RE: How to feed/refresh Watchdog during BLE activities

beemavishnu — Mon, 24 Jun 2019 12:37:35 GMT

Thank you for your inputs.

Sorry

1) Is there any example enabling RADIO events. How the events are triggered.

2) Is this same as "11 Radio Notification" section in S132 Soft Device User guide.

haakonsh — Mon, 24 Jun 2019 11:58:38 GMT

Use RTC to trigger an interrupt, and in that interrupt, you set a global flag. Then check for that flag in your main loop, if it's set then feed the watchdog. This way you will be feeding the watchdog from mains context at regular intervals, even if you're in at sleep in SystemON.
These are events that are triggered at a set time before the RADIO will be used. They are used to notify the application that there will be RADIO activity in x amount of time. See sd_radio_notification_cfg_set
When you call sd_app_evt_wait() the system will enter SystemON mode, but, it will only return if the wake-up source is anything other than a wake-up source that is needed for the BLE stack.
That is the expected behavior, the WTD will count down when the CPU is active. See Temporarily pausing the watchdog.