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Original question:

TDA4VM: Question about mcu domain gpio modules?

TDA4VM: Testing of GPIO pins from WKUP Domain

Octavian Spirlea
Prodigy 20 points

Part Number: TDA4VM

Tool/software:

What are the possibilities for testing the GPIO pins in the WKUP Domain?

Is there a register that shows the value of a certain pin, or the only way is to use an oscilloscope to measure the respective pin?

 

  • 0
    TI__Mastermind 22680 points

    Hi,

    From the block diagram below, you can see the value of a certain pin within the IN_DATA register after the pin is read. Additionally, more information can be found from the second image which includes a snippet from the TRM. If you are using a TI EVM, or if your custom board has this capability, you can connect an oscilloscope to testpoints on the board.

    Thanks,

    Neehar

  • 0 in reply to Neehar Sawant
    Prodigy 20 points

    Thank you for your answer.

    So, considering the above information, I have the following question : 

    If I set the GPIO pin as output, and for example, I set the value to logic-high, will the IN_DATA register still follow the logic value which was set ?

    This is useful if we have a hardware issue and the PIN is shorted to ground(logic-low value), will we be able to detect this behavior with the help of IN_DATA register ? 

    It is not very clear for me, can you please confirm : 

    If we read the IN_DATA register when GPIO is configured as an output, will we read the actual PIN state ?

    Thank you,

    Octavin

  • 0 in reply to Octavian Spirlea
    TI__Mastermind 22680 points

    Hi Octavian,

    If the GPIO pin is set as output, then you will want to access the GPIO_OUT_DATA register for the specific pins and banks. See the below picture:

    Octavian Spirlea said:

    It is not very clear for me, can you please confirm : 

    This excerpt is specifically for GPIO pins configured as input and will not apply to your situation.
    Thanks,
    Neehar