At 06:48 PM 9/3/2008, you wrote:
Arius - Rick Collins wrote:
> At 01:02 PM 9/3/2008, you wrote:
>> Notice that they specify 0 degrees as pin one in the SW quadrant.
>> Although they don't say which direction the rotation is, looking at an
>> illustration, it seems to show that the rotation is CCW. I want to
>> say I read this somewhere else, but I can't say where. It is not easy
>> to find this info on the web.
>
> I did some more searching and found another document on XYRS formats. I
> should have stopped at one, because now I have two that conflict...
The one "officially" supported by gerbv is the one generated by pcb.
The format of that one is documented in the pcb manual which can be
found at the pcb web site pcb.sf.net
There appears to be no standard but since the files are typically ascii
I think it is largely up to users to convert to the pcb format if they
want to view them in gerbv.
Yes, I found that doc. It tells you that the file is comma separated
ascii and the column order. But the data interpretion does not match
the examples. Looking at the LED example, pin 1 in the lower left
corner for 0 degree rotation (U5) and CW rotations are positive. The
one constant factor in the sources I have found is that rotations are
always CCW. The manual says that pin #1 being in the upper left
quadrant is 0 degree rotation and the direction of rotation is
CCW! Finally, all of the markers added from the XYRS file are 180
degrees out from the silkscreen. What's going on with that? Is
there something wrong with the example file I used?
I think I may not need Gerbv to view my XYRS files. I found a
program called SMT-Maestro that not only lets you verify your XYRS
file, you can combine it with the BOM and verify that they
match. Not bad at all. However, it may be free, but it is not open
source. I would really like something that I can add to so that it
will not just put little boxes on the screen, but rather show me the
components as they will be placed on the Gerber plots.
I will say that a viewer requiring files to be in an unique format
when there is ***NO*** spec is not a good idea. Then the viewer
becomes a special purpose tool it becomes part of the problem rather
than part of the solution. SMT-Maestro does it in a flexible manner
that allows the user to specify what data is in what columns and what
the field separator is. IMHO, by requiring the user to manually
change the file formats, errors can be introduced which defeats the
reason for using the viewer in the first place, to catch errors!
To see how XYRS and BOM imports should be done, check out SMT-Maestro.
Rick
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