Questions tagged [framebuffer]

A framebuffer is a memory buffer that contains a bitmap to be driven to a video display.

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No video output running on QEMU

I have been trying to set up a RPi 3b emulation on QEMU for testing software related to the framebuffer, and have got it working including networking, but not video. Doing ls /dev/, I can't find the ...
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Match tvservice device to fbset device

I would like to match the "tvservice" display device (iow, 2 for HDMI0 and 7 for HDMI1 and I think 5 for LCD) to the framebuffer device as used by "fbset" For now, I am hardcoding: ...
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2 votes
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Problem using vlc without X

After having used OMXPlayer for many years, I am now trying to install vlc for command line on a Raspberry Pi B+ (Buster Lite) without X: sudo apt-get update sudo apt-get upgrade sudo apt-get install ...
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2 votes
2 answers
643 views

How can I write an image to the RPI4 framebuffer in Raspbian Lite?

I can manage my own wallpaper on the RPI3 in Raspbian Lite by writing an image directly to the framebuffer with.. convert /path/to/image.jpg -write bgra:/dev/fb0 null: Running fbset I get the ...
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Raspberry Pi + LED Video Processor and resolution issues

I'm working on trying to get a P6 LED screen (connected via a NovaStar TB2 video processor). I've been playing with various options in config.txt but I can't seem to get it to display properly. This ...
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HDMI output does not fill full 800x480 TFT display

I have a Raspberry Pi running Raspberry Pi OS Lite (CLI only). The Pi is attached over HDMI, via an adapter, to a 7.0 inch 800x480 TFT display from Adafruit. When I boot up the CLI, the console only ...
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How to convert a Python / Kivy program from a Desktop Window to a stand-alone Raspberry Pi Kiosk

I have a Python program using Kivy to generate the GUI running in a window on a Raspberry Pi running the normal Raspberry Pi OS DeskTop & X Server. I want to convert this Python / Kivy program to ...
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Touchscreen on Zero W without X?

I'm designing a Raspberry Pi Zero W project with a touchscreen. I want to use this screen. Would there be a way to use the touchscreen on that without having X? I'll be using /dex/fbX for the display.
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2 votes
1 answer
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Running framebuffer application over ssh with display on TFT

I've got a RPi 2 running Raspi OS 2020-12-02 with Adafruit 3.5" TFT display - the display is configured correctly and displays console messages and as well can display images, for example when I ...
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raspberry pi 4B: writing to screen buffer / framebuffer

In the old days you could bypass system calls, bios calls, etc. by writing an ASCII character directly to a byte in the "screen buffer". Is there something similar with the raspberry pi 4b?
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Python pygame program won't run through SSH / Remote Desktop

I've been working on my own object recognition program based on the rpi-vision test program pitft_labeled_output.py (from this webpage). It's basically a custom neural network model and a bit modified ...
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2 answers
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Writing to framebuffer on C is very slow (Raspberry Pi) [closed]

I want to make a very intensive simulation and need the most power the Raspberry Pi gives me. So I flashed Raspberry Pi OS Lite (without Desktop) onto an Micro SD Card and wrote to the framebuffer in ...
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2 votes
1 answer
260 views

Pi4 start X server only on one HDMI output

I have coded a program to display a countdown using PySimpleGUI. I want to run it on one HDMI output of the Pi4. The other HDMI output should continue to run a regular frame buffer as I’d like to use ...
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0 answers
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display a cross-hair within a picture with python3

I want to add a cross-hair pointing to a position within a picture frame and display it. How could this be done effectively using python3? Which library would be preferable?
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1 answer
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Higher resolution framebuffer modes?

I have a raspberry pi plugged into a 3440x1440 monitor. Without setting any explicit framebuffer_* options in /boot/config.txt, it comes up at 1184x624. The display is crisp and legible but individual ...
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Possible to measure time of HDMI output generation based on framebuffer copy?

As the title may not be fully clear, here's a complete description of the problem. I've written a small library for the linux framebuffer usingmmap and some (higher) drawing routines, effectlively ...
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1 vote
1 answer
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Force a 16bit framebuffer when using a DPI display

I have a 16bit (565) display attached to a Pi with the DPI interface. The problem is that the framebuffer that gets set up is still 32bit and it looks like it's just dropping the LSBs to truncate the ...
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Is raspberry able to retrieve/store some n time prior a trigger with multiple cameras?

