https://devzone.nordicsemi.com/f/nordic-q-a/4995/how-to-sample-data-with-app_timer-in-irq-but-process-outside-interruptI want to process queued sensor data collected at a fixed interval (every 100ms) via TWI in the background/main loop. In the example ble_app_hrs , timer expiration callbacks run directly in the IRQ. APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERSen-USTelligent Community 13Thu, 08 Jan 2015 12:02:46 GMThttps://devzone.nordicsemi.com/thread/17620?ContentTypeID=1Thu, 08 Jan 2015 12:02:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b5423b25-4760-442d-8a6c-275604900911Stefan Birnir Sverrisson<p>For comments on that , look at <a href="https://devzone.nordicsemi.com/question/24139/are-twi-transfers-of-twi_masterh-blocking/?answer=24161#post-id-24161">this thread</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17619?ContentTypeID=1Thu, 08 Jan 2015 03:11:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:70a55177-551e-4dc8-b7fa-bc2c792914d2la-ble<p>are TWI calls safe to run in interrupt? or MUST they go in main loop?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17618?ContentTypeID=1Wed, 07 Jan 2015 11:50:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:13ab40a3-1abe-415b-b6d9-a0659bf8de59Stefan Birnir Sverrisson<p>Hi</p> <p>As you have pointed out, the app_timer either use the scheduler for all timers or none. You could also mimic the functionality of the app_scheduler by simply setting a flag in your app_timer callback and poll for that flag in the main loop, i.e. when the flag is &quot;true&quot; you perform your TWI operation in main loop.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17617?ContentTypeID=1Mon, 05 Jan 2015 02:56:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc84db43-3a04-4937-847a-9c915e26104bla-ble<p>This post seems relevant: <a href="https://devzone.nordicsemi.com/question/17526/examples-using-the-scheduler/">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>