Timer not initialized after waking up from sleep mode - NRF52833

RE: Timer not initialized after waking up from sleep mode - NRF52833

Susheel Nuguru — Mon, 18 Jul 2022 19:14:32 GMT

sd_power_system_off will put the device in deep sleep. Wakeup from system off will reset the chip and hence your timer will be created again as the chip that wakes from system off executes code from the very beginning (rest handler)

RE: Timer not initialized after waking up from sleep mode - NRF52833

sne_333 — Mon, 18 Jul 2022 12:32:18 GMT

Hi Susheel,

Thanks for your reply.According to your suggesstion I started the timer again using the following commands:-

if(xTimerStart(max17211_handle, 0 ) != pdPASS ) {
// The timer could not be set into the Active state.
}

But still I was not able to see the timer running.

Does "sd_power_system_off" put the device in deep sleep? And if timers cannot be initialted after deep sleep do we have to reset the controller?/

Thanks & Regards,

Snehal.

RE: Timer not initialized after waking up from sleep mode - NRF52833

Susheel Nuguru — Mon, 18 Jul 2022 12:00:26 GMT

Hi Snehal,

[quote user=""] I am using NRF52833 in my project. When the device is in idle state it goes in sleep mode[/quote]

I am assuming that you are talking about the idle sleep (and now system off sleep) and also assuming that you are using tickless idle feature in the freertos to sleep.

The timer is created only once at startup. Unless you are waking up from deep sleep (System OFF sleep) you do not need to recreate the timer. The timer_handle is still valid after waking up from idle sleep.

Since you have created a one-shot timer (uxAutoReload = 0), you just start the timer again if you want to start the timer again using the same timerHandle you got from xTimerCreateStatic into xTimerStart.