Reg Watchdog implementation in mpc5777c

[vignesh_v]

Hi,

   I need to implement watchdog for my application. With reference to datasheet/ref manual of MPC5777C

 i understand that software watchdog can be used for the same. The objective is to load a timer in case of any stuck or error due to some indefinite call of loop (mainly while) or any other segmentation faults. the timer configurable of any say 5-10 secs after that it shall try to clear or exit out of that or reset the entire system. The sw/application uses indefinite while loop and no OS. Can anyone suggest me how to proceed with implementation specific for mpc5777c.

Regards,

Vignesh

[petervlna]

Hi,

Yes SWT is what you need. The implementation is very simple. Just configure  desired timeout base of system clock source an in regular intervals update SWT Service Register (SWT_SR) before the counter expires.

If expire then interrupt or reset is performed on first timeout, on second only the reset.

SWT_A default it is enabled after reset. SWT_B is by default disabled.

Each core implements its own SWT.

Please read chapter 34.5   Functional description of reference manual for implementation hints.

You can also have a look at our example SW:

Example MPC5777C-PinToggleStationery GHS714 

regards,

Peter