Compiler/MSP430FR6972: The question of MSP430FR6972's WDT Reset

Jent

Part Number: MSP430FR6972

Tool/software: TI C/C++ Compiler

Hello，Masters

I have a problem which the cpu is always reset . First the program is running normally and the WDT is opreation. After some hours or some days , the CPU starts to reset again and again. It couldn't be normal any more . Unless the programs run the codes as flowing , the cpu will be normal again .

PMMCTL0_H = PMMPW_H;
PMMCTL0_L |= PMMSWPOR;
PMMCTL0_H = 0;

So, I think that WDT REST couldn't clear the RAM, PMMSWPOR could clear the RAM, is right? If It is right, I think that some wrongs make the datas in the RAM Incorect .

What do you think about the phenomenon ?

Best Wishes

Jent

over 4 years ago

0 Wei.Jetim Zhao over 4 years ago

TI__Genius 13215 points

Hi Jent,

It seems your code is running into some loop issue to prevent clearing the watchdog timer, so that the watchdog timer trigger the reset. The code you run to let CPU be normal is actually trigger a software POR, which should clear the current loop issue.

0 Jent over 4 years ago in reply to Wei.Jetim Zhao

Intellectual 660 points

thank you Wei,

As you said, Why the WDT RESET couldn't clear the loop issue ?

BestWishes
Jent

0 Wei.Jetim Zhao over 4 years ago in reply to Jent

TI__Genius 13215 points

Hi Jent,

As for your description, the watchdog will trigger a PUC reset but below code you used will trigger a POR reset. You may check you code running for the difference between these two reset type for your system condition, such as register error or some status in memory. I see you are asking a related question and I've replied you on that thread.
PMMCTL0_H = PMMPW_H;
PMMCTL0_L |= PMMSWPOR;
PMMCTL0_H = 0;

0 Wei.Jetim Zhao over 4 years ago in reply to Jent

TI__Genius 13215 points

Hi Jent,

I haven’t heard from you for about 10 days, so I’m assuming you were able to resolve your issue. If this isn’t the case, please click the "This did NOT resolve my issue" button and reply to this thread with more information. If this thread locks, please click the "Ask a related question" button and in the new thread describe the current status of your issue and any additional details you may have to assist us in helping to solve your issues.

0 Jent over 4 years ago in reply to Wei.Jetim Zhao

Intellectual 660 points

thank you master zhao,
l think the problem is resolved. The program has runned ten days without resetting.
thank you for your helps again.

jent

0 Wei.Jetim Zhao over 4 years ago in reply to Jent

TI__Genius 13215 points

Hi Jent，

Good. Please feel free to come back to E2E when you meet further issue.

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Compiler/MSP430FR6972: The question of MSP430FR6972's WDT Reset