[hpoj-devel] preliminary PML/scanning support

[PASCHAL,DAVID (HP-Roseville,ex1) <dav...@hp...>]

Hi,

I just checked in some more code changes, mostly regarding adding PML
support to libptal.  It works pretty well over parallel and USB, but there's
still some more development and cleaning up to do, including adding
JetDirect support.  Do a "cvs update" to pick up the new changes, then
re-run the configure script, make, and make install.

Of particular interest is the new "ptal-hp" command-line application, which
has various options for device status/control, including setting the device
clock, reading the LCD contents (like xojpanel), and PML scanning.  At the
moment, scanning only works on the LaserJet 1100A/1220/3200, and I'm still
trying to get it working on the OfficeJets, but I figured I might as well
check in what I have right now and keep working on it.  One intention behind
ptal-hp is to serve as a prototype and testbed for future development on
xojpanel, xhpcontrol (a replacement for xojpanel), and a unified SANE
backend for the supportable OfficeJets and LaserJets.

I added to the INSTALL file a little bit of getting-started information
about ptal-hp, but later I need to go back and overhaul the documentation,
since it's gotten rather disorganized during my recent coding frenzies.  :-)

Joe, thanks for your xojpanel patch.  Shall I check it into CVS to serve as
a baseline for further development?  I haven't yet gotten around to
documenting the new PTAL API, but if you'd like to go ahead and take a stab
at switching xojpanel over to PTAL, you can use apps/cmdline/ptal-hp.c as an
example.  Here's a quick outline of what you'll need to do:

#include "ptal.h"

...

main() or constructor {

// startup code:
ptalInit();

char *deviceName=device name (i.e. mlc:usb:0) from command line;

ptalDevice_t dev=ptalDeviceOpen(deviceName);
ptalPmlOpen(dev);

...

// shutdown code, which ptal-hp currently lacks:

ptalPmlClose(dev);
ptalDeviceClose(dev);
}

Also look at handleDisplay() and printOneLine.  Note that I added a second
pair of OIDs which works for the LaserJet 1220 and 3200, which would also be
nice to add to xojpanel.

Currently I hard-coded the object IDs (OIDs) and structures and constants,
such as "\x1\x2\x2\x1\x....".  Eventually I'll move this to a common header
file(s), but for now you can just hard-code the OIDs the way I did in
handleDisplay().

David