How to generate Watchdog NMI followed by watchdog Reset

Owain Phillips

Hi All,

till now I have been using the watchdog to cause a watchdog reset.

I now want to switch to using NMI so I can log some information related to the watchdog before causing a system reset.

I have seen how to use NMI rather than System Reset; but can I first get an NMI then after my handling cause an immediate hard reset?
Can I reprogram the watchdog from my NMI handler to force that system reset?

Kind Regards,

Owain

over 10 years ago

0 Charles Tsai over 10 years ago

TI__Guru**** 191886 points

Hi Owain,
In the NMI handler you can generate a software reset by writing to SYSECR register in the SYS module. Software reset is another form of system reset.

0 Owain Phillips over 10 years ago in reply to Charles Tsai

Intellectual 370 points

Hi Charles,

That worked a treat. All I had to add was the calls to reset the error in the ESM.

Many thanks,
Owain

void esmGroup2Notification(uint32 channel)
{
/* enter user code between the USER CODE BEGIN and USER CODE END. */
/* USER CODE BEGIN (3) */
if( channel == 0x18 )
{
esmClearStatus( esmGROUP2, channel );
esmTriggerErrorPinReset();

systemREG1->SYSECR = 0x00008000;
#if 0
/* Reconfigure watchdog to do system reset */
/* and force immediate reset */
rtiREG1->WWDRXNCTRL = (uint32) Generate_Reset;
rtiREG1->WDKEY = 0x0000E51AU;
rtiREG1->WDKEY = 0x00002345U;
#endif
}
/* USER CODE END */
}

0 Charles Tsai over 10 years ago in reply to Owain Phillips

TI__Guru**** 191886 points

Hi Owain,
Glad your problem is resolved.

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How to generate Watchdog NMI followed by watchdog Reset