I came across a project idea which I think would demand a lot from a raspberry pi and arduino hardware capabilities. From my understanding, a master raspberry could be used to trigger n slaves through ...
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SPI Display – fbtft connects to wrong frame buffer

Today I installed an SPI display to my pi. I'm using fbtft and follow the wiki. I don't want screen mirroring, but force the SPI display to be a secondary monitor. I discovered, that fbtft connects ...
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1 vote
2 answers
1k views

/dev/fb0 is the wrong resolution

I noticed that when I plug my raspberry PI 3B+ into my monitor fbset reports this: mode "1824x984" geometry 1824 984 1824 984 32 timings 0 0 0 0 0 0 0 rgba 8/16,8/8,8/0,8/24 endmode This ...
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  • 141
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fbi application frozen and/or raspi frozen?

I'm running an electronic photoframe based on a Pi Zero W running Stretch lite 2018-11-13. The photoframe boots the auto login and starts a script that run "fbi" in loop to display images found in a ...
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Develop RPi framebuffer program on Linux laptop

Is there any emulator or some other way to develop a program for my 320x480 Adafruit PiTFT screen (available as /dev/fb1) on my Linux Mint laptop? The program currently gets images from Pi Camera, ...
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1 vote
1 answer
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What is the pixel format for Raspberry Pi framebuffer

Good afternoon, I'm trying to programmatically display an image to a 3.5 inch TFT display mounted on /dev/fb1 using the following code: Using trial and error I determined the pixel width to be 16 ...
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  • 131
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Showing an image on HDMI (DSI, HDMI screens connected)

I have a Raspberry Pi 3B device connected to a LCD '7 (7 inches LCD, its a touch screen I believe that's called DSI not sure) and also a HDMI screen. By default Raspbian considers the LCD as the ...
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2 answers
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Prevent text console from periodically switching to boot screen

I'm running arch linux (aarch64 kernel 4.16.9) on a Raspberry 3b, and using the text mode console on a monitor attached to the HDMI port. Everything basically works on the device, except for one ...
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1 answer
377 views

Is there a way to drive the display via HDMI from a systemd service

When my Raspberry PI starts it will start a process using systemd. At this point the display of the PI will be the standard PIXEL desktop. This process does not run as root. What I am looking for is ...
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  • 101
1 vote
0 answers
804 views

Running pygame without X results in stuck black screen

I'm trying to run a Pygame app without using X. I have a Raspberry Pi 3 with raspbian Jessie installed with very few modifications. The script I'm trying to run is the following: #!/home/pi/.env/bin/...
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  • 111
3 votes
1 answer
537 views

Conflicting dtoverlays and framebuffer

I have a RPi3 with latest standard kernel. I am making use of spi1. In config.txt I have the line: dtoverlay=spi1-3cs. I have 2 ADC's connected to spi1 and all seems fine, using an HDMI screen to ...
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1 vote
0 answers
570 views

Block Raspberry Pi from quitting fbi fullscreen (HDMI) to command line

I'm developing a parking control system in Python 3 which runs in headless mode at the Raspberry Pi startup and uses one RFID reader, one Barcode reader and many other devices but they really don't ...
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2 answers
2k views

Using ffmpeg to capture whatever is being globally sent to video output (ie: hdmi output)

I have setup a RTSP monitor with a Raspberry Pi 3, using this tutorial: https://community.ubnt.com/t5/UniFi-Video/Tutorial-RTSP-Raspberry-Pi-B-Viewer-6-Cam-4-Cam/td-p/1536448 TLDR: it uses the ...
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1 vote
2 answers
1k views

Why am I unable to use the framebuffer interface?

I am using the rasbperry pi 3. I am working on an embedded project. I wrote some frame buffer initialization code, which seems to work since the color palette rectangle disappears and I get a black ...
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1 vote
3 answers
3k views

3,5" Kuman display stops working after update/upgrade

I am experiencing an issue and not sure where to go from here to resolve the problem. I have purchased a Kuman 3,5" TFT screen for my Pi, installed it using the drivers and scripts from https://...
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6 votes
1 answer
10k views

gstreamer video output on pi framebuffer without X

I am running the latest Jessie image on my pi2 B. I have gstreamer-1.0 installed with gstreamer omx plugins. gst-inspect confirms the omx plugins are installed. I am not using the X server and need ...
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3 votes
1 answer
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Has anyone managed to get SDL 2/3 working, without X, in Raspbian?

