Check a status of Watchdog in TM4C123

Sky Kim

Intellectual 320 points

Hello, I am Sky.

Now, I am implementing a watchdog function in TM4C123.

I set WatchdogResetEnable(WATCHDOG0_BASE).

I hope that when watchdog timer is timed out, it will reboot after a few seconds.

Then, I have a question.

How can I discriminate between watchdog reset and manual reboot (or first booting)?

If reset is caused by watchdog timer, I would like to implement additional settings in main function.

Is there any register to notify this information?

Please answer my question.

Thanks in advance.

-Sky

over 8 years ago

0 Robert Adsett over 8 years ago

Guru 27665 points

Check the TIVAWare manual, there is a call that will read the reset source register.

Robert

0 Amit Ashara over 8 years ago

TI__Guru**** 244400 points

Hello Sky

The source of a reset is logged in the System Control Module RESC (Reset Cause) register,

0 Sky Kim over 8 years ago

Intellectual 320 points

Thanks for all!

In main function, I am able to check reset cause via SysCtlResetCauseGet() function.
We can simply implement this routine as below:

bool watchdogReset = (SysCtlResetCauseGet() & SYSCTL_CAUSE_WDOG0);

bool softwareReset = (SysCtlResetCauseGet() & SYSCTL_CAUSE_SW);

-Sky

+ Updated: I changed my code from hard coded value to defined value

0 Amit Ashara over 8 years ago in reply to Sky Kim

TI__Guru**** 244400 points

Hello Sky,

Instead of using hard coded values for bit masking, use the defines for the bit positions as given in sysctl.h

That would allow for seamless update when positions change.

Arm-based microcontrollers

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Check a status of Watchdog in TM4C123