Multitouch experience on Joojoo

I’m writing this blog post just to remember what i’ve done, and how. Don’t want to forget it for the next time πŸ™‚ It’s incomplete, and done for developer.

Last week, i’ve got a Joojoo, the old named “Crunchpad”. The hardware look good: Intel ATOM N270 + NVidia ION (GeForce 9400M) + 4Go SSD + 1Go Ram + 1.3M Webcam + USB + eGalax dualtouch screen + Wifi. At least, it look like a good hardware to hack on. Before you ask, i’ve buyed this tablet cause of NVidia ION, it support OpenGL 3.0, enough to run PyMT ! I’ll not say anything about the default OS installed on Joojoo… but will start directly how to install custom OS on it.

How to install custom OS on JooJoo

  1. You can use any usb device on the joojoo (CD or USB). I’ve used Unetbootin to create a custom USB boot key for Lucid Ubuntu. Don’t select net install, wifi driver is not included in the setup.
  2. Plug a usb switch + usb keyboard + usb key on the usb port of Joojoo
  3. Stay pressed on the DEL key + press twice the power button (once to make Joojoo logo appear, and a second longer to power the screen)
  4. In the boot menu, change the order of Joojoo SSD and your USB key, to make your USB key primary.
  5. Reboot by pressing twice the power button as described.

If you see nothing on the screen, reset the joojoo with the tool, and press the power button twice again.
Twice is really important, without that, the screen will stay black. On the second time, you must see the screen power up.

About drivers :

  • The default wifi driver is not working, so go on , search for 8192SE, and take RTL8192SE drivers for linux 2.6.
  • For Nvidia ION, just download latest drivers from
  • For touchscreen… that’s the whole problem. It’s not working by default. You can use the constructor driver available, but dual touch is not working.

So, i’ve buyed this tablet for Dual Touch + OpenGL 3.0… Let’s check if windows is working with dual touch.

How to install window 7 on JooJoo

On this part, i would like to thank a lot Fabien for his experience on this domain.
The problem is, with 4Go SSD, you can’t install Normal Windows Seven. You must build a custom Window. To do that :

  1. go on Microsoft Windows 7 Embedded
  2. download the Standard 7 Toolkit
  3. launch the image configurator
  4. select all the things you want on windows… Like Window desktop, USB Boot, Power Management… I’ll upload my “answer” file tomorrow.
  5. your image must be < 2Go.
  6. burn your answer on usb (Tool menu). You’ll have a USB boot key ready to install Window Seven Embedded !

Then, it’s the same step as before, plug, reboot, install.

After installation of eGalax windows driver, the touchscreen work with dual touch !

How to capture USB on windows seven ?

Since wireshark is not able to capture USB, and no free toolkit is able to do it at this moment, i’ve used HHD Usb monitor, in trial version. Just run it, select Raw capture, Start, play with the screen, reboot the screen, play again with the screen (1 finger, then 2). And export the whole capture into HTML.
And here is the Joojoo eGalax USB Capture.

And that’s a bingo. We have bulk message with a 0x6 len, and other with 0xc len (double of 0x6.) Look really like we got 2 touch ! I don’t know what is the setup message, but look like theses messages activate the screen ! Now… go back on linux to test πŸ™‚

Check eGalax dual touch support with python-usb

Enable usb_debug (optionnal)

Ok, this was really easy, cause of the old experience of Hack of Dell SX2210T screen. Even if the experience was not a success, learning how USB work was really funny. First thing, activate USB sniffing to check if we are doing it right :

$ sudo modprobe usb_debug
$ sudo cat /sys/kernel/debug/usb/usbmon/0u (0u is where my device is connected)

You’ll have a bunch of message, as soon as you play with the device. You can read usbmon/usb_debug documentation about the format of the message.

