NRF54L15-DK : How to configured fully Radio Off/Disable ?

[Pratik Panchal]

Hello Nordic Team,

Currently, we are performing power consumption testing using the Nordic nRF54L15-DK development kit.

As part of this, I aim to fully disable the Radio/RF module to evaluate baseline power usage.

To achieve this, I use the smoke_co example, which includes Matter functionality.

To disable the RF module, I attempted the following changes in the code:

/ Fully disable the nRF54L15-DK radio
void disable_radio()
{
    // Stop all radio tasks
    NRF_RADIO->TASKS_DISABLE = 1;

    // Wait until the radio is fully disabled
    while (NRF_RADIO->STATE != RADIO_STATE_STATE_Disabled)
    {
        k_msleep(1); // Wait for the radio to transition to the disabled state
    }

    // Stop the high-frequency clock
    //NRF_CLOCK->TASKS_LFCLKSTOP = 1;

    // Disable radio interrupts
    //NVIC_DisableIRQ(RADIO_1_IRQn);

	if(NRF_RADIO->EVENTS_DISABLED==1)
	{
		printk("Radio fully disabled.\n");
	}
}

void verify_radio_disabled()
{
    if (NRF_RADIO->STATE == RADIO_STATE_STATE_Disabled && NRF_RADIO->EVENTS_DISABLED == 1)
    {
        printk("Radio is fully disabled.\n");
    }
    else
    {
        printk("Radio is not fully disabled. STATE: %d, EVENTS_DISABLED: %d\n",
               NRF_RADIO->STATE, NRF_RADIO->EVENTS_DISABLED);
    }
}

in Overlay file,

&radio {

    status = "disabled";

};

Based on the code above, after calling disable_radio(), we observed the "Radio is fully disabled" message printed from the verify_radio_disabled() function.

After applying these changes, we attempted to pair the nRF device with the Matter OTBR. The device was successfully commissioned using the chip-tool.

After commissioning, we executed the descriptor read client-list 0x2233 0 command.
Received Matter stack-specific logs on the nRF console.

Kindly suggest how we can fully disable the RF/RADIO.

Thanks & Regards,
Pratik Panchal