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usual user

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  1. You have provided far too little context, and I do not understand what you are talking about. But if it's just the output of a pattern waveform via a GPIO, you can do it with a one-liner from the command line: gpioset --toggle 100ms,100ms,100ms,100ms,100ms,300ms,300ms,100ms,300ms,100ms,300ms,300ms,100ms,100ms,100ms,100ms,100ms,700ms --consumer panic con1-08=active This is just an example and the emitted pattern doesn't meet your needs, but with adjusted timings it does exactly what you want. Of course, you can also write your application with program code. Libgpiod provides bindings for C++, python3 and Rust therefor.
  2. Overlays are always device-specific, and in most cases, even use-case-specific. Trying to share between different devices takes a huge amount of maintenance as opposed to a simple copy of a similar overlay. All possible interactions have to be taken into account and expecting NOOB users to understand their dependencies is asking for trouble. And if they do have to be different later, it is even more difficult to sort them apart. And besides, what advantage does it bring to the user, since all Armbian images only address one specific device at a time?
  3. A perfectly legitimate method, but not always available: This is not necessary, an overlay is just an overlay that overlays what already exists. Run the command "fdtoverlay..." three times in a row, keep DTB backups each time and compare them at last. This is a question for the one who came up with the overlay application method. Mainline kernel usually doesn't come with overlays, they are usually added by the Armbian build system. My method should also work in combination. Judging by the failure message, the overlay can't be found. You have thus proven that there is nothing wrong with the base DTB and the DTBO. It is to blame the tool (method) that is used to apply the overlay. Dynamic application of overlays at boot time is only necessary if the firmare can automatically detect the need to apply an overlay by reading hardware identifiers. This is a method inherited from the Raspberry Pi and has its justification with its expansion modules with hardware identifier. Using a configuration file (armbianEnv.txt) is just another way of statically selecting overlays and basically the same procedure as my method. I understand that overpaid Armbian developers implement something like this method out of boredom for devices that don't need it and then dynamically apply the statically selected overlays. But I prefer to rely on tools (fdtoverlay) that are more mature. After all, it's used in every kernel build (it's part of the kernel sources) and maintained by the mainline Devicetree developers. And if something didn't work with it, it would immediately stand out and also be repaired. Because kernels are very rarely built 😉
  4. Chances are, you've destroyed the integrity of the resulting DTB and the kernel can't even access the device with the rootfs. That dtso was more ment in @robertoj's direction to showcase gpio-line-names setup for this device. From the rest of your post, I don't really know what you're talking about. Nevertheless, I have written an overlay from scratch according to your recipe. For a first test, please disable any overlay application using the Armbian method in armbianEnv.txt and apply the overlay with my method. With an copy of your base DTB execute this command: fdtoverlay --input sun50i-h6-orangepi-3-lts.dtb --output sun50i-h6-orangepi-3-lts.dtb sun50i-h6-orangepi-3-lts-spi1.dtbo Now swap the currently used DTB with this one, reboot and test if it works as expected. After a successful test, you can try out the application with the Armbian method. sun50i-h6-orangepi-3-lts-spi1.dtso
  5. Out of curiosity and for my own education, I wrote the attached overlay. If you apply this to the base DTB of the orangepi 3 lts, the GPIO code of @robertoj should be able to run unchanged on this device as well. sun50i-h6-orangepi-3-lts-con1.dtso
  6. How to wait for a button press is outlined here. If you want to be able to write code that is device-agnostic, you'll need to set up generic gpio-line-names. See here for reference. With that in place e.g.: gpiomon --num-events=1 con1-08 && my-script will be able to run on any device that has the gpio-line-names set up in the same way. I.e. will wait at pin 8 of the first extention connector for an event.
