NRF_APP_PRIORITIES etc. removed in SDK 11?

[Nikolaus Wittenstein]

The SDK 11 s13x migration document says:

The enumeration NRF_APP_PRIORITIES has been removed. Application developers must use the interrupt priority levels directly instead.

For s130 the interrupt priority levels available to the application are: 1 and 3.

Other types were also removed, leading to e.g. the radio notification build problems. I'm just curious if there was a reason for this change.

(Sadly, after I finished merging all the new code in I discovered that the new S130 is 12k bigger than the old S110. Looks like I'll have to stick with SDK 10 on my tiny 128k chip.)

Thanks!

[tesc]

Hi,

I do not know the reason why NRF_APP_PRIORITIES was removed, but if you use the SDK you can now use the priorities from the app_irq_priority_t enumeration in <sdk folder>\components\libraries\util\app_util_platform.h:

APP_IRQ_PRIORITY_HIGHEST
APP_IRQ_PRIORITY_HIGH       // Replaces NRF_APP_PRIORITY_HIGH
APP_IRQ_PRIORITY_MID
APP_IRQ_PRIORITY_LOW        // Replaces NRF_APP_PRIORITY_LOW
APP_IRQ_PRIORITY_LOWEST
APP_IRQ_PRIORITY_THREAD     // Priority level of the MAIN context

The actual values depend on whether or not you use a SoftDevice, and if the SoC is an nRF51 or an nRF52. If using the softdevice, the (distinct) levels for the application are:

For nRF51:

APP_IRQ_PRIORITY_HIGH
APP_IRQ_PRIORITY_LOW
APP_IRQ_PRIORITY_THREAD

For nRF52:

APP_IRQ_PRIORITY_HIGH
APP_IRQ_PRIORITY_MID
APP_IRQ_PRIORITY_LOW
APP_IRQ_PRIORITY_LOWEST
APP_IRQ_PRIORITY_THREAD

PS: While looking at this I found that in SDK 11 the value for APP_IRQ_PRIORITY_HIGHEST is incorrectly set. If using a SoftDevice the value conflicts with the highest SoftDevice priority level. If not using a SoftDevice it does not add a priority level. To correct this you must change the #ifdef on line 60 in app_util_platform.h to an #ifndef.

Regards, Terje

[Carles]

The reason why priorities were removed from the SoftDevice is that, with the introduction of the Cortex-M4 on the nRF52 it became difficult to maintain a priority set without imposing a priority distribution to the application.

Instead now in app_util_platform.h, as Terje mentioned, you can find a full set of priorities that work no matter your configuration.

The radio notification type changes were introduced both as a result of feedback from our support engineers to make it clearer what each type meant, and for consistency with the rest of the APIs.

(Sadly, after I finished merging all the new code in I discovered that the new S130 is 12k bigger than the old S110. Looks like I'll have to stick with SDK 10 on my tiny 128k chip.)

Well, it does pack in quite a bit more functionality. The SD release notes always state the flash size of the SoftDevice itself.

[Nikolaus Wittenstein]

Ole Bauck adds a good point about why enums were removed in devzone.nordicsemi.com/.../