How to calculate the watchdog timeout

[建宽高]

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

[danielmartynek]

Hi,

I have difficulties to understand, can you please elaborate?

Thanks,

Daniel

[建宽高]

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

[danielmartynek]

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).

You can use the SDK WDOG driver:

Please refer to wdog_interrupt_s32k144 SDK example in S32 Design Studio:

Regards,

Daniel

[建宽高]

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!   ☺

[danielmartynek]

Hi,

timeout (s) = (1 / clk) * TOVAL 

or

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

Regards,

Daniel

[bjrajendra]

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