application fails to wake up from sleep

RE: application fails to wake up from sleep

kelliott — Wed, 18 Mar 2015 01:51:52 GMT

radio notification priority is high: sd_nvic_SetPriority(SWI1_IRQn, NRF_APP_PRIORITY_HIGH);
The advertising interval for the first couple minutes is 20ms, but we are not advertising when this bug happens. So I really don’t think the interval should be relevant.
We do not get any error code from the call to sd_flash_page_erase.
We are erasing page: 252 (then we will write that page with some configuration data)

I will try to figure out a way to run your project on my board. It won't be trivial, but hopefully by tomorrow.

Thanks

RE: application fails to wake up from sleep

Stefan Birnir Sverrisson — Tue, 17 Mar 2015 13:10:09 GMT

It is not a behavior that is expected or that we recognize immediately. I have tried to reproduce the issue with the description that you have provided, but without luck. I attach my test code. Perhaps you can run my test code on the devices in question on your side to see if you can produce the issue with it.

ble_app_template_with_flash_erase_operation.zip

Have you set priority low for the radio notifications?
What is your advertising interval?
Do you get any error code when you call the sd_flash_page_erase operation?
What flash page are you erasing?

RE: application fails to wake up from sleep

kelliott — Mon, 16 Mar 2015 22:23:45 GMT

Tags: nrf51822, s110, softdevice 6.0.0.

This whole problem happens during our startup process before we start advertising (sd_ble_gap_adv_start). We are not confident that our fix truly resolves the issue, or just masks it.

We don't start advertising until the flash erase/write is complete (in the code both before and after the "fix"). Now we've moved radio notification initialization to a point later in the process, but it is also before we start advertising. I don't expect that sd_radio_notification_cfg_set should cause any radio activity if we haven't yet turned on advertising, correct? So it’s hard to see how it can affect writes to NVM, and it's hard to be convinced that our fix is really a fix.

RE: application fails to wake up from sleep

Stefan Birnir Sverrisson — Mon, 16 Mar 2015 13:53:49 GMT

It seems that you have your case resolved by moving your radio notification initialization just before starting advertising, am I correct?

A flash erase operation takes about 21ms. What is the frequency of your radio events, i.e. what is your connection interval?

What softdevice are you using, type and version?