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MSP432P401R: Port 2 problem with MSP432P401R

Bob Bacon
Genius 10815 points
Part Number: MSP432P401R


Hello
My customer us having problems with Port 2 of the MSP432P401R and tells me

We seem to have an issue that we can only pin down to the processor.

 

We have three LEDs on Port 2.0, 2.1 and 2.2.

 

We have I2C configured on UCB1. Whenever we receive a byte the LED on port 2.0 comes on, when we have finished with the data (no more bytes), we turn it off.

 

We are finding that the LED, even though it has been told to turn off, will stay on, about 20% of the time.

 

We have confirmed this is not a problem with the code by toggling other lines high and low, it is only on this port that it happens, for all LEDs.

 

Do you know if this is a known issue or what might cause this?

They are aware of Errata "PORT31"  and have it as a standard driven (not high drive) GPIO and in output mode. This seems to be the state that it should work in, but it doesn’t. They also have all the other pins on that port as outputs and driven low – as recommended.

Best Regards

Bob Bacon

  • 0
    TI__Mastermind 25045 points
    Hi Bob,

    It looks like they are using their own HW, do you know if they have been able to reproduce the same problem with the MSP432 Launchpad??

    If you can get me their source code, I'll be more than happy to run a few tests on my side.

    Feel free to email me offline with their source code.

    Best regards,

    David
  • 0 in reply to DavidL
    TI__Genius 10815 points

    Hi David
    I've attached a Code Snippet they sent me.

    Regards

    Bob

  • 0 in reply to Bob Bacon
    TI__Mastermind 25045 points

    Hi Bob,

    Unfortunately I have not been able to reproduce this behavior with our Launchpad. Could you please ask you customer to see if they can reproduce this behavior using the MSP432 LP?? I'm trying to confirm that this is not a HW issue.

    This is a snapshot of my logic analyzer.

    Bob Bacon said:
    We are finding that the LED, even though it has been told to turn off, will stay on, about 20% of the time.  

    Is there a way they can hook a logic analyzer to the i2c signals and P2.0??

      Thanks,

        David

  • 0 in reply to DavidL
    TI__Genius 10815 points
    I've just requested a new LP board for them to check this out .
    Bob

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