nRF54L15 ADC acquisiton time issues

[JamieHartshorne]

Hi, I am trying to set my acqtime different to the max value. And the build throws an error unless i set it to ACQTIME_MAX.

It appears in the header file it needs some other values that i dont seem to have defined? How could i get this working for the NRF54L15, i am working on porting the project from the nrf52840dk to this board. I am using the 3.0.1 SDK. My guess is im missing some sort of definition somewhere but I can't seem to find where. The header file wants values for variables in the form of SAADC_CH_CONFIG_TACQ_5us etc.

    channel.channel_config.gain = NRF_SAADC_GAIN1_4;

    channel.channel_config.acq_time =   NRF_SAADC_ACQTIME_5US;

[Einar Thorsrud]

Hi,

Can you share more about how you use the SAADC? If you refer to the this ADC sample, you can modify the configuration slightly to use GAIN 1/4 and 5 us acquisition time, and that works when I test on my end with these changes to channel 0 modified like this in the overlay file:

	channel@0 {
		reg = <0>;
		zephyr,gain = "ADC_GAIN_1_4";
		zephyr,reference = "ADC_REF_INTERNAL";
		zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 5)>;
		zephyr,input-positive = <NRF_SAADC_AIN4>; /* P1.11 */
		zephyr,resolution = <10>;
	};

[JamieHartshorne]

https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-6-analog-to-digital-converter-adc/topic/exercise-3-interfacing-with-adc-using-nrfx-drivers-and-timer-ppi/

hi Einar, I am essentially following this guide. I am using the nrfx drivers

    /* STEP 4.7 - Change gain config and set acquisition time in default config and apply channel configuration */

    channel.channel_config.gain = NRF_SAADC_GAIN1_4;

    channel.channel_config.acq_time =   NRF_SAADC_ACQTIME_MAX;

    err = nrfx_saadc_channels_config(&channel, 1);

    if (err != NRFX_SUCCESS) {

        //LOG_ERR("nrfx_saadc_channels_config error: %08x", err);

        return;

    }

i just ended up replacing acqtime with the number 5 and it worked for a 5us sample rate so i guess thats fixed it. although its odd the enum doesnt work anymore