Screen rotation

[deanfantastic]

Hi
I've tried editing /boot/cmdline.txt and /bott/config.txt but neither are affecting a screen rotation of the GPIO 3.5" LCD screen with touch. The HDMI output does rotate but I want the LCD to rotate the same way.

How can I make this work as I'm very out of my depth on this.

Thanks
Dean

[goodtft]

How to modify the display orientation

1. GPIO interface type LCD rotating display method:
   Suitable for GPIO interface type LCD (2.4” 2.8”3.2” 3.5”).
   Run command at Terminal:
   sudonano /boot/config.txt
   if you are using 2.4”, 2.8”or 3.2”, then find line “dtoverlay=tft9341”and add rotate parameter value as format following：
   dtoverlay=tft9341:rotate=value
   if it is LCD 3.5”, then find line “dtoverlay=tft35a” and add rotate parameter value as format following：
   dtoverlay=tft35a:rotate=value
   Take LCD 3.5”as example:
   To rotate 0 degrees (vertical screen display), the corresponding parameter value:
   dtoverlay=tft35a:rotate=0
   To rotate 90degrees (horizontal screen display), the corresponding parameter value:
   dtoverlay=tft35a:rotate=90
   To rotate 180degrees (vertical screen display), the corresponding parameter value:
   dtoverlay=tft35a:rotate=180
   To rotate 270degrees (horizontal screen display), the corresponding parameter value:
   dtoverlay=tft35a:rotate=270
   Press Ctrl + X, choose Y, save and exit; and re-start to achieve..

[deanfantastic]

Does this also rotate the touchscreen as currently, I'm using:
dtoverlay=piscreen,speed=16000000,rotate=270 which rotates the display but not the touchscreen

[VivienGiraud]

@deanfantastic It won't works as it's not the same SPI interface, if I found a solution I will post it here :)

[deanfantastic]

Thank you.

[VivienGiraud]

These links might help you:
https://www.raspberrypi.org/forums/viewtopic.php?t=143581
https://ubuntuforums.org/archive/index.php/t-1493407.html
Please keep us in touch if it works, I don't have a piScreen so I can't test.

[VivienGiraud]

Adding this:

        Option "InvertY" "true"
        Option "InvertX" "true"

To /etc/X11/xorg.conf.d/99-calibration.conf
Just before EndSection
I tried it with mine (Kuman 3.5") and it worked :D

[deanfantastic]

Oh I'm not using a PiScreen, some kind of knock-off.

Tried all the above with SwapAxes and SwapXY but neither were effective.

Section "InputClass"
        Identifier      "calibration"
        MatchProduct    "ADS7846 Touchscreen"
        Option  "MinX"  "3652"
        Option  "MaxX"  "62360"
        Option  "MinY"  "61728"
        Option  "MaxY"  "5342"
        Option  "SwapXY"        "1"
EndSection

and

Section "InputClass"
        Identifier      "calibration"
        MatchProduct    "ADS7846 Touchscreen"
        Option  "MinX"  "3652"
        Option  "MaxX"  "62360"
        Option  "MinY"  "61728"
        Option  "MaxY"  "5342"
        Option  "SwapAxes"        "1"
EndSection

[VivienGiraud]

Yeah it didn't works, you should try my solution.
Adding this:

        Option "InvertY" "true"
        Option "InvertX" "true"

[VivienGiraud]

On my side it works flawlessly !

[texadactyl]

Viv, please publish your config.txt setting for dtoverlay=tft35a parameter and the entire /etc/X11/xorg.conf.d/99-calibration.conf contents.

Thanks.

[texadactyl]

Not intuitive at all. The documentation is pathetic. Sorry, goodtft, but it is true.

I started with a fresh raspbian install and LCD-show from github. I stood the display up such that the power chord and HDMI adapter are pointing up (the way I want it when I deploy it). This setting in /boot/config.txt worked for me:

     dtoverlay=tft35a:rotate=270

I observed:

rotate=0 top of screen is at physical left
rotate=90 top of screen is at physical bottom (up-side down)
rotate=180 top of screen is at physical right
rotate=270 top of screen is at physical top (right-side up)

It matters not what the contents of /etc/X11/xorg.conf.d/99-calibration.conf are. I left the file as it was installed except following the touch-screen calibration instructions.

[texadactyl]

My screen display orientation was solved. But, my touchpad was inverted when I used one of my Tk applications and the desktop in general. Viv's solution worked for me.

goodtft, your documentation sorely needs a refresh.

[VivienGiraud]

@texadactyl Sorry for being late, really happy if my solution worked for you! You can close this one, and if you think documentation needs a refresh please open a new one with info related to.
Anyway I'm happy it works for you now, I'm really having funny with so, yeah! have fun with it too!

[texadactyl]

deanfantastic was the originator and, therefore, should close it. I don't know if this person has resolved their issues.

[texadactyl]

Okay, I suspect that deanfantastic lost interest in the thread he started. I tried to close this issue but I am not permitted to.