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Christian Mock wrote:
> In lugnet.robotics.nxt, <dickswan@sbcglobal.net> wrote:
> > This is the excepted behavior. When you want to read from I2C device,
> > the NXT firmware first sends a write message to load the internal index
> > "pointer" for the I2C device and then sends a read message that will
> > read the requested number of bytes. Usually I2C device auto-increment
> > the internal index pointer whenever a message is r/w multiple bytes.
>
> Hi Dick,
> your answer solves my knot :D
> It's a NXT specific behaviour and all alternatives NXT-OSes which uses original
> Lego-Source-Lowlevel routines have this feature ?
Let me say thanks to Dick as well. I think that the NXT firmware does
what's called a repeat start in the I2C definition...
Here's the part in the I2C spec that is required:
<http://www.i2c-bus.org/RepeatedStartCondition/>
And with pictures:
<http://www.best-microcontroller-projects.com/i2c-tutorial.html>
Hope this helps...
Ralph
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