lcd touch screen calibration quotation

2023-01-03 12:32:11

Firstly, I"ve already done this and it doesn"t work at all because the olimex script to generate "98-screen-calibration.conf" uses the section I edited. If you check my post, I have inserted the contents from the source file "98-screen-calibration.conf", which was generated using an unmodified script. You can also check in the script that different sections for a 7-inch LCD display have different values.

Do I understand correctly that {MatchProduct "1c25000.rtp"} section should have a different value in the configuration file (98-screen-calibration.conf)?

fdtoverlays=/usr/lib/olinuxino-overlays/sun7i-a20/som204-lcd-olinuxino-7.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/som-i2c2-ar1021.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/spi1-spidev.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/spi2-spidev.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/sun7i-a20-can.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/sun7i-a20-i2c2.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/sun7i-a20-spi1.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/sun7i-a20-spi2.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/sun7i-a20-uart3.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/sun7i-a20-uart4.dtbo /usr/lib/olinuxino-overlays/sun7i-a20/sun7i-a20-uart7.dtbo

lcd touch screen calibration quotation

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.

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:

3. The calibration tool we will use is called ts_calibrate. We will also be using a program to check the results of the calibration called ts_test. In order to use ts_calibrate and ts_test, we must first set proper environmental variables. Enter export TSLIB_TSDEVICE=/dev/input/event0 into the command prompt, then enter export TSLIB_FBDEVICE=/dev/fb1:

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:

This calibration data will be written to a calibration file called /etc/pointercal. To view the contents of this file, enter cat /etc/pointercal at the root command prompt.

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!

lcd touch screen calibration quotation

Enter service mode (Press the Additional Functions key, then 2, then 8, then the Additional Functions key again to enter service mode). #SSSW will appear on the LCD Display.

Each time you press the plus sign, the plus sign will move to a different spot on the LCD Display until the plus sign reaches the lower right hand corner of the LCD Display. When the plus sign reaches the lower right hand corner of the LCD, press the plus sign one final time and the Touch Panel XY Adjust screen will re-appear.

At this time, the calibration of the LCD Touch Display is finished. Keep pressing the Stop key on the Control Panel until Test Mode appears then press the Additional Functions key once to return to the normal Ready screen on the LCD Display.

lcd touch screen calibration quotation

I have a similar issue with the MF7470. My problem is that the touchscreen somehow lost calibration in such a way that all contacts are shifted up 20 pixels or so.

I can do some interesting things like #REPORT but it looks like I might have to change one of the numeric parameters for the touchscreen calibration, if it"s even available on this model.

lcd touch screen calibration quotation

The issue is that the touch area seems to be "bigger" that the screen. When I press the screen in the middle the cursor is in the same Place, but as I move to the borders of the screen the curser "falls behind", and when I"m right at the edge of the screen the cursor is about 10 mm in on the screen. So, I am unable to open the startmenu or perss any of the icons in the task bar.

However, when I run ts_calibrate and ts_test the touch works perfect! So I Think there might be something off with the X calibration. Or, is there a way to use tslib as driver for the touch screen in X?

But when I try to calibrate with the display up then I see only issues without any systematic diagnosis. Touch simply does not react at all!!! Or leads the cursor to the edge.

I did enter these new values in 99-calibration.conf, but they doesn"t seem to be used. What ever values I type I see no difference in the behaviour of the mouse pointer...

Also, after inspecting the logs for Xorg it seems like the 99-calibration.conf file should reside in /usr/share/X11/xorg.conf.d/ rather then /etc/X11/xorg.conf.d/. However, placing the file there doesn"t seem to be doing any magic. But, in the log files I can see that X11 are Reading the InputClass calibration placed in 99-calibration.conf.

I don"t Think I have an issue with my touch panel, since it works perfect when using tslib (sudo TSLIB_FBDEVICE=/dev/fb0 TSLIB_TSDEVICE=/dev/input/event2 ts_test).

I believe I have run into the same issue. I am able to verify everything is running fine with latest jessie with ts_calibrate, but I find the axis are flipped in X no matter how I configure the 99-calibration.conf.

mastermushi"s suggestion to revert to an older version of Raspbian is not an option for me. I"m adding this LCD to an RPi board already up and running, and I"m not gonna reconfigure everything again. I gave up on getting the touch to work properly in X, and I"m now gonna use the official RPi 7" screen instead.

I was unable to run the calibration script actually. And trying to run the calibration manually it failed saying that xinput_calibrator didnät support xinput as --output-type.

When I plug screen in, it works, but only covers about 80% of the screen. The right-most 20% is blank. No matter what changes I put in (that I read on this forum), the display will not fill in the right side.

