How to calculate the watchdog timeout

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How to calculate the watchdog timeout

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建宽高
Contributor III
  • As the title suggests ,How to calculate the watchdog timeout?  or What api are available to provide timeout?

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danielmartynek
NXP TechSupport
NXP TechSupport

Hi,

I have difficulties to understand, can you please elaborate?

Thanks,

Daniel

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建宽高
Contributor III

sorry , I didn't express my meaning

In the S32k144 environment, how does the watchdog timeout calculate, 

Can provide the relevant calculation formula about watchdog time out

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danielmartynek
NXP TechSupport
NXP TechSupport

Hello,

The timeout depends on the

  • WDOG clock source (WDOG_CS_CLK),
  • on the prescaler if enabled (WDOG_CS_PRES),
  • and on the value in Timeout Value Register (WDOG_TOVAL).

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You can use the SDK WDOG driver:

pastedImage_4.png

Please refer to wdog_interrupt_s32k144 SDK example in S32 Design Studio:

pastedImage_5.png

Regards,

Daniel

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建宽高
Contributor III

yes, i know about your reply

i know  watch timeout about  clock,prescaler and timeout value

can you provide calculation formula about wdg timeout?

such as

timeout = (1/(clk/(prescaler+1)) ) * timeout_value      (ms)  ?

 

is ths right?

thank you for your reply!   ☺

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danielmartynek
NXP TechSupport
NXP TechSupport

Hi,

timeout (s) = (1 / clk) * TOVAL 

or

timeout (s) = 256 * (1 / clk) * TOVAL

pastedImage_1.png

Regards,

Daniel

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bjrajendra
Senior Contributor I

Hi Daniel,

I would like to know for a TOVAL of 2 with PRESCALAR Enable what exactly will be the watchdog timeout period.

Also can you kindly elaborate when the two formulae will be used you mentioned above?

Thanks in advance,

Raju

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