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Z-Bolt / OctoScreen

LCD touch interface for our OctoPrint
GNU Affero General Public License v3.0
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FEATURE REQUEST: Support for 2.8" PiTFT #72

Open kieppie opened 4 years ago

kieppie commented 4 years ago

I'm making use of an old but quite common "XC9022" - aka. Adafruit PiTFT - 320x240 2.8" TFT + Resistive Touchscreen with the 4 GPIO buttons (#'s 23, 22, 27 & 18 - tested OK) populated.

Managed to get the screen firing up well & touchscreen calibrated using the Adafruit scripts/guides:

Unfortunately OctoScreen does not play/scale nice, and I've tried resorting to the fbcp "hack", but not getting great results:

from what I can tell, fbcp also adversely affects the use of the touchscreen interface, so that's a no-go

Is there a possible (simple) solution to this, and/or would it be possible to support this common piece of hardware in a future build?

(related request - would it be possible to support the 4 GPIO buttons in some manner?)

AstroClimber commented 4 years ago

Not sure if this will help to resolve your issues, I'm using the PiTFT 2.8" 2423 Capacitive Screen. Here are the steps I took, after installing OctoPrint on Raspberry Pi using the OctoPi OS image.

  1. I have successfully configure my screen on RPi 3B with Adafruit Easy Installation guide. I used the HDMI mirror option and set the screen to be landscape (option 1 or 3).
  2. I following the instruction on https://github.com/Z-Bolt/OctoScreen: wget https://github.com/Z-Bolt/OctoScreen/releases/download/v2.5.1/octoscreen_2.5-1_armhf.deb sudo dpkg -i octoscreen_2.5-1_armhf.deb
  3. Go in /etc/octoscreen/config and add 320x240 to the resolution configuration parameter as, OCTOSCREEN_RESOLUTION=320x240
  4. Go into /boot/config.txt, and edit the framebuffer_width, framebuffer_height and hdmi_cvt lines to, framebuffer_width=660 framebuffer_height=390 hdmi_cvt=660 390 60 1 0 0
  5. Modify the touch-swapxy and touch-invy or touch-invx field under dtoverlay in /boot/config.txt (See the next two comments for further details'
  6. sudo reboot
  7. Optional: If octoscreen does not start automatically, add systemctl start octoscreen & to the file /etc/rc.local right before the line exit 0. Note the & seems to be crucial to make it work, I tried without it and it failed to start OctoScreen. See Issue #34 for more infor on this.

Remaining issue [Solved, see the following two comments for solution]: After rotating the PiTFT 90 or 270 degree to be landscape, the OctoScreen show that all the features are displayed properly, but when I touch them, the buttons seem to still think the screen is in the portrait 0 degree orientation. So far, this article is what I found regarding to how HDMI and the touch screen rotations are two different things. I don't know if this is the PiTFT driver issue or a configuration in OctoScreen. Any insight or able to duplicate my problem will be helpful. Thanks.

AstroClimber commented 4 years ago

Remaining issue: After rotating the PiTFT 90 or 270 degree to be landscape, the OctoScreen show that all the features are displayed properly, but when I touch them, the buttons seem to still think the screen is in the portrait 0 degree orientation. So far, this article is what I found regarding to how HDMI and the touch screen rotations are two different things. I don't know if this is the PiTFT driver issue or a configuration in OctoScreen. Any insight or able to duplicate my problem will be helpful. Thanks.

OK, from the link posted in the quotation here, I found the parameters that help to flip the PiTFT around. For the 2.8" Capacitive, they are

/boot/overlays/pitft28-capacitive-overlay.dtb Name: pitft28-capacitive Info: Adafruit PiTFT 2.8" capacitive touch screen Load: dtoverlay=pitft28-capacitive,= Params: speed Display SPI bus speed rotate Display rotation {0,90,180,270} fps Delay between frame updates debug Debug output level {0-7} touch-sizex Touchscreen size x (default 240) touch-sizey Touchscreen size y (default 320) touch-invx Touchscreen inverted x axis touch-invy Touchscreen inverted y axis touch-swapxy Touchscreen swapped x y axis

To make the update, add these two lines in /boot/config.txt and reboot. You may need to play around to get the X/Y flipping correct to the screen orientation you set. dtoverlay=pitft28-capacitive,rotate=90,speed=32000000,fps=20 dtoverlay=pitft28-capacitive,touch-swapxy=true,touch-invy=true

Could be similar to the resistive one.

AstroClimber commented 4 years ago

To make the update, add these two lines in /boot/config.txt and reboot. You may need to play around to get the X/Y flipping correct to the screen orientation you set. dtoverlay=pitft28-capacitive,rotate=90,speed=32000000,fps=20 dtoverlay=pitft28-capacitive,touch-swapxy=true,touch-invy=true

Apparently the instruction in that link is not accurate. I have to rotate 270 degree and by separating the dtoverlay into two separate line actually mess things up. I have to comment out the default dtoverlay lines and add the following (and ignore the speed and fps setting since there is 79 character max for the dtoverlay line apparently) and Voila, it works! #dtoverlay=pitft28-capacitive,rotate=270,speed=64000000,fps=30 dtoverlay=pitft28-capacitive,rotate=270,touch-swapxy=true,touch-invy=true

AstroClimber commented 4 years ago

In case you want to control the backlight of the PiTFT after shutting down (it stays on after RPi is shutdown), check this document out from Adafruit