Trying to use nrfx drivers to read an analog value under ncs 1.6.0

RE: Trying to use nrfx drivers to read an analog value under ncs 1.6.0

Øivind — Tue, 31 Aug 2021 12:57:53 GMT

Sorry for the late reply

Ok, in that case, please take a look at these links for examples on how to use the nrfx driver:

This is not the simplest possible example, but it is written by a Nordic employee, so I know it is good.

This is a simpler implementation I found. It is not written by a Nordic employee, but seems ok at first glance.

Take a look at those, and let me know if you have any trouble.

The issues you are having with the macro can probably be solved like this:

  const nrfx_saadc_channel_t channel_config = NRFX_SAADC_DEFAULT_CHANNEL_SE(NRF_SAADC_INPUT_AIN2, 0);

  err_code = nrfx_saadc_channel_config(&channel_config);

Both the examples I linked also appear to run nrfx_saadc_init() before running nrfx_saadc_channel_config()

RE: Trying to use nrfx drivers to read an analog value under ncs 1.6.0

JonasForssell — Fri, 27 Aug 2021 17:48:34 GMT

Hello Öivind,

First I would like to complement all the support personnel at Nordic for your always pleasant and helpful support. I really appreciate it.

We are using the nrf5340 in a development project at my company. It is a fantastic piece of hardware. We selected it for two reasons: 1. It has the possibility of developing custom wireless protocols. 2. It has very powerful low level peripherals.

For 1. we are using the nrfx libraries. For 2. I am trying to do the same but it has been difficult due to the shift to Zephyr and ncs.

The controller I am writing for 2. will require very fast PWM response (where Zephyr level was too slow) and which I finally solved with the support from Nordic in this ticket and I would really like to keep the ADC development on the same level and not bring in Zephyr. In fact I have tried to go down further to an even lower level in this ticket

Many thanks!

/Jonas

RE: Trying to use nrfx drivers to read an analog value under ncs 1.6.0

Øivind — Thu, 26 Aug 2021 07:55:20 GMT

Hi,

That video showcases the nRF5 SDK, while the nRF5340 only uses the newer nRF Connect SDK. With NCS, using the nrfx driver directly is a lot more complicated than using the zephyr api for the driver. Have you looked at the adc sample located at zephyr/samples/drivers/adc? This overlay file should get the sample working with the nrf5340dk: devzone.nordicsemi.com/.../8357.nrf5340dk_5F00_nrf5340_5F00_cpuapp.overlay

Rename the file to just "nrf5340dk_nrf5340_cpuapp" if it is downloaded with a different name.