Connect with us

I2C, lack of Windows information

Discussion in 'General Electronics' started by [email protected], Mar 24, 2005.

Scroll to continue with content
  1. Guest

    I am trying to interface an on-motherboard Nvidia NForce2 I2C driver to
    a Cygnal processor via the SMBus.

    Now, normally I would do this all Linux, and it would be trivial, but
    my development environment is Windows for the Cygnal (now SiLabs).
    Don't go off trying to tell me to change my IDE. There are other
    issues.

    My problem is that I can't find any documentation at all on accessing
    the SMBUS that's built into the motherboard. There's lots of
    information on using adapters, and there's some MSDN stuff from
    Microsoft on the SMBus, but it's not clear at all how I access it.

    The SMBus is working. I've installed some temperature monitoring
    software, and my oscilloscope shows activity. I've got all the wires,
    just questions on where the #@$%&#(*%$ API is to talk to it.

    After reading this, I want to make it clear that I'm not having
    problems on the 8051 processor side. This is a Windows question.
     
  2. For premade tools, try here:

    http://www.i2ctools.com/index.html

    Chances are, the temperature sensors on the mainboard are I2C. Thus, if
    you can figure out how they get read, you can figure out how to read
    your device.

    Try calling or emailing the mainboard mfgr.

    --
    Regards,
    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
     
  3. prem

    prem Guest

    hi do u aware of i2c? i am working with PCF8583. with microcontroller
    AT89S51. can u help me? if so can u send any routine useful to me?
     
  4. You can find lots of information on the web. Microchip has various
    apnotes with sample code. There are sites dedicated to it, like some
    wierd cult.

    --
    Regards,
    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
     
  5. Unless the MS Windows SMBus drivers have control of the bus and don't
    provide users with the tools to add new device drivers.
     
  6. One good way to figure this stuff out would be to examine the I2C
    package from the linux sources. Then, a device driver written for
    windows might be able to play games and take over the hardware. This is
    a guess.

    --
    Regards,
    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
     
  7. Hey! This whole NG is a wired cult!
     
  8. Maybe. But I'm wondering if Windows has an acessible API that one can
    use to register a driver for a new device added to their bus. Since
    modifying motherboards isn't sometthing th typical user does with their
    PC, they might not have given users access (API documentation, header
    files, etc.) to their bus drivers.
     
  9. That would be nice.

    There are third party programs (Sandra from SISoft) that read the
    motherboard temps. There are also utilities from the mobo mfgr that do
    this. Thus, it is *possible*. Who knows how easy it is?..

    'Sandra' installs their own services, and who knows what else, to do
    this kind of thing.

    There are microsoft API calls for reading various environmental
    parameters, but they generally don't work. (I spent a few hours
    researching this at one point a few months ago.)

    --
    Regards,
    Robert Monsen

    "Your Highness, I have no need of this hypothesis."
    - Pierre Laplace (1749-1827), to Napoleon,
    on why his works on celestial mechanics make no mention of God.
     
  10. Andy P

    Andy P Guest

    If youve got the visual studio suite, install the extra tools. In it
    there are service and API spy programs. If you run them, then run
    whatever it is that accesses the temp stuff, you may be able to
    itnercept the calls that are made, and hook them in your own program. I
    dont know if it will work with non-microsoft things, as I've never
    tried, but it's worth a shot.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-