
Do you have any examples, solutions or tips to give me?

I thank you in advance ;)

[Einarh]

Hello

This example you're linking to seems to be written for the nRF5 SDK, but since you're working with nRF5340 you'll want to use the nRF Connect SDK (NCS) which uses Zephyr:

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/getting_started.html

So to get the functionality you want up and running you'll want to look into the APIs you need in Zephyr, which are luckily usually pretty easy to use:

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/reference/index.html

Let me know if you have trouble getting started, and good luck on your project!

Best regards,

Einar

[@kar]

thank you very much for your reply ! your help is very precious to me 

 In http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/reference/index.html I search for PPI driver I find nrfx_ppi.h and when I do this : 

nrf_ppi.h oppens and  it shows me this errors :

and I can't find the queue module !! 

[Einarh]

For the PPI module please look through the nrfx PPI API and find the functions you need yourself.

This is not the same API as the example was using, so you can't just copy paste the code and expect it to work, you'll have to find functions in the API to replace the functionality.

What does the queue module do? There is probably something similar in Zephyr, but it might be called something else.

-Einar

[@kar]

(sorry if I don't understand quickly enough, this is the first time I'm using NRF and I'm not yet well adapted to its environment).

I understand what you mean, I didn't just copy and paste the code, I just try to add
nrfx_ppi API (# include<nrfx_ppi.h>) to access the functions I need.

for the queue module: developer.nordicsemi.com/.../queues.html.

[Einarh]

It looks like you're still using the nRF5 SDK, there is no nrf_ppi.h in NCS.

You won't be able to use this SDK with your device, please switch to the nRF Connect SDK, I recommend using the nRF Connect extension in VSCode:

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/getting_started.html

When you're up and running in the correct SDK, I believe the queue API is part of kernel.h in Zephyr.

Best regards,

Einar

[@kar]

I use nRF connect SDK 1.7.0 in SEGGER Embedded Studio.
Regarding PPI: after some research I found this: devzone.nordicsemi.com/.../ppi-package-errors.
so normally it's ok for PPI.
Now, as there is no nrf_queue.h (just like the ppi problem), I hope to find its equivalent too (nrfx_queue if it exists or....).

What do you recommend?

Thank you so much ;)

[Einarh]

Does the queue API you linked to earlier have the functionality you need? ;)

http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/reference/kernel/data_passing/queues.html

I believe you only have to include kernel.h to use it.

[@kar]

Indeed, I see that the functions k_queue_append and k_queue_remove do exactly the same thing as nrf_queue_push and nrf_queue_pop respectively. that's what I need! It's great!

To conclude:
1- The nRF5340 has a DPPI device and not PPI like the older nRF51/nRF52 series circuits. There is a separate driver for DPPI in nrfx, you can refer to this Zephyr example: github.com/.../main.c.
2- in karnel.h you can find all the functions equivalent to those defined in nrf_queue.h.

thank you very much, for your support.