robertoj

I meant to only change the kernel. I have never modified any of my SPI flash orange pis, because I fear bricking them.

Can you step back in armbian images until you find a linux version that doesn't show this problem?

In armbianenv.txt, erase the overlay “tve” (abbreviation of tv signal encoder) if you don’t use any analog outputs, can the pins be used as GPIO?

For anyone interested in connecting the ili9341 to an orange pi zero, and use the adafruit DRM driver: ili9341-spi1-drm.dts I made these experiments, since the LCD is the only one chip in the SPI bus. * disconnect the LCD's Chip Select -> LCD remains white * connect the LCD's Chip Select to GND -> LCD displays the login line and linux crashes soon after <- it might be my orange pi zero, which needs a heatsink Update: this thread also refers to orange pi zero 3... the solution (with touch function) is in this post: https://forum.armbian.com/topic/44191-orangepi-zero-lts-ili9341-tft-lcd-and-later-orangepi-zero-3/#findComment-204672

I simply rotated the image with the "rotation" parameter in the LCD DTS, and turned the screen 180 degrees physically. I will try the min, max swap later, but right now I am on a roll, making my tkinter apps work Another thing I will try is not using a chip select pin at all, since LCD and touch-chip are on different buses now.

I decided to use the gpio-spi driver, to emulate software spi just for the touch chip ADS7846/XPT2048, and use a different DTS file Here is what I think would work: ads7846-spi-gpio.dts I used these references: https://www.kernel.org/doc/Documentation/devicetree/bindings/spi/spi-gpio.txt https://stackoverflow.com/questions/78905378/how-do-i-use-spi-gpio-driver-in-linux https://gist.github.com/BjoernSch/39d3bca950a3b025b806decc2b686bbc and need to check this too: http://terminal28.blogspot.com/2015/12/bitbanging-spi-on-raspberry-pi-via-spi.html http://terminal28.blogspot.com/2016/05/enabling-spi1-on-raspberry-pi-bzero23.html My DTS compiles well but the linux in my armbian image did not include spi-gpio.ko, in /lib/modules/6.6.44-current-sunxi/kernel/drivers/spi/ Therefore, I am building a new OS image. Does anyone see a problem with my DTS? Update:) it works good stability now the only problem is that both x-axis and y-axis are reversed (not swapped). More updates on the way

Is it just for allwinner chips? Is this a change for good and toward stability, or is it a mistake?

Did you ever solve your problem?

Thank you. I will try that, and I learned about the xinput_calibrator, which I will apply next time. (and https://github.com/reinderien/xcalibrate/blob/main/xcalibrate is a new interesting project) Now I am focusing on moving the touchscreen pins to an independent gpio-based SPI set of pins... we will know whether the LCD crash is from interfering SPI commands. I did an experiment with the "backlight = <&backlight_gpio>" parameter as shown in https://github.com/beagleboard/bb.org-overlays/blob/master/src/arm/BB-LCD-ADAFRUIT-24-SPI0-00A0.dts and https://forums.raspberrypi.com/viewtopic.php?t=358240 but so far it ended up in a kernel not loading. I will leave this task for last. If the DTS configuration does not specify CPHA and CPOL, what is the default setting of the SPI protocol?

I learned netplan recently, because I was unable to use armbian-config or nmtui (the underlying mechanism used by armbian-config)

If it works all the time, nothing else gets disabled, no new dmesg warnings appear due to this, it would be a good indicator but a dtbo (compiled from a dts) sometimes need to be changed when Linux is upgraded (like some changes with spi and tft changes)… and the orange pi official OS images are very old. so in general, a dtbo copied from an old os to a new os, might not work all the time. Needs to be tested. do you see a dts file with the same name as the dtbo?

