Andrew,
I am very interested in your approach, code etc etc,
although I will probably use a PIC for the raster
handling since I already have a PIC controlling the 3
axes and the spark control. I never thought of the
TIFF format. Please post anything you develop, all
will be gratefully received.
Roger
--- Andrew <
andrewm1973@...> wrote:
> Andrewm with the goat blood on his hands wrote:
> <Snip marraige proposals>
> I am dumping the BMP file to a seperate Micro.
> <Snip>
> The idea is to have the ATMEL sit on a seriel port,
> then you run some terminal software on the PC and
> xmodem transfer the file to it.
> <Snip>
> I was going to use TIFF file format with G3 fax
> compression instead of BMP. On most PCB files you
will
> get about a 10:1 compression ratio with G3.
> <snip>
> Worst case senario and I can't get an atmel to
decode
> G3 fax - I will hang my head in shame, do my own
> RLE compression in software on the PC side and admit
> to the world in general that pop-up-toasters do in
> fact need 1 gighertz embeded Power-PCs.
I am surprised no one quiped that a 1 Ghz CPU in a
toaster could be the heating element.
ANYWAYS - point of the post.
Mr Roger Lucas,
I have finished reading the TIFF specifications
carefully and also looked at some TIFF/G3 files in
a hex editor. It is very doable from a seriel
stream as long as the saving application does not
put the segments of the picture out of order.
Most of the apps I have looked at so far have saved
the TIFF in a suitable format.
I will over the next few weeks cut-paste/write
atmel code to:
- Act as a terminal
- Accept an X-Modem-CRC/128 file transfer
- Decode the TIFF header info and report if the
file is suitable
- Decompress the RLE/Huffman data into a stream
of black and white pixels
If your EDM hardware uses an ATMEL you are more
than welcome to the code. Even if you use another
micro you might like to look at the flow/logic/
pseudo/comments to see if you want to convert the
thing to run on your micro.
Be sure to visit the group home and check for new
Links, Files, and Photos:
http://groups.yahoo.com/group/Homebrew_PCBsIf Files or Photos are running short of space, post
them here:
http://groups.yahoo.com/group/Homebrew_PCBs_Archives/ SPONSORED LINKS
Electrical engineering degree online
Electrical engineering degree
Printed circuit board
Electrical engineering
Electrical engineering course
Electrical engineering graduate school
---------------------------------
YAHOO! GROUPS LINKS
Visit your group "Homebrew_PCBs" on the web.
To unsubscribe from this group, send an email to:
Homebrew_PCBs-unsubscribe@yahoogroups.com Your use of Yahoo! Groups is subject to the Yahoo!
Terms of Service.
---------------------------------
___________________________________________________________
Switch an email account to Yahoo! Mail, you could win FIFA World Cup tickets.
http://uk.mail.yahoo.com