Search your device with python-usb

When you’re searching for device on dmesg, you’ll have :

generic-usb 0003:0EEF:720C.0001: input,hiddev96,hidraw0: USB HID v2.10 Pointer [eGalax Inc. USB TouchController] on usb-0000:00:06.0-1/input0

You can also use lsusb :

Bus 004 Device 002: ID 0eef:720c D-WAV Scientific Co., Ltd

The 0EEF is your vendor ID, and 720C is your product ID. Let’s search our device in USB busses:

def get_egalax_device(vendor=0x0eef, product=0x720c):
    busses = usb.busses()
    for bus in busses:
        for device in bus.devices:
            if device.idVendor != vendor:
            if device.idProduct != product:
            return device
    return None

Send SETUP configuration

To understand more how USB work, you can check USB nut shell, the first part is talking about Setup packet.
This is exactly what we want, since on the capture we have :

000006: Control Transfer (UP), 02.08.2010 01:50:04.275 +0.0. Status: 0x00000000
Pipe Handle: 0x855dbe94

0A 01 41 0A 01 41

Setup Packet

40 00 00 00 00 00 06 00

Recipient: Device
Request Type: Vendor
Direction: Host->Device
Request: 0x0 (Unknown)
Value: 0x0
Index: 0x0
Length: 0x6

We have exactly 2 setup packet to transfer to the device. The most complicated is to understand python-usb.

  • Recipient -> usb.RECIP_DEVICE
  • Request Type -> usb.TYPE_VENDOR
  • Direction -> usb.ENDPOINT_OUT

So, let’s send the first setup packet. This packet activate the device to talk with us (we’re receiving lot of packet from him).

conf = '\x40\x00\x00\x00\x00\x00\x06\x00'
handle.controlMsg(reqType, usb.REQ_SET_CONFIGURATION, conf)

And the second request activate dual touch support (without him, we’re receiving only one touch) :

conf = '\x0a\x01\x41\x0a\x01\x41'
handle.controlMsg(reqType, usb.REQ_SET_CONFIGURATION, conf)

And, that’s done ! When we read the device, we are receiving packet !
The format is :

  • Flags : 8 bits (161 = ALIVE, 160 = UP)
  • X : 16 bits
  • Y : 16 bits
  • ID : 8 bits (65 = touch 1, 66 = touch 2)

The flags and id is not really flags/id… because the value is not common. But it’s not changing on pressure, and not in the time… Dunno why.

Still, here is the full source code of the eGalax Joojoo dual touchscreen with python-usb.

And after ?

Normally, 2.6.35 include eGalax driver, but it’s not working. Will check another day why the kernel driver don’t support dual touch for this screen !

THSF 2010 finished, debriefing.

First of all, thanks to every awesome guys i’ve meet on this event. In particular to Marc BruyΓ¨re who give me a nice seat in his appartment. And every other guys in the tetalab !

I’ve been in Mix’art – Myrys, where living lot of artists, very nice. Creativity and OpenMind spirit is the keyword of the place.
The event involved Corpus Media, and they made fantastic show, based on the body, with video visualization and voice/audio transformation. I’ve take lot of pictures of mix’art, myrys, just browse them a little bit to feel the spirit πŸ™‚

I’ve made a conference on PyMT on saturday. Unfortunatly, the streaming was cutted due to some guys using Free Internet connectivity for downloading torrents… Thanks guys ): Part of the streaming is available, but audio is desync. Specially for this event, you can see the Presemt application, made with Thomas and I. It’s available on PyMT-Apps : Presemt is a application to make dynamic presentation, based on PyMT.
I’ll record a little video, and push it on the website !
I think people have really appreciated the conference, and we already got new users πŸ™‚

During the workshop day, Jimmy ask me if we can do an SMS Wall with PyMT, and play with it… I’ve spend more than 1 hour to check how i can get SMS from my HTC Hero. And i found Remote Notifier. Once a message is received on my Phone, it broadcast a TCP Packet using Wifi. 30 minutes later, we’ve got our first version of the SMSWall.
With a nice girl from tetalab (i don’t remember his name :/), we’ve started to make a V2 on saturday, with some other vizualization. But i’ve not been able to finish the code…

During the last day, i wanted to play with their LedWall in construction. An awesome work made by Lionel and Fabrice. This was my first attempt to use Arduino… and success ! After fixing some issues in the Arduino code, they have been able to use a sketch: Camera -> Pixelize -> Gray scale -> Send to arduino.

Now, you can check the video :
THSF – PyMT SMSWall + Deaf people
THSF – Led Wall !

And the pictures :