I thought I was going mad. Changing the values in any conf file seemed to have no effect at all on my Pi 3/Stretch/Elecrow 5. The quoted post fixed it and when I go preferences-touchscreen calibration the values are saved with no intervention from me.

My Touchpanel 18,5inch. I have Raspberry pi 3 v2.8.1. I use it with mouse smoothly. There is a 10 mm side gap in the touchpanel. Calibrate touchpanel could not solve my problem.

lcd touch screen calibration quotation

The DS-3000-Pro display can be used with any of our USB or Wireless BLE load cell solutions. When powered up, it launches straight into an application that shows available connected USB load cells or Load Cell + USB/wireless BLE Interface pairs. A user can select the device to display values from, choose the units in which the values are to be displayed (lbs, Kgs, N etc.), zero out any initial values (Tare) and start displaying force/weight information on the LCD touch screen.

lcd touch screen calibration quotation

I cant get the touchscreen to work. I have tried 3 new screens and the radio says there is a controller but no luck. Is there a setting to activate it? I dont remember there being on but Im getting old

El El mié, dic. 18, 2019 a la(s) 8:52 a. m., Mark Flavin escribió:0.6. I have the jumpers on as per the instructions.. In system info it shows a XPT2046 Touchscreen controller.

I have tried the touchscreen cal but when I try it doesn"t go to the cal screen. I have tried 3 displays and none work even though the radio detects the TS controller. Very strange. I doubt all three displays are bad but I suppose its possible.

do you hear the usual key beep when the screen is pressed during normal operation of the rig? The function is available in the Configuration menu at the Key Beep Volume item. If any other key causes beep but no touchscreen, then check the TS interrupt line (PA4), should go low when touch is pressed.

right on the dot! thanks.. I lost the touch screen control after what I think some sort of crash while setting the band on the screen and the grey band selector menu wouldn"t go away... then I had to shut the radio down, later I couldn"t use the touch any more, although it sensed the my touches, I also tried other options like resetting the firmware to default from debug menu... a couple of times.

lcd touch screen calibration quotation

I bought a NanoVNA H S/N:18100375. The touch screen does not work as supposed to do. I can navigate in menu only with the wheel equipped with push button. If I touch the screen the menu disappiers. Why? Does this model has a malfunction?

Also having problem with web-client. I click the web.client link on nanovna.com site but got a blank screen. Do I need any more sw to be installed? The unit is visable w/o any problem in device manager. I could install the 1.0.45 firmware easily but nothing has been changed with thees problems. Any idea? Joe, HA0LC

Yes I did but no changes after following the instructions given by unit. Making a touch test is also strange. It says drag panel and push button to finish. When I drag panel let say left down corner to up right corner I get only a vertical line showed on left side of LCD.

I had a similar problem with my H4 but got it working properly by opening the case, and then use an old toothbrush to brush the section where the LCD cable is soldered onto the board. It looks like a short was caused by some debris between adjacent tracks. Give it a good brush and try again. I had to repeat the process several times to clear the short.

Mine has only one pcb not two and the lcd is glued on the pcb. I worry to destroy it if I use power to unglue. The flat cable goes underneath the lcd into the glue somehow.

Ha a hiba továbbra is fennáll, lehetséges hiba, hogy a TFT LCD csatlakozásait rosszul forrasztották be. Ezt úgy tudod megnézni, hogy fogselyemmel finoman eltávolítod az LCD-t a pcb-től, ügyelve arra hogy ne húzd túl. Ekkor láthatóvá válik a forrasztás. Előfordult az ólommentes forrasztás következménye a szálas forrasztás miatti rövidzárlat. Ha ilyen akkor ott a hiba, rövid ideig tartó melegítéssel távolítsd el a rövidzárat.

These are due to a cover being received on the device and it may be pressed against the screen. Solution: Remove the cover, if the fault has disappeared, assemble it with a small plastic washer to prevent it from squeezing.

If the fault persists, it is a possible fault that the TFT LCD connectors are soldered incorrectly. You can see this by gently removing the LCD from the pcb with dental floss, taking care not to overdo it. The soldering becomes visible. There has been a short circuit due to lead soldering due to lead-free soldering. If this is the case, remove the short circuit by heating for a short time.

