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Questions tagged [framebuffer]

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

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27 views

Read framebuffer and save what's on screen over SSH

Is it possible to save as an image what the Pi is currently showing on screen. I have a Pi showing images using a Python script. The Pi boots up in console and I connect to it remotely using SSH/Putty....
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16 views

Unpredictable timing with ioctl - mailboxes and double buffering

To flip the frame buffer, I am updating the mailbox virtual offset with a function like this: int flip_buffer(int buffer_num, fb_config fb0){ int fd = open("/dev/vcio",0); if(fd == -1){ ...
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1answer
74 views

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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0answers
17 views

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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0answers
64 views

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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2answers
244 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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1answer
79 views

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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0answers
145 views

Pygame initalisation for TFT on /dev/fb1 only succeeds as root

I connected a 320x240 TFT to my Raspberry Pi A+ running Raspbian stretch via SPI and set it up as fbtft_device. It shows up in /dev/fb1 and I can write images to it via pygame. I initialize it like ...
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0answers
36 views

Configuring Raspberry Pi Face Detection and Espeak

I am working with a Raspberry Pi Face Detection program and Espeak to tell that Human Face Detected. I'm using Pi Camera for face detection. The face detection program works fine. But the problem is ...
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1answer
92 views

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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1answer
379 views

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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1answer
701 views

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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2answers
583 views

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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1answer
210 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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0answers
411 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/...
4
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1answer
247 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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0answers
367 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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2answers
1k 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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2answers
915 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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3answers
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://...
3
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1answer
6k 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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1answer
9k views

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 ...
3
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1answer
3k 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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1answer
802 views

How to use I2C SSD1306 as Framebuffer

How does one make an i2c ssd1306 a framebuffer?
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0answers
141 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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2answers
1k 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: ...
4
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2answers
3k 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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2answers
663 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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1answer
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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1answer
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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2answers
628 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 ...
3
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2answers
2k 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 ...
3
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1answer
1k 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 ...
3
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1answer
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 ...
6
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1answer
7k 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 ...
2
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1answer
694 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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1answer
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 ...
2
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2answers
8k 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 ...
4
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1answer
619 views

Can I run the RPI driver in ArchLnux?

The RPI driver perports (source) to bring accelerated Xorg performance by routing X output through a frame buffer driver. The wiki page has clear instructions, but they are very specific to Raspbian, ...