Questions tagged [framebuffer]

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

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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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2answers
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 ...
1
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2answers
265 views

Writing to framebuffer on C is very slow (Raspberry Pi)

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 ...
1
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0answers
60 views

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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0answers
20 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
253 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 ...
1
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0answers
751 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/...
1
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0answers
525 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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0answers
194 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?
1
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2answers
759 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 ...
1
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2answers
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 ...
0
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0answers
17 views

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: ...
0
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1answer
75 views

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 ...
0
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0answers
48 views

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 ...
0
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0answers
78 views

Test TFT SPI ILI9341 display via startx & con2fbmap showing console

I have a 2.4" TFT LCD 240x320 Serial SPI (ILI9341 driver) that I am unsuccessfully trying to use with Raspberry Pi 4B and the Adafruit_blinka library having executed the necessary pre-requisites (...
0
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0answers
66 views

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.
0
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0answers
114 views

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 ...
0
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0answers
35 views

Raspberry does not respect Framebuffer resolution after latest update (dez 2020) and changes mid-boot

I have the following on my /boot/config.txt: framebuffer_width=1280 framebuffer_height=720 Which worked for many years on my dozens Raspberry Pis until I updated Raspbian 10.6 this week. Now, it ...