sdk14 radio notification unstable

[Rbai]

I am using radio notification to change every advertisement packet. Here is my code:

static void on_ble_radio_active_evt(bool radio_active) { if (radio_active) { advertising_data_init(); m_dynamic_adv_counter++; } }

int main(void) { ... err_code = ble_radio_notification_init(APP_IRQ_PRIORITY_LOW, NRF_RADIO_NOTIFICATION_DISTANCE_1740US, on_ble_radio_active_evt); ... }

advertising_data_init() simply fills the advertisement packet using the m_dynamic_adv_counter.

The advertisement packets are configured 1 second interval. So most of the time I can see the on_ble_radio_active_evt() gets called every 1 sec, and things are working as expected. But from time to time, this function gets called continuously for several seconds, eg, gets called 50 times in 5 seconds. Then it comes back to the normal once in a second frequency. How can I make this consistent? Is this a bug or I am doing something wrong?

Thanks for help.

[Hung Bui]

Hi Rbai,

If you have a look at the softdevice release note, "Limitations" you can find that:

If Radio Notifications are enabled, flash write and flash erase operations initiated through the SoftDevice API will be notified to the application as Radio Events (FORT-809).

I suspect the irregular period of 5 seconds could be related to flash activity in your application?

Could you please check if you have any code doing flash in the period ?

[Rbai]

I checked but we do not write to flash in our app. I think you should be able to see it by just running a simple advertiser and print something in the on_ble_radio_active_evt(). You should see sometime there is a flood of prints in COM port console. Due to this issue we are currently not using this radio notification method.

[Hung Bui]

Could you provide an example so that we can reproduce the issue here ?