I have Raspbian Jessie running on my Pi2. I am currently booting into LXDE. I want to disable X and run my SDL code directly on the framebuffer. Can someone point me to where I can find more ...
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  • 131
3 votes
1 answer
4k views

How to run X server without LXDE?

I would like to run a "naked" X server (using a framebuffer for output) on the Pi. However, startx will also start LXDE, just as startlxde and startlxde-pi do, and I cannot find a way to get around ...
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  • 141
-3 votes
2 answers
2k views

How to use I2C SSD1306 as Framebuffer [closed]

How does one make an i2c ssd1306 a framebuffer?
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1 vote
0 answers
197 views

Framebuffer over i2c

Is it possible to output a framebuffer over i2c to a ssd1306 or over ic for a screen under raspbian, for example?
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5 votes
2 answers
3k views

How to display graphical text without X using C?

Using the Raspberry Pi 2 with the official 7" touchscreen, I want to display some high quality text without using an Xorg server. I'm looking for APIs that provide simple functions such as: ...
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4 votes
2 answers
4k views

Enable 2 screens on raspberry pi2

I just got official raspberry pi lcd screen and it work perfectly. However, once the screen connected I cannot run the HDMI screen. I was looking at framebuffer and I thought there will be something ...
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  • 298
1 vote
2 answers
781 views

Raspberry pi model b waveshare spotpear 3.2 inch lcd touchscreen is not working

I'm working on a Raspberry Pi portable system and I'm using a waveshare spotpear 3.2 inch TFT LCD touch screen; I have followed the instructions on that page. I get the screen to work but not the ...
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0 votes
1 answer
1k views

fbcp reads wrong primary display resolution (RPi2)

I'm trying to use fbcp to mirror /dev/fb0 (the built in framebuffer) to /dev/fb1 however i just cannot get a picture with the native resolution of /dev/fb1 (320x240). I tried different settings in /...
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1 vote
1 answer
2k views

SSD1306 as a framebuffer with fbtft driver on a raspberry pi 2

I am facing an issue when trying to use my oled screen as a standard and simple linux framebuffer. I followed these instructions for the wiring https://learn.adafruit.com/ssd1306-oled-displays-with-...
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1 vote
2 answers
657 views

Controlling kernel interface 4DPi-32 display

I bought a a SPI controlled display 4DPi-32 [1] and compiled a kernel patched with the driver source [2] provided by the vendor (because the provided deb does not work with RPi2). I had to adapt the ...
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3 votes
2 answers
3k views

Recover Console Text Output after Using fbi App to display image on /dev/fb0

I am not using X and I'm using fbi to display an image on the /dev/fb0 framebuffer device. When I boot up my Pi, I see all the usual text and it boots up to where I can log in on the console. After I ...
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3 votes
1 answer
2k views

Watterott RPi-Display TFT no output

since a few days I'm a proud owner of a RPi Model B+ and a 2,8" RPi-Display from Watterott. HDMI output works fine, I am using a preinstalled Raspbian that boots into desktop. I followed this ...
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2 votes
2 answers
2k views

Disable bcm2708_fb, the HDMI framebuffer device

I need to disable the framebuffer running on /dev/fb0 via the bcm2708_fb kernel module (reason: some tool I use must run on /dev/fb0 and I need my small TFT to be just that - fb0). Disabling ...
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7 votes
1 answer
8k views

How can I refresh image displayed by fbi without black screen transition?

I'm using framebuffer image viewer fbi to display an image on a TV. Everything works fine for one image, if I don't refresh it. But when I need to refresh it, there is ~2 seconds of black screen (I ...
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  • 211
3 votes
1 answer
770 views

Show higher resolution on small screen (scale down)

I am using the PiTFT by Adafruit (see product page). It connects as a framebuffer device with 320x240px. I do not need to say that this is a bit low to display full web pages. Is there a way to ...
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1 vote
1 answer
8k views

Force output to different display (PiTFT)

I recently install the PiTFT on my Pi. Works great for X and I am able to have it work as a boot console. My question is how to I force an application that runs from the terminal e.g. mame, mame4all ...
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2 votes
2 answers
9k views

Display a test pattern by writing the Frame Buffer and then clear it

I'm wondering if the following is possible: I would like to display a test pattern on my Raspberry Pi and then clear it while going back to the original display. Thanks Low-Level Graphics on the ...
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