Wonderful! another technical youtuber here. I didn't get what you said, can you elaborate or give some reference? In the company I work some teams use this and some do not. They say wwdg is for software faults.

@@vb9950 that is correct WWDG is more for software faults but for example if what is causing the software fault is a hardware device like external sensor or something is messing up SPI and only way to fix it is to reset the system..idk just an example. you would use WWDG to catch the software part and do some clean up in the interrupt handler and eventually let the IWDG trigger so the system can reset. so you get best of both worlds , the ability to clean something up or maybe warn the user the system is about to reboot and do it gracefully

@@EdwinFairchild thanks, but i don't understand how to catch software faults with wwdg? U have any idea?

@@powerstar817 ok here is an example.. lets says you have 3 functions, function 1is doing some math, function 2 perhaps controlling a motor, and functon 3 maybe sending data to pc via UART... at the end of every function you feed the WWDG, because remember a watchdog is just a timer that you cannot let it go to zero , so you always set it back to a high value and it will start counting down... So at the end of each function you set the WWDG to a high number and everything is ok, it never reaches 0. If however one of your functions hangs/freezes then the wwdg will never get fed and thus trigger an interrupt , in this interrupt you can maybe do some housekeeping stuff before reset, or all together fix things and not trigger the reset..etc...... However when using something like an RTOS this approach will fail and this is where you would need to use both a WWDG and an IWDG , or simply the WWDG with a little more careful thinking... I can make a video on this sometime to demonstrate

@@EdwinFairchild it clear now. Yes here iwdg can act like a monitoring watchdog or a spare wdg.

Plz watch the video. It's explained in it.

13 to 20 is the window. Outside it, the system will reset..

It's modified from the one ST have in the reference doc.. Check that out.

@@ControllersTech Okay. How to calculate the window value for IWDG?

Common man.. just watch the video... It's what i have explained there.

and how can we observe those changes while running the code?

Sorry, You have explained window Value calculation for WWDG, not for IWDG. if we enable window option for IWDG how can we calculate? For IWDG you explained only reload value.