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LP8758-E0: I2C for GUI Software

Barry Grquinovic
Prodigy 80 points
Part Number: LP8758-E0
Other Parts Discussed in Thread: LP8758, , IPG-UI, USB2ANY

Question regarding the I2C interface.  Is it possible to use any USB to I2C adapter to interface to the LP8758 from the TI supplied GUI interface?  Or does TI recommend a specific adapter?

Barry

  • 0
    TI__Genius 17380 points

    Hi Barry,

    The TI supplied EVM GUI interface only works with the Atmel AT91SAM which is present on the EVM. If you want to use the EVM GUI to talk to a part that is not on the EVM, you would have to disconnect the LP8758-E0 on the EVM from the Atmel (remove R10 and R11) and use TP5 and TP6 to connect to the target board. 

    I2C communication without the EVM GUI is also possible in a couple of other ways with simple bit-banging (reading / writing to single registers without the GUI).

    The first is to use a USB2ANY adaptor with the IPG-UI. The IPG-UI has a "Blank-I2C-7bit-1.0" project that can be used for single register read / write. Alternatively, there are a number of TI EVMs that ship with a "USB2ANY" adaptor like TPS650830EVM. If you happen to have one of those already then you wouldn't need to update a Launchpad.

    The other option would be to use a 3rd party supplier like Aardvark for the bit banging.

  • 0 in reply to Kevin LaRosa
    Prodigy 80 points
    So you have no other way to change the GUI software to work with an off the shelf USB to I2C adapter from FTDI?
  • 0 in reply to Barry Grquinovic
    TI__Genius 17380 points
    Hi Barry,

    Correct, the EVM GUI was only designed with driver support for the AT91SAM.