Hey Chris,

Yeah, I had heard about the PSP screen, I just thought it would be a while, and I am the kind of guy that needs to get started when the idea hits me...

I have already thought about getting the verdex and console, I am just unsure of what to do with it.  Is there a collection of gumstix projects with some details somewhere?  Just can't really think about something to do with the board and without a screen to "see" Linux...

Thanks,

On 5/13/07, Chris Dollar <chris.dollar@gmail.com> wrote:
Hi Fabio,

> I assume you are using the GPSStix?
Yep.

> How happy with it are you?
Very happy... I've not been around a lot of gps units, but I'm really
impressed with the performance of the ublox on the gpsstix.

>I read the
> research papers the Austrian company wrote on how well it works in closed
> environments.  My use is not in a closed environment, but that's still nice
> to know.
I've not had mine in a car yet, but here at home with an active
antenna and 9' cable inside an east facing window its not unusual for
me to have a lock on 10 satellites.  The first fix takes a while, but
once you have that I've found it hard to lose the fix in my house.

>
> The GPS in my car seems to update very fast, around 3-4 times per second.  I
> don't know if they are just interpolating the last heading/speed, or if it
> is actually updating position that quickly.  Do you know how often the
> GPSStix updates its position?
No, although if you follow the links in the wiki and nab the ublox
datasheet I'm sure you can find that info there.

>
> So a framebuffer driver needs to be added to the gumstix kernel?  Sorry, I
> don't quite understand that part.
If you get an ALPS display like mine its a simple matter of selecting
an option in the kernel config menu.  For other lcds you would need to
know its timing info (found in the datasheet) so you can pass the
right options to the framebuffer driver as boot-time parameters.  If
you search the archives you can find lots of examples of framebuffer
driver params for various lcds that have been connected to gumsitxes
in the past.

>
> I am ready to buy, but I am holding back, affraid I will not be able to
> handle the hardware once it arrives, to be honest.  Hard to admit that, but
> it's true.
Gumstix is planning a GSMStix board that will include all the features
on the current GPSStix (with some upgrades) as well as GSM support,
all on a pcb designed to connect to a sony PSP lcd.  If in doubt about
the hardware, I'd just get a verdex motherboard and console-vx board
so you can start getting familiar with linux and gumstix, and then get
the GSMStix and PSP combo once it becomes available - then you don't
have to worry about the hardware and by then the framebuffer stuff
will most likely just be a menu option for the kernel.
>
> Thanks again, nice to get help!

No problem!

