Enabling USB Touch Screen - How?

[goingalong]

I have just received via ebay an unbranded "7 inch USB Capacitive Touch Screen Display LCD 800x480 HDMI" I have the display working but not the touch screen input from USB. The limited specification says that the touch screen controller is STM32-103.

I can see live touch data coming as a stream into /dev/usb/hiddev0 but obviously need to configure the system to recognise that data.

I am using Raspian (latest update) and lsusb gives:

Bus 001 Device 005: ID 0eef:0005 D-WAV Scientific Co., Ltd

My question is - has anyone succeeded in bringing this type of screen into use and if so how?

Obviously this is a little tricky without knowing the brand details so I am "hoping" for a generic solution.

[Mikchel]

The question is old enough but i will answer. May be it will help.
I have similar touchscreen from Eleduino shop.
Please have a look on:
https://github.com/bsteinsbo/rpi_touch_driver

I compiled this app and it works with this touchscreen.

WBR,

[supermoose]

Hi guys,

Can a projector be connected to the touch screen by VGA cable?

Please let me know. Thanks.

SuperMoose

[supermoose]

Is there any large touchscreen (24 inch) that can be connected to Raspberry Pi 2?

[klricks]

Is there any large touchscreen (24 inch) that can be connected to Raspberry Pi 2?

I have Hannspree H231 (23") touch (USB) monitor which works with my RPi (Raspbian Wheezy). The screen is 10pt touch but only seems to act as a limited single point mouse mode on the RPi. The mouse pointer moves to where you touch the screen, then you double tap to open an icon or menu item.... nothing else.
It's been some time since I tried it so there may be some improvements?

[blc]

The question is old enough but i will answer. May be it will help.
I have similar touchscreen from Eleduino shop.
Please have a look on:
https://github.com/bsteinsbo/rpi_touch_driver

I compiled this app and it works with this touchscreen.

WBR,

For anyone else encountering the same issue with similar screens - 7", HDMI interface, USB touch input - this is probably the best answer. I have a 5" version which only has single-point resistive touch, but this driver doesn't work with my screen. I raised an issue on the github repo to try and ask for help, but the author hasn't been active on github since July last year - I don't think I'm going to get an answer...

I've been looking at the code this evening and I may have figured out a workaround. Probably won't be able to test it for a couple of days though, and I'm not a C programmer so I'm probably totally wrong.

EDIT: For those who may be interested... The author's driver expects a 25-byte touch input event over USB, but using xdd I've discovered that my screen seems to send a 22-byte event (https://i.imgur.com/SLkGJza.png). I think I've worked out how to modify the code so that it sends fewer uinput touch events but it's only theoretical at this point. I don't know C, I don't know uinput, and I don't know Linux drivers!

[supermoose]

Is there any large touchscreen (24 inch) that can be connected to Raspberry Pi 2?

I have Hannspree H231 (23") touch (USB) monitor which works with my RPi (Raspbian Wheezy). The screen is 10pt touch but only seems to act as a limited single point mouse mode on the RPi. The mouse pointer moves to where you touch the screen, then you double tap to open an icon or menu item.... nothing else.
It's been some time since I tried it so there many be some improvements?

Wow, Klricks, thank you for your reply. Finally someone replied me:). So did anyone try to do a presentation (PPT) with Raspberry? Why youtube has no one shows a video to do ppt with Raspberry? Will it lag or be slow?

[klricks]

Is there any large touchscreen (24 inch) that can be connected to Raspberry Pi 2?

I have Hannspree H231 (23") touch (USB) monitor which works with my RPi (Raspbian Wheezy). The screen is 10pt touch but only seems to act as a limited single point mouse mode on the RPi. The mouse pointer moves to where you touch the screen, then you double tap to open an icon or menu item.... nothing else.
It's been some time since I tried it so there may be some improvements?

Wow, Klricks, thank you for your reply. Finally someone replied me:). So did anyone try to do a presentation (PPT) with Raspberry? Why youtube has no one shows a video to do ppt with Raspberry? Will it lag or be slow?

I think most people would not want to buy a large touchscreen monitor just for a RPi so not many reply. I use my monitor for Windows 10 but hardly use the touch for that. I only connected my RPi temporarily to try it.

I just tried again, this time using the latest Raspbian Jessie. The touch functions are similar to what I described above.... Single touch 'mouse mode' only.
Just noticed the calibration is off. Good at the center of the screen but not accurate around the parameter of the screen. Don't know how to calibrate it?

For PowerPoint presentations you would need to use LibreOffice Impress. Haven't tried it myself.

[lsegalla]

Correct me, if I'm wrong, but your device seems to be one of these...
http://www.waveshare.com/wiki/Main_Page

I have one, and I'm getting the same string with lsusb command (but mine is a different model from yours).
I still have problems with mine when I use the backlight on (so I can't use it, but I have another open thread).

However in the link I've just posted here you should find informations to make it work...
There's also an official site, completely in chinese, I don't get a single word from that...
But when I opened the box I saw that there where complete instructions on the back of a sheet, and they was based on simple editing of the /boot/config.txt (but they are missing something, because I'm not able to get my touch full working with the backlight)

[lsegalla]

By the way, I'm planning to contact them, to see if they can give me some useful informations.
Here there's their contacts:

Our working time:
09:00-18:00 (Monday to Saturday)
(sales) sales@waveshare.com
(after-sales) service@waveshare.com
(complaint) complaint@waveshare.com
(apply for distributor) sales07@waveshare.com

Skype: wvshare

Tel: 86-755-82807524
Fax: 86-755-83042572

Address: Waveshare Electronics
Rm 813, Dynamic World Building
Zhenhua Rd, Futian District
Shenzhen, China