USB Touchscreen Support

[adri....@gmail.com]

Hello, I'm searching for touchscreen that can work with Android RPI. I've found that:

https://www.adafruit.com/product/2407

They say: "The touch screen shows up as a USB mouse so no special drivers needed. We've tested it sucessfully on Mac, Windows, and Debian Linux (Raspbian on a Raspberry Pi). Other Linux distributions may or may not work,"

Is it really should work on android-rpi?

Thanks you

PS Sorry I opened an empty message two minutes ago

[WalkOnATYCLB]

I got the official Raspberry pi screen it does not work.

[Dennis Smith]

If the screen is a USB mouse then yes in theory it should work, if
it's any other type (such as SPI/i2c) then it would require some form
of library or driver to interface it with.

Dennis Smith
M1DLG

On 28 September 2016 at 17:48, WalkOnATYCLB <walkon...@gmail.com> wrote:
> I got the official Raspberry pi screen it does not work.
>

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[plm....@gmail.com]

I have USB eGalax and doesen't work out of the box.

I tried to recompile kernel with official drivers patches and I failed... doesen't work.

[Igor Kalkov]

Did the compilation fail or didn't it work after successful compilation?

Any messages in the kernel log?

[plm....@gmail.com]

The compilation work well, but after boot up I run "cat /proc/bus/input/devices" and doesn't show up the touch screen.

Maybe I did something wrong. This is what I did step by step:

- repo sync (https://github.com/peyo-hd/local_manifests/tree/nougat)

- I changed kernel modules support in "arch/arm/configs/bcm2709_defconfig"

    CONFIG_INPUT_EVDEV=y
    CONFIG_INPUT_UINPUT=y
    CONFIG_HIDRAW=y
    CONFIG_HID_MULTITOUCH=m

- I changed (added a few lines of code from manufacturer guide) in next files:

    /drivers/input/evdev.c

    /drivers/input/mousedev.c

    /drivers/input/joydev.c

- I run:

    ARCH=arm scripts/kconfig/merge_config.sh arch/arm/configs/bcm2709_defconfig android/configs/android-base.cfg android/configs/android-recommended.cfg

    ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make zImage

- I downloaded rtandroid-7.0, and replaced zImage from boot folder with my compiled one (/kernel/rpi/arch/arm/boot/zImage) and then I installed to SD.

This is the manufacturer PDF installing guide: https://drive.google.com/open?id=0B9xcVJutcWuBQU9fOVlkOUJKOXM

Thank you for your help!

[Igor Kalkov]

After boot, run "dmesg" in the console and check for touchscreen-related messages. You can also add some debug output to the source code to check if relevant functions are called.

Besides of that, you might need to compile/install additional modules.

[WalkOnATYCLB]

Do you think we are getting closer for support on the official Raspberry pi touch screen?

[Kevin Broten]

The afafruit backpack should work. Depending on what mode it was set to. It works as a mouse device. HID touchscreen or HID generic device. This mode can be changed using vender software. But you need windows xp. Each mode will change the VID/PID sent. The vender id does not seem to be a valid registered id. So correctly uniquely identifying the device could be a problem. The device is designed to be a MS Windows standard HID input device. When programming the firmware it must be done as a HID generic device.

[th3h3...@gmail.com]

I've been able to use my USB touchscreen without any problems with the latest build of the RTAndroid for the pi 3. The touchscreen I'm using is: https://www.amazon.com/ViewSonic-TD2230-Screen-LCD-Monitor/dp/B01DKPJVIS/ref=sr_1_1?s=electronics&ie=UTF8&qid=1477624718&sr=1-1&keywords=ViewSonic+TD2230

This USB touchscreen has been tested and also works with the following:

http://geektillithertz.com/wordpress/index.php/2016/08/26/android7-raspberry-pi-3/

http://geektillithertz.com/wordpress/index.php/2016/06/26/androidpi3cpugpu-update/

[Igor Kalkov]

I've heard small(er) touch screens from Waveshare are also working. I've ordered one yesterday, but didn't test it myself yet.

https://www.amazon.com/gp/product/B01HPV7M4I/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1