I missed the part where you ask for overlay help change directory to /boot/dtb/sun..../overlays/ There are several readme files, find the ones that apply to your H618 chip. Find an overlay that refers to USB host. Do you use a cable to convert USB-C to USB-A-female? If it works, then the next step after reboot is the lsusb test. Also, look at any error messages printed by both linux ko's dmesg|grep cp210x dmesg|grep usbserial execute "sudo armbianmonitor -u" and show your /boot/armbianEnv.txt

In newest Armbians, we are using netplan, instead of NetworkManager https://docs.armbian.com/User-Guide_Networking/ Edit a config file sudo netplan apply

https://github.com/raspberrypi/linux/issues/6067 https://github.com/raspberrypi/linux/pull/6029 https://forums.raspberrypi.com/viewtopic.php?p=2206990&hilit=ads7846#p2206990 https://github.com/raspberrypi/bookworm-feedback/issues/88 There seems to be some instability in the ads7846 driver in the latest linux. If anyone is having a good experience with ads7846, please indicate how you did it.

Does the esp32 show up as a ttyUSB or ttyACM when plugged to your Linux PC? is there something new in the result of lsusb? can you plug something else in that USB port? can you send a photo of your connections?

Can you show an example of spi-gpio being used for an ads7846 touch screen?

Whats the difference between 2 and 8? I am having similar doubts with an spi ili9341, but I don't knwo how that DTS line works

I could run lightdm with apt install xinit xterm xauth x11-apps xserver-xorg lightdm xserver-xorg-input-evdev xserver-xorg-video-fbdev /usr/share/X11/xorg.conf.d/99-fbdev.conf: Section "Device" Identifier "myfb" Driver "fbdev" Option "fbdev" "/dev/fb0" EndSection However, the cursor is moving at 90-degrees from my finger movement. Also, it is very unstable... it crashes, leaving a white screen. The white screen remains after reboot, and I can only make it work again by removing and connecting the 5V power. Can someone share how they installed a window manager with ili9341? is 24MHz too fast? Would native cs1 help anything?

problem solved: IRQ i/o needed the reverse polarity in pendown-gpio. armbianEnv.txt and DTS here: (it is working with sudo evtest, so I dont know if it needs calibration... and I wonder if I need to reverse the polarity in the interrupts line too)

I had some success by changing the touch chip pins from: CS1=PC7 PA18 (I avoided the "native Spi0 CS1 PC7" and used PA18) IRQ=PA19 PA7 (maybe this was unnecessary) New DTS: With inspiration from https://github.com/jonathan-gatard/ili9486-xpt2046/tree/main for the IOs and the analog parameters Now sudo evtest prints an event each time I press on the LCD screen If an LCD suffers a disconnection and reconnection, is it possible to reset, re-initialize and continue working the LCD? Or would it always need a Linux reboot?

When doing sudo evtest, I get random events. It may be related to https://forum.armbian.com/topic/15271-spi0-cs1-held-low-when-ads7846-is-loaded/

Hello I assume that the tft lcd is working 100%, displaying text and graphics. can you share what you get from the tests in my post here? also, what are your wiring connections? https://forum.armbian.com/topic/27457-connecting-banana-pi-m2-zero-with-ili9341-display-over-spi-on-latest-armbian-image/?do=findComment&comment=201947 Edit: your DTS seems to be missing a lot of connection definitions. Look at your DTS to the DTS that was posted last in my thread topic, and compare their structures.

I went with your corrected DTS ... so far it looks great (Did NOT use the spi-add-cs1.dtbo, as advised) I went out running to work, and I will continue tests when I go back home Day 2 of testing: evtest shows a random stream of events, then stops... then lcd touches dont get reactions. I will check my wiring and order a new LCD, because mine has a cracked glass Is there any way to tell that the SPI, IRQ, CS inputs/outputs to the XPT2046 (ADS 7846) is working correctly, and blame everything on a bad resistive panel?

I tried all weekend to add the touch function of the LCD's XPT2046 With this DTS: It gets compiled, but the bootloader rejects it: Applying user provided DT overlay ili9341-touch-sp0.dtbo failed on fdt_overlay_apply(): FDT_ERR_NOT_FOUND Error applying DT overlays, restoring original DT (i included the spi-add-cs1.dtbo as suggested in https://ryjelsum.me/homelab/xpt2046-ili9341-opi-zero/ )

Use a high db USB WiFi dongle, with separate 5V supply if possibel