Radio notification only after BLE radio

[Geir Strand]

I'd like to get a notification every time after the radio has been active (as shown as NACTIVE in the S110 rev 1.3 spec). How can I make this mappen?

I see two functions available: sd_radio_notification_cfg_set and ble_radio_notification_init. Are these two functions supposed to work together or should we only use the ble_radio_notification_init? This does not have configuration of the notification events, only the distance to next active radio period...

[Nikita]

Like this:

bool current_radio_active_state = false;

void ble_on_radio_active_evt(bool radio_active)
{
    current_radio_active_state = radio_active;
}

static void radio_notification_init(void)
{
    uint32_t err_code;

    err_code = ble_radio_notification_init(NRF_APP_PRIORITY_LOW,
                                           NRF_RADIO_NOTIFICATION_DISTANCE_800US,
                                           ble_on_radio_active_evt);
    APP_ERROR_CHECK(err_code);
}


int main(void)
{
...
    radio_notification_init();
...
}

[kmorris]

So, just asking for clarification. If I use this example to set ble_radio_notification_init in conjunction with sd_radio_notification_cfg and set the TYPE to NRF_RADIO_NOTIFICATION_TYPE_INT_ON_INACTIVE, it will ignore the distance setting and provide a radio notification on inactive?

[Nikita]

You can just use standard ble_radio_notification_init function, that already calling sd_radio_notification_cfg inside, it will generate interrupts on both inactive to active and active to inactive events and you can determine the event type with radio_active value in ble_on_radio_active_evt handler.

UPD:

NRF_RADIO_NOTIFICATION_DISTANCE_NONE can only be used when the event does not have a notification. NRF_RADIO_NOTIFICATION_DISTANCE parameter is only distance before radio activity and there shoudn't be delay with interrupt after radio activity. Here is written: "The distance from the active notification to start of radio activity."

I have done some more debug'ing here, and the radio_active flag seems to be true if one has a connection active. Hence, there is no way to determine if the interrupt happens before or after the radio transmission.

Why? When ble_on_radio_active_evt handler will be called with (radio_active == true) it means that now after NRF_RADIO_NOTIFICATION_DISTANCE_XXX time will be radio activity. If ble_on_radio_active_evt handler will be called with (radio_active == false) it means that radio activity ended and now radio is inactive.

[Geir Strand]

I have done some more debug'ing here, and the radio_active flag seems to be true if one has a connection active. Hence, there is no way to determine if the interrupt happens before or after the radio transmission. In addition, I tried using NRF_RADIO_NOTIFICATION_DISTANCE_NONE as (they way I see it) this would only happen after a radio transmission. However, by using this I get a parameter error in return.

[Sarah]

When I use this code with SDK 7.1, I get this warning:" warning: implicit declaration of function 'ble_radio_notification_init' 'is invalid in C99". I don't get compilation errors, but I cannot build the project. Why could this be?