Detect if code has been interrupted by Softdevice

[Jacob A]

Hi,

I there a way that I can detect if a sections of my code has been interrupted by the Softdevice? I have some time critical code (bit banging a communication protocol), and it's important for the timing, that it's not interrupted at certain points.

I want to check if an interrupted has occurred, and the possibly retry my operation.

Using CRITICAL_REGION_ENTER is not enough, as it only disables application interrupts, and not the ones used by the Softdevice. Is the safe to __disable_irq while the advertisement is active?

Another way of approaching my problem, is to make sure there is enough time before the next interrupt by the advertising service. Is there some way that I calculate the time till next interrupts, or possibly the time since last interrupt?

Best, Jacob

[Stefan Birnir Sverrisson]

Hi

I think there are two ways of having your operation not interrupted by the softdevice.

• Use the radio notifications, which will give the application an event some predefined time before a BLE connection event/advertising event.
• Use Timeslot API where you can execute code with highest priority in timeslots between BLE connection events/advertising events. The Timeslot API is described in the S110 SDS.

I include two examples, one for radio notifications, example is developed for nRF51 SDK 6.1.0, the other one for Timeslot API, example is developed for nRF51 SDK 6.0.0

ble_app_template_with_radio_notification.zip
ble_app_hrs_with_timeslot.zip

[hawk]

hi,I also found that the ble advertising interrupt my Timer1 handler... sdk 5.2.0 can support timesSlot API.??

[Stefan Birnir Sverrisson]

@Hawk

No, timeslot API is not supported for SDK 5.2.0, as SDK 5.2.0 is compatible with S110 6.x.x softdevice. Timeslot API was first introduced in S110 7.x.x, see the nRF51 compatibility matrix. First SDK to support S110 7.x.x is SDK 6.x.0