AVR-Chat

I am trying to get up and running with TWI/I2C using WinAvr under AVR
Studio, but when I go to compile sample TWI/I2C C files (from AvrFreaks,
etc) some symbolic constants, like TWEN, are missing.  I am doing this for a
ATmega644P controller and this is set in my Project Configuration in AVR
Studio. I can otherwise program the controller just fine with non-TWI code.

My installation of WinAvr has the following include folder structure:


WinAvr\avr\include
WinAvr\avr\include\avr
WinAvr\avr\include\avr\compat(*)
WinAvr\avr\include\compat(*)
WinAvr\avr\include\util(*)

There is a TWI.H file in each of the (*) folders.

If I search all the files under ...\include for TWEN, the only one that
seems somewhat relevant to the ATmega644P is a file with name IOM644PA.H
(with an "A" appended).  But the Project Configuration/Compile does not seem
to use this file.

The above folder structure is very confusing.  Why, for one thing, the
multiple TWI.H files?

Can someone please straighten me out on this?   I've been battling this for
a couple of days now and getting nowhere.

Thanks, Steve




 

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