[chbot] AVR external interrupt and Makefile example-->git

[Charles Manning]

For a better overview than what I give here, google for git vs bzr or similar. 
Like cvs vs svn, many of the ideas intersect between bzr and git, so learning 
git helps set you up for bzr too, or vice versea.

The weird thing for newcomers to both git and bzr is the idea of there being 
no central repository, except by convention. Technically each clone (ie. 
checkout in cvs/svn-think) is a full repository that others can pull/push 
from/to if they have access. My Linux git repository is no different to 
Linus' except than more people listen to him than me :-). This is really 
where both the power and headaches come from.

If you just use the basic features of git as a single developer, or as a small 
group of developers, then it really is little different to using any other 
source control. The github tuts are at http://learn.github.com/ git is faster 
and handles branches better than svn/cvs. The biggest win is that you can 
commit/rollback changes without involving the main repository.

If you just want to use git like cvs/svn then just pull/push to github. See 
http://learn.github.com/p/normal.html. That will probably cover 99% of your 
home use.

Visual tools like 'git gui' and gitk help too.

-- Charles



On Thursday 12 November 2009 11:09:43 Richard Jones wrote:
> Thanks Charles,
>
> Nice suggestion, very gratefully received as I was unaware of github.
> Is there something similar for bazaar or should I learn git? I've not used
> bazaar yet either, but it is on my todo list and I think more compatible
> with my cvs/svn background.
> I Like the straight forward makefile in bump and turn, readable by mortals
> like myself!
> So for the next step in avr Makefiles I suggest folks have a look at yours
> rather than adapt my simplified one.
> http://github.com/cdhmanning/avrprojects/blob/master/bumpandturn/Makefile
>
> Cheers
>
> Richard
>
> On Thu, 12 Nov 2009 08:36:52 +1300, Charles Manning
>
> <manningc2 at actrix.gen.nz> wrote:
> > Hello Richard
> >
> > May I be so forward as to suggest you get a github account.
> >
> > github provides source control and download in a really easy manner (and
> > you
> > get to learn a bit about git if you want). It is easier to use than
> > sourceforge, IMHO.
> >
> > Free for open source use.
> > Mine is at: http://github.com/cdhmanning
> >
> > If you do a lot of command line work under Windows, then it is really
>
> worth
>
> > getting cygwin. This provides almost the full Unix-like environment under
> >
> > Windows.ie. make, grep, scripts etc. Google will find it.
> >
> > -- CHarles
> >
> > On Wednesday 11 November 2009 23:30:11 Richard Jones wrote:
> >> AVR external interrupt and Makefile example
> >>
> >> At the Chch Creative Space session last week there were some questions
> >> about how to code the external interrupt and Makefiles for the AVR.
> >>
> >> I've collected together some code fragments from my micromouse and
>
> placed
>
> >> them in a single 'c' demo file. A simple Makefile collects together the
> >> commands to compile the code, generate a hex file and program the device
> >> using a serial bootloader. The Arduino makefiles are a fine example of
> >> how
> >> to obfuscate the process beyond belief. My makefile is a little too
> >> simple
> >> and would benefit from a few variables like target and cpu_frequency. If
> >> you are interested have a look at the code and feel free to ask
>
> questions
>
> >> or propose improvements. Although the code does execute, printing out
>
> the
>
> >> external interrupt count about once per second, I noted 11 improvement
> >> opportunities and one bug.
> >>
> >> At the command line type 'make' to build the code, 'make program' to
> >> program the avr chip, and 'make clean' to delete all the temporary
>
> files.
>
> >> If you want to see what commands the make utility would issue without
> >> actually executing commands type 'make -n program' at the command line.
> >>
> >> I compile the code using gcc on ubuntu, but it probably works just as
> >> well
> >> with gcc under windows or OS X.
> >>
> >> Richard
> >
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