Continuous interrupt on ADC channel with MSP430F67791A

Elakiya Selvaraj

Other Parts Discussed in Thread: MSP430F67791A

We are using MSP430F67791A microcontroller for our e-meter project.The design is very much similar to the development model provided by TI. It is a three phase electrical meter reading application.We have taken the corresponding reference software for the application from TI :

tidm-3phmtr-tamp-esd.rar

We are facing the below issue :

Continuous interrupt from the ADC channels 1,2,3 which are connected to the voltage source for each phase,We even tried commented all the code in the ISR and just cleared the interrupt and discarded the samples,But still Watch dog timer got expired and the application restarted(Disabling WDT also doesn't help).Any suggestion would be highly appreciated

over 10 years ago

0 Katie Pier over 10 years ago

TI__Guru* 83021 points

Hi Elakiya,

Sorry for the delay - I am working to loop in the right person to help with this software.

Regards,
Katie

0 Steve Underwood over 10 years ago

TI__Intellectual 2595 points

I cannot reproduce this. I see only 2 ways you could have continuous interrupts:

The code which reads the ADCMEM registers for the voltage signals is not being executed
The code is being slowed down so much that it cannot complete the processing of one interrupt before the next occurs.

I can suggest some tests to perform, to narrow down the possibilities:

Check the configuration of the projects, and make sure the maximum optimisation is being used.
Set a breakpoint where one of the voltage channel ADCMEM registers is read, and ensure that code is really being executed.
Alter the ADC interrupt routine so it toggles a spare GPIO bit as the code enters and exits the routine. Then you can use an oscilloscope to monitor that pin and check how much time is spent in the interrupt service routine.

0 Elakiya Selvaraj over 10 years ago in reply to Katie Pier

Prodigy 60 points

Thank you.Waiting for your support ASAP.

0 Elakiya Selvaraj over 10 years ago in reply to Steve Underwood

Prodigy 60 points

Thank you Mr.Steve . Let me check with this what would you suggest.

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Continuous interrupt on ADC channel with MSP430F67791A