[XCSSA] Links from Monday's XCSSA Arduino/AVR Microcontroller Programming Meeting

[X-otic Computer Systems of San Antonio]

On Thu, May 22, 2008 at 4:01 PM, X-otic Computer Systems of San Antonio <
xcssa at xcssa.org> wrote:


> Sweet!  Thanks Anton (missed you at the last meeting!  It was a hoot!).


I'll try to schedule my next trip to SA to coincide with a meeting.  It's a
bit difficult now that y'all meet over 300 miles from me ;)


>
> But now that I look at this site that you listed, I see that in one of
> their
> projects, the source code calls some support libraries that seem to load up
> said register variables:
>        (from http://nerdkits.com/videos/musicbox1/musicbox1.c)
>        [...]
>        #include <avr/io.h>
>        #include <avr/interrupt.h>
>        #include <avr/pgmspace.h>
>        [...]
>
> Do you have experience with these header files?  Are they for just ONE of
> the
> ATmel devices?  How do you "switch" between models?  Anyone?


The avr/ includes are part of the avr-libc project.
http://www.nongnu.org/avr-libc/

You switch between the AVR models with a compiler flag.  It appears to
support a whole slew of processors, including the ATTiny and others. YMMV
may vary when coaxing your code to compile into the smaller chips.
GCCFLAGS=-g -Os -Wall -mmcu=atmega168 -B /usr/avr/include

Ubuntu has version 1.4.x of avr-libc, so go hunting for the avr-libc 1.6
debs from Debian Sid.  The floating point in 1.4 is a bit lacking.  The
avr-gcc package in Ubuntu 8.04 works fine though.

For Windows users, check out WinAVR which appears to be a bundle of avr-gcc
and avr-libc for windows environs.

Look at the Makefiles in the NerdKits projects to see how everything
compiles, links, and gets loaded to the chip.  One make does it all.

--Anton
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