Reading directly from I2C ports

[tbd]

Hi Folks,

      Does anyone have a working example of how to read bytes directly from the I2C ports?  Here, Sivan Toledo says it can't be done from NXT-G environment.  He says he used "NBC" (appears to be written in assembler) but how?

Does anyone know how the NXTSystemCall.NXTCommLSRead method might be used? (I'm seeing a -32 return-code.)   Also, I experimented with sendDirectCommand.vi ("Fantom direct") but see the NXT Terminal throws an error related to CreateNXTObject (which seems to be required if using the "direct" approach.)

I only get to work on this when already tired, sorry if I've missed something obvious.

Any ideas would be appreciated!

[tbd]

... ok, instead of scanning for an example program in the "Advanced Programming" manual, I read the section on LowSpeed reads - also looked at how the Toolkit VIs talk to the UltrasonicSensor.

I'd tried just using LSRead, but the Manual says (to the effect) all I2C Port communication begins with  a Write (in a master-slave arrangement), so I write an empty buffer requesting zero-bytes back then (per the manual) check Status - which is returning "32" (busy.)  If the Status-check ever returns "0", then I'll try calling the LSRead.

Guess it's time to get-out the scope!

[Peter_B]

I'm just familiarising myself with the msgs in the LabVIEW Fans of LEGO forum and came across this unanswered post.

Perhaps this thread has the answer you were after.

regards
Peter