PPI radio events with SoftDevice Controller

RE: PPI radio events with SoftDevice Controller

Hung Bui — Wed, 22 Oct 2025 12:38:47 GMT

Hi Christian,

I assume you are asking about the radio notification callback feature. It now a Bluetooth library in the SDK: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/libraries/bluetooth/radio_notification_conn_cb.html

There is a sample that you can try https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/radio_notification_cb/README.html#ble-radio-notification-conn-cb

But as far as I know it only give you a callback before the radio event, not after it.

You can still access DPPI but as you mentioned it get reset after every radio event. Here is some info from R&D when suggested a "hack" to use the PUBLISH_TXREADY register:
one hacky way to work around that could be to re-write PUBLISH_TXREADY after every radio interrupt here for example https://github.com/nrfconnect/sdk-nrf/blob/4eb29ffba260d2138cccfa18b59fe92d63e7239a/subsys/mpsl/init/mpsl_init.c#L244
Also there are some debug pin toggling that you can use:
https://docs.nordicsemi.com/bundle/ncs-latest/page/kconfig/index.html#!MPSL_PIN_DEBUG