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by jcg
Sat Sep 08, 2012 4:02 am
Forum: Staffroom, classroom and projects
Topic: Maths App worth a look
Replies: 2
Views: 1470

Re: Maths App worth a look

danh wrote: it accepts python scripts
That is a bit of an understatement. In fact, much of the application is constructed in python, you talk to it in python, and it is extensible in python. If someone has a binary built for the R-Pi that would be AWESOME.
by jcg
Sun Jul 29, 2012 2:22 am
Forum: OpenGLES
Topic: GPGPU
Replies: 3
Views: 3625

Re: GPGPU

by jcg
Sat Jul 28, 2012 11:53 pm
Forum: OpenGLES
Topic: GPGPU
Replies: 3
Views: 3625

Re: GPGPU

The OpenGL ES 2.0 implementation on the Pi doesn't support floating point textures . It doesn't really matter though, even with FP textures available, GLES 2.0 is still a lousy API for GPGPU applications. Thanks for the thread link. This post has me wondering a few things: 1.1 and 2.0 are supported...
by jcg
Sat Jul 28, 2012 9:22 pm
Forum: OpenGLES
Topic: GPGPU
Replies: 3
Views: 3625

GPGPU

There has been some discussion of GPGPU elsewhere on the forum, but not so much in this section where it belongs, so I've started this thread to try to get something going here. Basically, it makes sense to learn how to use OpenGL ES 2.0 to do GPGPU stuff. The reasons are not only that the R-Pi has ...
by jcg
Tue Jul 24, 2012 9:11 pm
Forum: OpenGLES
Topic: Finally Stumbled in Here ... and Glad of It!
Replies: 1
Views: 1653

Re: Finally Stumbled in Here ... and Glad of It!

I have just read that floating point textures are not supported in GLES2, but that OES_texture_float exists ( http://www.khronos.org/registry/gles/extensions/OES/OES_texture_float.txt ) Is this extension supported on R-Pi GPU or are you planning on doing something else for floating point textures (i...
by jcg
Fri Jul 20, 2012 10:47 pm
Forum: Networking and servers
Topic: Networking with Kindle over USB
Replies: 4
Views: 4426

Re: Networking with Kindle over USB

I'm really beginning to think a more web-based approach is the way to go for a lot of it. With a JVM web server on each device, you could just use something like this: http://ajaxian.com/archives/webtty-server-terminal-on-webpage-using-ajax Furthermore, you could use each JVM server as a cluster nod...
by jcg
Fri Jul 20, 2012 10:33 pm
Forum: Other programming languages
Topic: Racket
Replies: 5
Views: 4233

Re: Racket

"Pretty neat" is placid compared to my reaction. The way the authors described how broken the derivative is in Euler-Lagrange (and the reference to Spivak) completely blew my mind. And it only gets better from there :D. Thanks so much for the guile scmutils pointer, I'll check it out. EDIT: For the ...
by jcg
Fri Jul 20, 2012 2:56 am
Forum: Other programming languages
Topic: Racket
Replies: 5
Views: 4233

Re: Racket

Wonderful! Unfortunately no mit-scheme yet I imagine... scmutils is really the killer-app.
by jcg
Thu Jul 19, 2012 6:55 pm
Forum: Other programming languages
Topic: Racket
Replies: 5
Views: 4233

Racket

Does anyone have drracket working on the R-Pi? Racket is the latest incarnation of the PLT Scheme language. There are some really exceptional learning materials available and the drracket environment is great for getting new programmers interested. It has lots of cool features like easily accessible...
by jcg
Thu Jul 19, 2012 6:08 am
Forum: Off topic discussion
Topic: What are your Other Hobbies / Interests??
Replies: 72
Views: 11118

Re: What are your Other Hobbies / Interests??

Wow lots of pilots and amateur machinists! Very cool. I have a South Bend 13" with quick change gearbox and power everything and a South Bend 9" with slow change gears and power nothing (except leadscrew, of course)... unfortunately both gathering dust in my mom's garage while I'm in college. I also...
by jcg
Thu Jul 19, 2012 5:48 am
Forum: Networking and servers
Topic: Networking with Kindle over USB
Replies: 4
Views: 4426

Re: Networking with Kindle over USB

Ok, someone yell at me if continuously bumping this thread is annoying. There isn't much traffic here, the `edit post' feature seems to be `broken', and I just found some more cool Kindle-related stuff. Specifically, some info about the display framebuffer, and other things. https://github.com/dpavl...
by jcg
Thu Jul 19, 2012 2:24 am
Forum: Other projects
Topic: Touchscreens for Raspberry Pi
Replies: 105
Views: 179053

Re: Touchscreens for Raspberry Pi

Not to beat a dead horse, but the Kindle Touch has one...
by jcg
Thu Jul 19, 2012 1:25 am
Forum: Beginners
Topic: Best File System for Flash
Replies: 7
Views: 5784

Re: Best File System for Flash

Do you have no gui? If you do, gparted is the easiest way. Otherwise, you will need to use something like cfdisk and then mkfs. Read the manuals for those tools before you use them!

Code: Select all

$ man parted
$ man cfdisk
$ man mkfs
by jcg
Thu Jul 19, 2012 1:10 am
Forum: Off topic discussion
Topic: Which Oscilloscope?
Replies: 41
Views: 12995

Re: Which Oscilloscope?