After clearing the error, perform the touch screen calibration and the device calibration. before switching off do not forget to save in configsave menu or from a terminal program.

lcd touch screen calibration quotation

We are using SX8650 touch ic and our LCD display resolution is 800*480. We were experiencing a touch offset around the edges of the display which is why implemented 5 point MSME based calibration to correct it. We get the six coefficients through it which when applied to received x-y coordinates corrects the offset issue considerably, this coefficients are also used to store for the next use. However the problem lies when we do a power on-off, retrieve the stored co-efficient and use them, the touch offsets then beacomes even worse. I am attaching the code for calculating the coefficients along with for the reference.

lcd touch screen calibration quotation

You can do verification measurements to assess the display chain"s (display profile - video card and the calibration curves in its gamma table - monitor) fit to the measured data, or to find out about the soft proofing capabilities of the display chain. You can also do a profile or device link (3D LUT) self check without having to take any further measurements by holding the “alt” key on your keyboard.

To check the fit to the measurement data, you have to select a CGATS testchart file containing device values (RGB). The measured values are then compared to the values obtained by feeding the device RGB numbers through the display profile (measured vs expected values). The default verification chart contains 26 patches and can be used, for example, to check if a display needs to be re-profiled. If a RGB testchart with gray patches (R=G=B) is measured, like the default and extended verification charts, you also have the option to evaluate the graybalance through the calibration only, by placing a check in the corresponding box on the report.

Note that both tests are “closed-loop” and will not tell you an “absolute” truth in terms of “color quality” or “color accuracy” as they may not show if your instrument is faulty/measures wrong (a profile created from repeatable wrong measurements will usually still verify well against other wrong measurements from the same instrument if they don"t fluctuate too much) or does not cope with your display well (which is especially true for colorimeters and wide-gamut screens, as such combinations need a correction in hardware or software to obtain accurate results), or if colors on your screen match an actual colored object next to it (like a print). It is perfectly possible to obtain good verification results but the actual visual performance being sub-par. It is always wise to combine such measurements with a test of the actual visual appearance via a “known good” reference, like a print or proof (although it should not be forgotten that those also have tolerances, and illumination also plays a big role when assessing visual results). Keep all that in mind when admiring (or pulling your hair out over) verification results :)

There are currently two slightly different paths depending if a testchart or reference file is used for the verification measurements, as outlined above. In both cases, Argyll"s xicclu utility is run behind the scenes and the values of the testchart or reference file are fed relative colorimetrically (if no whitepoint simualtion is used) or absolute colorimetrically (if whitepoint simulation is used) through the profile that is tested to obtain corresponding L*a*b* (in the case of RGB testcharts) or device RGB numbers (in the case of XYZ or L*a*b* reference files or a combination of simulation profile and testchart). If a combination of simulation profile and testchart is used as reference, the reference L*a*b* values are calculated by feeding the device numbers from the testchart through the simulation profile absolute colorimetrically if whitepoint simulation is enabled (which will be the default if the simulation profile is a printer profile) and relative colorimetrically if whitepoint simulation is disabled (which will be the default if the simulation profile is a display profile, like most RGB working spaces). Then, the original RGB values from the testchart, or the looked up RGB values for a reference are sent to the display through the calibration curves of the profile that is going to be evaluated. A reference white of D50 (ICC default) and complete chromatic adaption of the viewer to the display"s whitepoint is assumed if “simulate whitepoint relative to display profile whitepoint” is used, so the measured XYZ values are adapted to D50 (with the measured whitepoint as source reference white) using the Bradford transform (see Chromatic Adaption on Bruce Lindbloom"s website for the formula and matrix that is used by DisplayCAL) or with the adaption matrix from the profile in the case of profiles with "chad" chromatic adaption tag, and converted to L*a*b*. The L*a*b* values are then compared by the generated dynamic report, with user-selectable critera and ΔE (delta E) formula.

It sets the nominal (target) L* value to the measured L* value and a*=b*=0, so the profile is effectively ignored and only the calibration (if any) will influence the results of the gray balance checks. Note that this option will not make a difference for a “Single curve + matrix” profile, as the single curve effectively already achieves a similar thing (the L* values can be different, but they are ignored for the gray balance checks and only influence the overall result).

If you enable “Use absolute values” on a report, the chromatic adaptation to D50 is undone (but the refrence white for the XYZ to L*a*b* conversion stays D50). This mode is useful when checking softproofing results using a CMYK simulation profile, and will be automatically enabled if you used whitepoint simulation during verification setup without enabling whitepoint simulation relative to the profile whitepoint (true absolute colorimetric mode). If you enable “Use display profile whitepoint as reference white”, then the reference white used for the XYZ to L*a*b* conversion will be that of the display profile, which is useful when verifying video calibrations where the target is usually some standard color space like Rec. 709 with a D65 equivalent whitepoint.

lcd touch screen calibration quotation

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