Chris
>
>
> On 5/13/07, Chris Dollar < chris.dollar@gmail.com> wrote:
> >
> > Hi Fabio,
> >
> > On 5/13/07, Fabio Miguez <fabiomiguez@gmail.com > wrote:
> > > Hey Chris,
> > >
> > > The only thing I found at HSC was this
> > >
> http://www.halted.com/commerce/ccp21599-lcd-display-320x240-3224-h3130-80815.htm
> > > but there are no specs, even though it seems to be a 320x240 LCD.
> > >
> > I'd stay away from anything you can't get a datasheet for..
> >
> > > I looked on ebay but did not find any of them.  There were other ALPS
> > > screens and inverters, but nothing similar to this.  Is ALPS the brand?
> > >
> > Yes, the brand is ALPS.
> > > I am a complete newbie on Linux, embedded computers, and electronics in
> > > general, including LCDs, although I have lots of experience in Windows,
> C++,
> > > and C#, but as of late I have been struggling to understand how to use a
> > > screen with gumstix.
> > >
> > > From what I have understood, the PXA270 has an LCD controller with a
> frame
> > > buffer available, so I could even use OpenGL in software acceleration
> mode,
> > > and I think I need an LCD screen and its inverter before I can connect
> to an
> > > Audiostix or GPSStix, but that connection is a mystery to me, I don't
> know
> > > if it is as simple as hooking up the wires, or whatever else.
> > >
> > Actually, it is almost as simple as hooking up the wires.  You'll have
> > 8-16 lcd data lines to connect, and a few clock lines and others like
> > a gpio for turning the display on/off.  The only other thing is
> > setting up the framebuffer driver with the right settings for your lcd
> > (which is why you really need a datasheet, or at least the settings
> > from someone else who has that particular lcd model working).
> > > What is your application for gumstix?
> > >
> > Basically its a graphical gps program.  It hooks into gpsd and every
> > time an update comes from the gps a map is generated (from an open
> > source program called tmrs) and displayed with some other position
> > information.  Thats why refresh rate isn't much of a concern.
> > > Thanks,
> > >
> > Sure thing,
> >
> > Chris
> > >
> > > On 5/13/07, Chris Dollar <chris.dollar@gmail.com > wrote:
> > > >
> > > > Hi Fabio,
> > > >
> > > > I bought 2 of those displays from HSC Electronics ( halted.com) about
> 2
> > > > years ago.  I don't think they carry them anymore, but I have seen
> > > > them recently on ebay going for ~$10US.  I've had really good success
> > > > with the display, but I don't really know how good the refresh rate is
> > > > - with my project I'm only redrawing to the framebuffer 2-4 times per
> > > > second, which it handles really well.
> > > >
> > > > All-in-all I think its a pretty nice display.
> > > >
> > > > Chris
> > > >
> > > >
> > > > On 5/13/07, Fabio Miguez < fabiomiguez@gmail.com> wrote:
> > > > > Hi Chris,
> > > > >
> > > > > I was wondering where you got this screen, I have been searching for
> > > some
> > > > > time now (about 2 hours) via Google, Earth LCD, and have not find
> > > anything.
> > > > > Am I just not looking in the right place, or they are really hard to
> > > find?
> > > > >
> > > > > Also, how happy are you with that screen?  Is the refresh rate
> decent?
> > > > >
> > > > > Thanks,
> > > > >
> > > > >
> > > > > On 5/12/07, Chris Dollar < chris.dollar@gmail.com> wrote:
> > > > > > I'm using the ALPS LFH8P4032B which includes an integrated 4wire
> > > > > > resistive touch screen (datasheet here
> > > > > >
> > > > >
> > >
> http://hubbard.engr.scu.edu/embedded/lcd/lfh8p4032b/lfh8p4032b.html
> > > > > ).
> > > > > >
> > > > > > Here are the connections:
> > > > > > ALPS --- Audiostix2
> > > > > > Y-Up  --- Y+
> > > > > > X-Lft   --- X+
> > > > > > Y-Dn  --- Y-
> > > > > > X-Rt   --- X-
> > > > > >
> > > > > > You should check out the UCB1400 datasheet for more info on its
> > > > > > touchscreen controller, but afaik it only works with 4wire
> resistive
> > > > > > type touchscreens.
> > > > > >
> > > > > > Chris
> > > > > >
> > > > > > On 5/11/07, Jayesh Salvi < jayeshsalvi@gmail.com> wrote:
> > > > > > > That would be helpful too. Somewhere I read the advise to use
> 4-wire
> > > > > > > resistive touch screens with UCB1400. Does it not support other
> > > forms of
> > > > > > > touch screens (5-wire resistive or transmitive/capacitive for
> that
> > > > > matter)?
> > > > > > >
> > > > > > > Jayesh
> > > > > > >
> > > > > > >
> > > > > > > On 5/11/07, Jeff Sadowski < jeff.sadowski@gmail.com> wrote:
> > > > > > > > this is all the software side could you give the model of
> > > touchscreen
> > > > > > > > and wireing reference also? thanks :-)
> > > > > > > >
> > > > > > > > On 5/11/07, Jayesh Salvi < jayeshsalvi@gmail.com> wrote:
> > > > > > > > > Thanks Chris! Useful info.
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On 5/10/07, Chris Dollar < chris.dollar@gmail.com > wrote:
> > > > > > > > > > Just got the touchscreen working with my lcd on the
> regular
> > > > > > > > > > basix/connex buildroot.  I put together this wiki page
> > > detailing
> > > > > how
> > > > > > > > > > to do it at
> > > > > http://docwiki.gumstix.org/Touchscreen
> > > > > > > > > >
> > > > > > > > > > There is a patch that has to be applied to the kernel (and
> one
> > > > > that
> > > > > > > > > > has to be removed), but it only applies to the 2.6.20
> kernel
> > > as it
> > > > > is
> > > > > > > > > > fixed in 21.  Other than that the build is pretty easy.
> The
> > > part
> > > > > that
> > > > > > > > > > got me was the ucb1400 interrupt back to the pxa - no
> matter
> > > what
> > > > > I
> > > > > > > > > > would do the pxa wouldn't get the interrupt and the
> > > touchscreen
> > > > > driver
> > > > > > > > > > would hang.  As is turns out, the IRQOUT pin on the
> ucb1400 is
> > > > > > > > > > connected to PWM0, aka GPIO 16, on the gumstix, which I
> was
> > > using
> > > > > to
> > > > > > > > > > set my lcd contrast.  Moving the lcd contrast to PWM1 to
> allow
> > > > > PWM0 to
> > > > > > > > > > function as the ucb1400 input pin got it all working.
> Moral
> > > of
> > > > > the
> > > > > > > > > > story is: if you are using PWM0 for something else, the
> > > > > touchscreen
> > > > > > > > > > driver won't work.
> > > > > > > > > >
> > > > > > > > > > Chris
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> > > > > > >
> > > > >
> > >
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> > > > >
> > > > > --
> > > > > Fabio Miguez
> > > > >
> > >
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