How to use saadc nrfx_saadc_buffer_convert with softdevice

[jca]

Please some an example or tutorial how to use nrfx_saadc_buffer_convert with softdevice enabled.

[Kenneth]

Hi,

You can find that the ble_app_proximity example in nRF5 SDK use the adc driver to measure VDD. If you want to migrate from the adc driver to nrfx this guide may be useful:
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.0/nrfx_migration_user_guide.html

Also check out this thread:
https://devzone.nordicsemi.com/f/nordic-q-a/38956/15-2-proximity-example-nrfx-saadc-driver-not-updating-battery-service-value

Best regards,
Kenneth

[jca]

the blocking function nrf_drv_saadc_sample_convert works

the non-blocking nrf_drv_saadc_buffer_convert does not jump to the event handler function

settings saadc:

saadc_conf.resolution = NRF_SAADC_RESOLUTION_10BIT;
saadc_conf.interrupt_priority = APP_IRQ_PRIORITY_LOWEST;
saadc_conf.low_power_mode = false;
saadc_conf.oversample = NRF_SAADC_OVERSAMPLE_32X;
	
ret_code_t err_code = nrf_drv_saadc_init(&saadc_conf, saadc_event_handler);
APP_ERROR_CHECK(err_code);

settings channel:

batt_channel_conf.resistor_p = NRF_SAADC_RESISTOR_DISABLED;
batt_channel_conf.resistor_n = NRF_SAADC_RESISTOR_DISABLED;
batt_channel_conf.gain = NRF_SAADC_GAIN1_6;
batt_channel_conf.reference = NRF_SAADC_REFERENCE_INTERNAL;
batt_channel_conf.acq_time = NRF_SAADC_ACQTIME_3US;
batt_channel_conf.mode = NRF_SAADC_MODE_SINGLE_ENDED;
batt_channel_conf.burst = NRF_SAADC_BURST_ENABLED;
batt_channel_conf.pin_p = NRF_SAADC_INPUT_VDD;
batt_channel_conf.pin_n = NRF_SAADC_INPUT_DISABLED;
	
err_code = nrf_drv_saadc_channel_init(0, &batt_channel_conf);
APP_ERROR_CHECK(err_code);

[Kenneth]

Check out the documentation: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.0/hardware_driver_saadc.html#saadc_nonblocking