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TPS26750: 4CC "GPPI" example

Eli Brantingham
Prodigy 70 points
Part Number: TPS26750

Tool/software:

I'm using the TPS26750 and cannot seem to figure out the GPPI 4CC command.  I've have successfully used other 4CC commands that don't require InputX data, but cannot figure out the GPPI command.  I've attached an4CC GetStatus Attempt.zip I2C capture of my attempt, but I always get a "!CMD" response.  For the capture I tried to follow the example in Fig 5.1 on page 72 of the TRM.

Also, I was wondering how to force the TPS26750 to send a Hard Reset over the I2C commands?  Thanks  

  • 0
    TI__Mastermind 18225 points

    Hi Eli,

    Thanks for reaching out on E2E!

    For GPPI give me some time to take a look at the I2C. Do you also have a PD log of this case of when you send the command to the port partner?

    For hard reset, we do not have a specific command to force a hard reset, but you could write to the port configuration register which will cause a disconnect equivalent to a hard reset.

    You don't need to write new settings just rewriting what's already in your config should be enough. Also you could use the GAID command but if you don't have an eeprom in your system you would have to reload the config over I2C.

    Thank you,

    Kevin

  • 0 in reply to Kevin Kosta
    Prodigy 70 points

    Kevin, 

    Thanks for the quick reply, double checking my work, I flipped the order of GPPI and instead wrote IPPG to the register.  Fixing that made the Get_Status message go through successfully.  Writing to the Port Configuration Register does cause a disconnection, so thanks for that as well.  Thanks again and sorry my dumb mistake.

    -Eli