On Friday 26 September 2008 21:44:25 [EMAIL PROTECTED] wrote: > Hello, > > I'm trying to implement a class for an I2C device. Therefore I extended > I2CSensor. So far so good. The class offers me the sendData and getData > methods, which require a register. Why? I'm no I2C expert but if I > understand correctly this value is used to address memory!? I don't need > that, in fact I really don't want that because my device is not memory > alike and doesn't expect nor can handle this number. It expects a query > string.
What kind of device is it? The Lego I2C devices are set up as if they are memory devices. Thus, part of every transaction involves sending a register select address. To write bytes aabbccdd to register nn we send the following: Start/dev address(write)/nnaabbccdd/stop To read bytes aabbccdd from register nn we do a dummy write to set the address, then do the read: Start/dev address(write)/nn/stop Start/dev address(read)/aabbccdd/stop > > Did I understand something wrong? > The register value is added before the data bytes, right? Thus I could > divert this value to transfer my first data byte? Possibly so, it will depend on what transactions you are trying to form (eg. whether your device can tolerate restarts etc). > > Thanks and regards > Jakob ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Lejos-discussion mailing list Lejos-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lejos-discussion
