Re: [avr-gcc-list] ATTiny12 and gcc

[Bruce D. Lightner]

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Ulrich Schweitzer wrote:

> On Friday 26 March 2004 13:59, Eric van Rijswick wrote:
>
> > Is there no way to build C-code for the ATTiny12?
>
> There was a discussion about using avr-gcc with ATTiny-MCUs in may 2003 on 
> this list. Bruce Lightner described how to do it here:
> http://www.avr1.org/pipermail/avr-gcc-list/2003-May/004438.html
> It doesn't seem to be easy, though. 
>
> Ulrich

There seems to be a lot of interest in this based on the email I've 
received.  I've put together a distribution for Windows which I use for 
progamming ATtiny15L parts using avr-gcc.

Take a look at this 3.2 Mbyte ZIP file, which should have almost 
everything you need...

   http://www.lightner.net/avr/ATtiny.zip

See the README.txt file in the distribution's base directory and another 
README.txt file in the "projects" subdirectory.  Also read the comments at 
the beginning of the "Makefile".

This is setup for the older "gcc 2.95" so I've included a complete binary 
distribution of this for Windows.  (This also works under Linux, if you 
have the gcc 2.95 avr-gcc distribution, like I do.)

You will have to adapt the "make load" logic for your own programmer.

There is also "make" logic for "make sim" and "make wave" which uses my 
own "home grown" AVR simulator.  This C-based AVR simulator runs *faster* 
than realtime on modern PC processors (under both Linux and Windows), but 
I don't distribute it because it's writtin in ugly, blazingly fast, C-code 
with zero documentation.  It can output VCD "waveform" files for viewing 
using WinWave, an amazing bit of open-source software...

http://www.geocities.com/SiliconValley/Campus/3216/GTKWave/gtkwave-win32.html

Please read the comments in the "Makefile" regarding the ATtiny "OSCCAL" 
oscillator calibration byte.  My custom-made AVR PC parallel port 
programmer reads and inserts this value into program memory such that the 
ATtiny part can automatically calibrate itself after reset.  This makes 
"bit banged" UARTs work perfectly.

I'm happy to answer questions, but be warned, this stuff is *not* for 
"newbies".  Much of this is based on knowing AVR assembly code very well, 
and knowing exactly how "avr-gcc" converts C into AVR machine code.

Best regards,

Bruce

--
 Bruce D. Lightner
 Lightner Engineering
 La Jolla, California
 Voice: +1-858-551-4011
 FAX: +1-858-551-0777
 Email: address@hidden
 URL: http://www.lightner.net/lightner/bruce/


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