When app timer handling its ISR，can ble observer interrupt it？

RE: When app timer handling its ISR，can ble observer interrupt it？

bingehuang — Mon, 01 Jun 2020 15:06:45 GMT

You are right! I set APP_TIMER_CONFIG_IRQ_PRIORITY to 7，and a BLE observer can preempt the app timer IRQ. Thank you so much！^_^

RE: When app timer handling its ISR，can ble observer interrupt it？

Vidar Berg — Fri, 29 May 2020 11:32:30 GMT

All observers are notified in the same SD_EVT_IRQn interrupt context regardless of observer priority. So the APP_TIMER_CONFIG_IRQ_PRIORITY would have to be "lowered" to priority 7 to allow it to be preempted by a BLE observer.

The observer priority determines in which order the various observers are notified. Eg a BLE callback with priority 1 will always get called before a BLE callback with priority 2. Please refer to "Observers and their priorities" for more details.

RE: When app timer handling its ISR，can ble observer interrupt it？

bingehuang — Fri, 29 May 2020 03:02:19 GMT

Thanks for answer!

Now I set APP_TIMER_CONFIG_IRQ_PRIORITY to 6 , and set a ble service observer priority to 2 , the ble observer still can not preempt the timer IRQ handler. A ble write occurs when app timer handling its IRQ，but the ble observer does not report BLE_GATTS_EVT_WRITE until the app timer IRQ done.

Am i missing something？Thank you

RE: When app timer handling its ISR，can ble observer interrupt it？

Turbo J — Thu, 28 May 2020 18:38:53 GMT

Depends on the app timer priority: APP_TIMER_CONFIG_IRQ_PRIORITY

With the default prio (6), the ble observer can preempt the timer IRQ handler.

Edit: As mentioned below, I was mistaken about the SD event IRQ priority, which happens to be 6, too. Thus by default the timer evens cannot be preempted unless APP_TIMER_CONFIG_IRQ_PRIORITY is configured to be 7.