@mahjongg: I've used some pretty nice Tectronix digital storage scopes too, but they are $$$. However, usually you get what you pay for. @OP: It might be a good plan to look for an older used name-brand digital storage oscilloscope like HP or Tectronix. As long as you get it from a reputable place a...
by jcg
Wed Jul 18, 2012 11:25 pm
Forum: Off topic discussion
Topic: Which Oscilloscope?
Replies: 41
Views: 12995

Re: Which Oscilloscope?

ksangeelee wrote:I opted for a DSO-2090 oscilloscope and a Saleae Logic analyser, and have been impressed with both (in other words, I haven't outgrown them!).
Do you use them with Linux? If so, what software works?
by jcg
Wed Jul 18, 2012 11:05 pm
Forum: General programming discussion
Topic: Why not program on x86 desktop?
Replies: 60
Views: 13020

Re: Why not program on x86 desktop?

Sorry I have to disagree with some of the above, with a laptop or even a tablet you are truly portable with an independent (but time limited) power supply and depending on location can access a wireless or 3G connection. If you are out of the house with the pi you need power, a borrowed screen, key...
by jcg
Wed Jul 18, 2012 10:47 pm
Forum: Networking and servers
Topic: Networking with Kindle over USB
Replies: 4
Views: 4426

Re: Networking with Kindle over USB

Apologies for the bump, but I couldn't edit my previous post. This is just a URL dump of Kindle-related resources. The first ~8 minutes of this video (Jesse Vincent's Kindle 2 summary): http://blip.tv/file/2391051 , igorsk's blog with lots of Kindle 2 stuff: http://igorsk.blogspot.com/ , hacks for K...
by jcg
Wed Jul 18, 2012 8:02 pm
Forum: Off topic discussion
Topic: Which Oscilloscope?
Replies: 41
Views: 12995

Re: Which Oscilloscope?

While I don't have an answer, I would also like to hear opinions. On a side note, apparently you can use a sound card as an oscilloscope: http://blog.makezine.com/2007/11/24/turn-your-soundcard-into-an-os/ . Also, given that the R-Pi has no sound card, it may be difficult to turn it into an oscillos...
by jcg
Tue Jul 17, 2012 11:35 pm
Forum: General programming discussion
Topic: Why not program on x86 desktop?
Replies: 60
Views: 13020

Re: Why not program on x86 desktop?

You can pick up a cheap second hand PC for not much more than a RPi on ebay so cost although important is a secondary issue. R-Pi: $35 PSU: $20? KBD: $5 Total: $60-70. You won't find a machine (it's got to be a laptop to compete in the portability category) with the general-purpose usability of thi...
by jcg
Tue Jul 17, 2012 10:03 pm
Forum: Networking and servers
Topic: Networking with Kindle over USB
Replies: 4
Views: 4426

Networking with Kindle over USB

Hello, This project could bear a title like "all your Kindle are belong to R-Pi." I have a Kindle 3 on which I am root. See this guide: http://www.turnkeylinux.org/blog/kindle-root . I would like to do four things: (1) I would like to harness the Kindle's display for use by the R-Pi, (2) I would lik...
by jcg
Tue Jul 17, 2012 6:38 am
Forum: Other projects
Topic: Analog Camcorder Viewfinder
Replies: 1
Views: 1141

Re: Analog Camcorder Viewfinder

With an IR flashlight and a CCD with filter removed hooked up to your R-Pi you could have a night vision monocle.
by jcg
Tue Jul 17, 2012 3:12 am
Forum: General discussion
Topic: Java on the Pi!
Replies: 19
Views: 2423

Re: Java on the Pi!

In a discussion I had with an Oracle engineer at the Maker Faire near San Francisco in May, Oracle is working on a full-up JavaFX release for the Pi and will be fully supporting the Pi going forward in the upcoming roll-outs of the newest versions of Java. They were sorting out precisely which folk...
by jcg
Tue Jul 17, 2012 12:44 am
Forum: General programming discussion
Topic: Learning how to code
Replies: 10
Views: 6277

Re: Learning how to code

Check out these wonderful books available free online: http://mitpress.mit.edu/sicp/ , http://www.ccs.neu.edu/home/matthias/HtDP2e/index.html . Also, if you use the GNU Emacs `editor' (scare quotes because it is indeed much more than just an editor) there is a built-in `getting started' guide to ema...
by jcg
Mon Jul 16, 2012 11:48 pm
Forum: Other projects
Topic: Hooking up to e-ink display?
Replies: 17
Views: 16551

Re: Hooking up to e-ink display?

A rooted kindle (its a 500Mhz ARM running linux) could do that all on its own - but I suppose that's not the point ;) http://www.turnkeylinux.org/blog/kindle-root The trouble is, it is a very difficult job to plug a keyboard into a Kindle. AFAIK people have gotten close (manufactured serial connect...
by jcg
Mon Jul 16, 2012 10:54 pm
Forum: Off topic discussion
Topic: One of *those* days...
Replies: 30
Views: 5686

Re: One of *those* days...

Apologies up front for the long off-topic post, perhaps it should be moved to its own thread. liz: "Did you find anything worthwhile to do with it once jailbroken?" How about using it as a multi-function accessory module connected over USB to the R-Pi? Some links: "On my kindle I am root" http://www...

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