Hi there,
In our device we are using nRF52832 with SoftDevice S112, SDK 17.0.1 and embOS Safe. Up until now we were working with the “Just Works” setting of BLE connection when using pairing through NFC. We recently tried upgrading to “LE Secure Connections” and have encountered an issue where every once in while upon either successful connection or disconnection, the OS system time stops updating and remains constant. This causes all of our SW timers to remain stuck as well since we are calling OS_GetTime32() and eventually leads to a watchdog reset.
Since this never happened while using “Just Works” type of connection we suspect that there is some conflict between SoftDevice interrupt priority and embOS. We tried upgrading NRFX_RTC_DEFAULT_CONFIG_IRQ_PRIORITY from 6 to 2 (0,1 are reserved to SoftDevice) but it did not help.
Here’s a log example of how it looks like:
I suspect something during those 20 ms between the established connection and the next event triggering is causing some collision between interrupt priority. Any idea what happens behind the scenes during that time?
Speaking with embOS, they asked to check if the SoftDevice stack modifies PRIMASK and/or BASEPRI.
Any insight would be appreciated.