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Have you ever envied your friends" sweet touch screen systems in their car? Do you look at the dash of your old and decrepit 1992 Isuzu Rodeo and dream of having a slick computer system in your car? Well, your in luck. This Instructable will be your guide on building a system that is low cost and easy to build; it doesn"t even require special tools.

The CarPC runs off of a Raspberry Pi Model B running Xbian, a version of XBMC made for the Pi. The touch screen is resistive which, while not ideal, keeps cost down and is easily available through Amazon. It has the capacity to play music, watch videos, look at pictures, play games, and much more.

A detected touchscreen will also cause the fbheight and fbwidth parameters in /proc/cmdline to equal 480 and 800 respectively (the resolution of the screen). You can verify this by running:

Depending on your display stand, you might find that the LCD display defaults to being upside-down. You can fix this by rotating it with /boot/config.txt.

If some windows in X are cut off at the side/bottom of the screen, this is unfortunately a side-effect of developers assuming a minimum screen resolution of 1024x768 pixels.

At the moment you can’t use HDMI and the LCD together in the X desktop, but you can send the output of certain applications to one screen or the other.

In the previous article, I described the steps needed to install an LCD touchscreen on the Raspberry Pi. In this article, I will show you how to adjust the screen rotation of the LCD to landscape mode, and will show you how to calibrate the touchscreen pointer for optimal accuracy. Just follow the steps below to compete the process of setting up your Raspberry Pi LCD touchscreen:

1. First we need to change the setting for screen rotation in the /boot/cmdline.txt file. This setting is called fbtft_device.rotate=X. By default, this is set to X=0, which results in a portrait mode screen orientation. In order to switch the orientation to landscape mode, change fbtft_device.rotate=0 to fbtft_device.rotate=90. Enter sudo nano /boot/cmdline.txt at the command prompt. There should only be one line in this file. Go to the end of it and you will find the fbtft_device.rotate=X setting. Change the value from 0 to 90:

However, if you try to touch the screen now, you will find that the pointer movement does not correspond to your finger movement. This is because the LCD screen driver and the touchscreen controller driver have separate settings for screen rotation. We need to change the rotation of the touchscreen controller driver to match the rotation of the LCD screen driver.

2. You probably noticed that dragging your finger to the right moves the pointer up, not to the right. This indicates that the x and y axes of the touchscreen are swapped. To correct this, we need to swap the x axis for the y axis. This can be done by changing the swap_xy=X parameter in /etc/modules.

Enter sudo nano /etc/modules at the command prompt to edit the file. Go to the line for the ads7846_device parameters and move the cursor to the right to find it:

Now if you drag your finger around the screen, you will notice that the y axis (up and down) is correctly aligned with the motion of your finger. However, the x axis (left and right) is still inverted. To fix this, we need to install two more kernel modules, xinput and evtest. xinput is a Linux utility that will allow us to configure input device settings for the touchscreen controller, and evtest is an input device event monitor and query tool.

After the Pi finishes rebooting, you should notice that when you move your finger across the touch screen, the pointer should follow correctly in both axes. If you are using the Raspberry Pi 2 Model B, you will need to complete the calibration steps below before the pointer follows your finger correctly (and make sure that you have enabled startx to load automatically – see step 6 in this article).

You can rotate the screen 90 degrees (as we did in this tutorial) and the power connector will be at the bottom of the screen, but you can also rotate it 270 degrees so that the power connector is at the top of the screen. To do this, simply enter fbtft_device.rotate=270 in the /boot/cmdline.txt file. Then change the DISPLAY=:0 xinput --set-prop "ADS7846 Touchscreen" "Evdev Axis Inversion" 0 1 line in the /etc/X11/xinit/xinitrc file to DISPLAY=:0 xinput --set-prop "ADS7846 Touchscreen" "Evdev Axis Inversion" 1 0. All you need to do is switch the values of the 0 and 1 at the end of this line.

Now that we have our LCD touchscreen up and running, the final step in the installation is the calibration of touch control. This will make the pointer much more accurate and easier to use.

2. Now we need to install the calibration tool we will be using, xinput_calibrator; and other filters for controlling the touchscreen response. Install the tslib library by entering aptitude install libts-bin:

4. Now we can use ts_calibrate. Enter ts_calibrate at the command prompt (make sure you are still in root mode) to run the ts_calibrate program. The program will consecutively display five crosses on different parts of the screen, which you need to touch with as much precision as possible:

Drag the cross around the screen and observe how closely it follows your finger or stylus to test the accuracy of the calibration. Now press the “Draw” button to enter the drawing mode:

This is kind of a long process, but it is well worth it if you want to get the LCD touchscreen set up properly. So if you have any trouble setting this up or have anything to say, please leave a comment below. Also, if you found this article useful, please share it with your friends!

I can cross compile the kernel with tsc2007 module from source, and can load the module, and can be found with lsmod. But still no function, that"s why I haven"t post here.

See if this module (tsc2007) is supported (YES it IS): http://git.kernel.org/cgit/linux/kernel/git/dtor/input.git/plain/drivers/input/touchscreen/Kconfig?id=HEAD

Having purchased a Tontec Touch Screen (Model MZ61581) for the Raspberry Pi from Amazon I went about following the instructions found via the product description. These instructions are what I used for the Raspberry Pi 2 (or Model B+). I was using the 2015-05-05 version of raspbian-wheezy.

We now need to update our firmware to the newest version to support Tontec screen. Check that your date is correct (step 1) before starting this process.

My first attempts failed with a white screen on the Tontec. Further investigation via the main HDMI showed that the boot sequence was freezing on fbtft_register_backlight:

(Edit) This is actually normal behaviour and once the Tontec screen was working the main screen still froze at this point. I contacted iTonTec support and they suggested running

did you manage to calibrate your screen? I followed the instructions in the document provided by tontec but the option “calibrate touchscreen” is not available in the menu…

Great Summary – worked fine for jessie and Raspi3