  7. Ok, everything is as expected. So attached is the overlay source as promised and here is how to use it: To avoid path information in the commands, I use cd /boot/dtb/allwinner/ as the working directory. To compile the overlay, execute: dtc --in-format dts sun50i-h618-orangepi-zero3-con1.dtso --out sun50i-h618-orangepi-zero3-con1.dtbo This is an one-off action that has only to be repeated when the overlay source changes. To apply the overlay statically, execute: mv sun50i-h618-orangepi-zero3.dtb sun50i-h618-orangepi-zero3-native.dtb fdtoverlay --input sun50i-h618-orangepi-zero3-native.dtb --output sun50i-h618-orangepi-zero3-con1.dtb sun50i-h618-orangepi-zero3-con1.dtbo ln -s sun50i-h618-orangepi-zero3-con1.dtb sun50i-h618-orangepi-zero3.dtb By modifying the symlink, you can now easily switch between both or possibly multiple pre-build variants of DTBs, regardless of which overlay application method your system provides or not. If you don't want pre-built variant support, an in-place application is also possible with: fdtoverlay --input sun50i-h618-orangepi-zero3.dtb --output sun50i-h618-orangepi-zero3.dtb sun50i-h618-orangepi-zero3-con1.dtbo The application of the overlay must always be repeated if the base DTB changes (update). I've attached this feature to my kernel build process so I don't have to worry about it. The kernel install process is also an option to apply local overlays permanently. Of course, you can also use your OS's overlay application system. If you want to modify the label names, use my *.dtso as a template and choose a new overlay filename. In this way, both variants can exist at the same time and you can choose as you wish. Since this overlay only modifies one property value, it can even be applied repeatedly. I.e. with: fdtoverlay --input sun50i-h618-orangepi-zero3.dtb --output sun50i-h618-orangepi-zero3.dtb sun50i-h618-orangepi-zero3-my-labels.dtbo you can simply rewrite the property without any further necessary actions. I'm sorry that my method doesn't require patches or even rebuilding the entire OS and works in every system from userspace that has the DTC software package installed and the firmware get the DTB provided from the userspace (filesystem) for loading. Any system administrator should be able to execute the commands (either symlink adjustment or overlay application) from a running system and activate the changes by rebooting. sun50i-h618-orangepi-zero3-con1.dtso
  8. I've written an overlay that I think is correct. Since I don't have a Orange Pi Zero 3 I need your help to verify my work. Therefore I have applied my overlay staticly to your provided DTB. Please replace your existing DTB with the attached one. Reboot and post the "cat /sys/kernel/debug/gpio" output again. If everything works as expected, I will post the overlay source and explain how to use it. sun50i-h618-orangepi-zero3.dtb
  9. As allredy stated, a quite simple DTB overlay. See this thread as an entry point for discussions that have already taken place on this topic. More on gpio-line-names assignment can also be found in other posts of mine in this forum. But after the last posts in this thread I have doubts whether I should continue to participate here. IMHO the basic knowledge seems to be lacking, but they think to know exactly what the solution should look like and don't accept any other implementation. Something like this has repeatedly led to inconclusive discussions, which I am no longer prepared to engage in. If you'd like, I can try to walk you through creating a suitable overlay. For a first step, I need the output of cat /sys/kernel/debug/gpio from your running system and the DTB that is currently being used for your system. And last but not least, I need an online link to the DTB source of your device or is this already correct.
  10. This thread inspired me to tinker with GPIO again. I was curious to see how I would realize the example for myself. Since python is not my strong point, I chose a poor man's solution with "dnf install libgpiod-utils". I then ran this command: gpioset --toggle 100ms,100ms,100ms,100ms,100ms,300ms,300ms,100ms,300ms,100ms,300ms,300ms,100ms,100ms,100ms,100ms,100ms,700ms --consumer panic con1-08=active I'm wondering now what the flashing code could say, but I think a ham radio operator would know for sure what it means 😉 Recreating the python example wasn't really challenging with: gpioset -t1000 -Cblink-example con1-08=1 And besides, I find my flashing pattern much more interesting. I would be interested to know how something like this would be implemented with sysfs. Certainly not with a one-liner. These commands work the same way on all my different devices, i.e. it is used for all pin 8 of the first expansion connector. I find it more pleasant to address the pins with con1-xx than to deal with some device-specific gpio-lines again and again. Generated code is therefore portable and can be used on any device without modification, provided that the device can provide GPIO functionality on the corresponding pins. The only requirement is that the same gpio-line-name is used for the corresponding GPIO of the extension port. But this can be ensured by a simple DTB overlay. Creating such an overlay is a one-time effort for any device and the first thing I do for a device that I care off.
  11. The solution is outlined here but there was no incentive to land it in Armbian.
  12. The gst-play-hevc.mp4-pipeline.pdf is the visualisation of the pipeline composed by: gst-play-1.0 --use-playbin3 hevc.mp4
  13. FWIW I'm keep puzzled about the options you still throw at mpv. In my Wayland environment, I only have "hwdec=auto" and "hwdec-codecs=all" to automatically enforce video hardware decoding (v4l2 via drm KMS) and take into account all possible hardware decoders. This is necessary because otherwise SW decoding is preferred by default. I also don't understand why you insist on involving the GPU, it doesn't have any business in a video pipeline, as I just demonstrated here. The GPU is only used by the GUI and is therefore secondary. Video playback works perfectly even when no GPU driver is loaded at all.
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