Configuring SAADC on NRF9160 using the lower level driver instead of Zephyr

RE: Configuring SAADC on NRF9160 using the lower level driver instead of Zephyr

Marciano-PL — Tue, 07 Jan 2020 19:42:34 GMT

I misunderstood your answer! It worked perfectly for me. I hadn't realized that your proposed solution enabled me to use the original nrfx_saadc_event_handler_t the way the api intended. I thought I had to do it differently. Thanks for the help!

RE: Configuring SAADC on NRF9160 using the lower level driver instead of Zephyr

Håkon Alseth — Mon, 06 Jan 2020 07:39:10 GMT

Hi,

Sorry for the late answer.

saadc_handler, is that in your main.c? How is that implemented? It should be "void saadc_handler(nrfx_saadc_evt_t const * p_event)".

The code posted in my former answer should add the interrupt through zephyr's APIs, but could it be that the nrfx_saadc needs to be enabled using a preprocessor flag?

Could you try appending this to your prj.conf?

CONFIG_COMPILER_OPT="-DNRFX_SAADC_ENABLED=1"

Kind regards,

Håkon

RE: Configuring SAADC on NRF9160 using the lower level driver instead of Zephyr

Marciano-PL — Sat, 21 Dec 2019 00:36:06 GMT

Hello Hakon!

I am facing the same problem, but on the nRF5340. When I attempt this solution, I get a compiler error

conflicting types for saadc_handler

as it follows the signature of

typedef void (* nrfx_saadc_event_handler_t)(nrfx_saadc_evt_t const * p_event);

instead of

__attribute__ ((interrupt ("IRQ"))) void name(void)

How should I write my handler to compensate for the differences in the implementation method you provided above and still be able to have the same functionality?

RE: Configuring SAADC on NRF9160 using the lower level driver instead of Zephyr

Håkon Alseth — Wed, 28 Aug 2019 09:04:28 GMT

Hi,

There are missing components in the integration of nrfx directly into NCS, which we are working on solving. One of these is the interrupt handling. Since there's an RTOS running in the background, we cannot use the NVIC functions directly, so we'll have to declare the interrupt vector for the SAADC in a specific way, similar to what is done here for the PDM (see the last section of that answer):

https://devzone.nordicsemi.com/f/nordic-q-a/50656/using-pdm-mic-on-nrf9160dk/204715#204715

You have to do the same with the SAADC IRQHandler when using it in non-blocking mode using nrfx directly:

ISR_DIRECT_DECLARE(adc_isr_handler)
{
    nrfx_saadc_irq_handler();
    ISR_DIRECT_PM();
    
    return 1;
}

void main(void)
{
    IRQ_DIRECT_CONNECT(SAADC_IRQn, 0,
    adc_isr_handler, 0);
    /* Rest of main */

We are looking into how to do this in a more streamlined way.

Kind regards,

Håkon