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specifying between GPIO 16/32 and 17/33

Audrey Lewis
Prodigy 10 points

How can I specify whether I want GPIO 16 to go high without GPIO 32 also going high? Is there a way to set (for example), J6:P7 to GPIO 16 and J2:P6 to GPIO 32 explicitly?

  • 0
    Guru 192875 points

    Hi Audrey,

    We'll be needing more info: which kit are you using? dev kit or custom board? which controller?

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Guru 13185 points

    I believe this is for Launchpad F28027 (because I was also wondering about this before).

    Best regards,

    Maria

  • 0
    Guru 192875 points

    Thanks Maria for the inputs.

    Audrey here's how you can do that using Jumper settings:

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Guru 13185 points

    Gautam,

    The problem is that there is no physical jumper in the board, so in this case should we cut the line (see the yellow box below)? And if we check the connection, GPIO16 and GPIO32 are connected both in right part and left part, so if we need to cut the line, which line that we should cut, I am wondering.

    Best regards,

    Maria

  • 0 in reply to Maria Todorova
    Guru 192875 points

    Oops! Just now checked it on my launchpad. I guess, it won't be possible unless you chop of either of lines (not recommended offcourse)!

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Guru 13185 points

    Indeed, it is not recommended.

    I am wondering why Launchpad is made like that.

    Also do you know with what software we can open the layout of this Launchpad? I tried to import it to Altium without success.

    Best regards,

    Maria

  • 0 in reply to Maria Todorova
    Guru 192875 points

    Maria, the layout supports "Mentor Graphics" Layout software.

  • 0 in reply to Gautam Iyer
    Guru 13185 points

    Hello Gautam,

    Thanks!

    However, I found out that I can open the layout using EAGLE software (cannot use PADS Layout and can not find free software in Mentor Graphics).

    The link of this software is https://www.cadsoftusa.com/download-eagle/

    I highlighted the connections of these jumpers. Seems that the white strips are the lines to be cut if we want to cut the line (maybe these are purposely marked to know where to be cut).

    So for example, Audrey needs GPIO16 and GPIO32 separately, so she need to cut line GPIO32 (second strip from left) and cut the line GPIO16 (fifth strip from left).

    This can solve the problem.

    Still I am wondering, why Launchpad is made like this :)

    Best regards,

    Maria

  • 0 in reply to Maria Todorova
    TI__Mastermind 22025 points

    Maria,

    Good question.  I did this to maintain compatibility with the BoosterPack Standard.  Originally SPI and I2c were muxed together on the MSP430 LP.  To enable the boosterpacks to be compatible I had to connect multiple GPIOs to a few pins.  I added these jumpers to allow users to separate out the functionality as they choose by cutting and jumping these pads.

    BR,

  • 0 in reply to Trey German289
    Guru 192875 points

    Thanks Trey, for the explanation.

    Maria, yup those white strips are visible through naked eyes too.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    Guru 13185 points

    Thanks a lot, Trey!
    I don't know whether this has been mentioned somewhere in the documentation or not that we can cut these lines for our purpose.

    As you can see, I and Gautam  also doubted that it was recommended (we thought that this was not recommended to cut any line).

    Best regards,

    Maria

  • 0 in reply to Maria Todorova
    TI__Mastermind 22025 points

    Maria,

    Its been mentioned a couple times on various forums, but it looks like I forgot to put this in the official documentation.  I'll get this added to the users guide.

    BR,