Re: [hpoj-devel] patch to improve scan speed/robustness

[Joe P. <joe...@sn...>]

On Mon, 30 Oct 2000, David Paschal wrote:

<...>
> The 570 I have perpetually scrolls the message "See instructions to print
> demo page" or something like that, except when it has a more urgent message
> to display.  If I remember correctly, when I ran the original xojpanel
> (which presumably didn't scroll text by itself) with this peripheral, the
> message scrolled on the screen at more or less the same rate.

The original xojpanel has no ability itself to scroll. If its text display
"scrolls"  it would be because the printer is sending partial strings. If that
is the case, my code should handle it anyway, as long as no timing problems
develop. If the string is more than 16 chars, the pixmap will probably just be
overrun with text. It may not cause any damage, but won't look nice. A longer
lcd background pixmap would need to be substituted in a case like that, with
some code changes. It might not be too difficult.

Can you check the xojpanel output again to see what's really happening, and
how long the string is, if you can see it all? The last release of xojpanel
has a problem finding its lcd pixmap, but if run from the xojpanel/ build
directory, it shouldn't have any trouble.

If you can get "hpo set" working, can you get it to automatically set the
Time/Date on the printer? The 600's clock has to be reset every time the
printer is turned on.

The memory leak I found is plugged now in my upgraded xojpanel. The new code is
on my site. I did a kind of test of Line2 scrolling by creating a fake
Line2 string. It seems ok. It still needs a real test, though.

http://pages.cthome.net/jsp/hpoj-linux-gui/index.html

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Joe