Ok, so I've been trying to get to the bottom of a problem for a few days now where suddenly the app_timer is acting like it's on crack and running super fast, i.e. triggering events instantly.
prescaler=0, no scheduler, sd initalized with SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_250_PPM, NULL);
For example, I am using the bsp library for button events and on a 'press' I start a timer for 3277 ticks (100ms) so that I can time how long the button is being pressed. As long as the button stays pressed, the timer will restart for another 3277 ticks. Once the button is 'released' I call a function for something to happen (depending on how long the button was pressed). When the problem occurs, the button handler fires instantly, and keeps on restarting the 3277-tick timer over and over again.
Other timers will do the same thing. I have one that checks battery level (adc) every 10 seconds that also gets called over and over again.
Also, a bsp led for advertising that is supposed to blink once every 5 seconds, ends up basically solid.
Eventually, everything sorts itself out. But that can take anywhere from 30 seconds to a few minutes. Either way, something is going wrong I have not been able to figure out what.
So far this has only happened when the device isn't doing anything (advertisements have timed out and the soft device is idle). At that point the only thing running is an 8-minute singleshot timer where I increment a counter and restart the timer every 8 minutes. During this time, when I press a button is when the problem occurs, but not every time... I've traced the code with printf's and everything looks good (app_timer_start gets called with the correct values, etc.)
Is something going to sleep during the idle time that could mess up app_timers? Does the clock that app_timer uses go to sleep and require some wake-up time? I don't explicitly stop the soft device, clock, or anything. The device is in power_manage(), except when it wakes up the every 8 minutes.
Some sort of race condition where what's put into the app_timer queue immediately gets executed?
