watchdog driver initialize of SDK cost too much time

[DavidShu]

when i do watchdog init, it cost about 7.5ms time more than expected.

"while (!WDOG_IsReconfigurationComplete(base))" which code is part of WDOG_Config() subroutine in wdog_hw_access.c when you call WDOG_DRV_Init() is the real fact which cost 7.5ms.

But, when i look at the watchdog driver in NXP MCAL, it has no while() loop in Wdg_Wdog_Init() subroutine.

So, my questions is:

1).is the waitting of "last configuration of the WDOG was successful" necessary when do watchdog configuration in SDK?  

2).is there any other good idea to kill the 7.5ms wait time?

[Robin_Shen · Accepted solution]

Hi shuwei,

1. Yes. It's necessary.

2. The number of cycles it takes for the RCS flag to set should be:

If you want to reduce the wait time, please switch clock source and disable Watchdog prescaler(PRES=0).

Best Regards,
Robin
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[DavidShu]

Hi Robin，

Thx your suggestion，i choose to close WDG clock prescaler and increase timeout counter. Now the RCS waiting time really decrease to 1/256 of before.

But i still have doubt: the NXP MCAL driver of WDG did not have RCS wait time when WDG config done (Wdg_Wdog_Init() subroutine in Wdg_Wdog.c source file) , is there any problem ?

MCAL Build Version: S32K14x_MCAL_1_0_1_RTM_ASR_REL_4_3_REV_0001_20190621

[Robin_Shen]

Hi shuwei,

Thank you for the report, I have consulted it with our AE team.
Confirmed by the AE team: MCAL version 4.0 fixed this issue, but MCAL version 4.3 still have this problem. It has been reported to the development team.
Sorry for the inconvenience we bring you!

Best Regards,
Robin
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[DavidShu]

Hi Robin,

Got it, thanks for your latest information!