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PiTFT 3.5 as raw framebuffer with buster - headless
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PiTFT 3.5 as raw framebuffer with buster - headless

by dr_donkey on Sat Jan 11, 2020 8:28 pm

PiTFT 3.5 as raw framebuffer with buster - headless?
by dr_donkey on Sat Jan 11, 2020 11:55 pm

How can I use the Piftf as a raw framebuffer, showing only the output of eg a python script, but not the full desktop,
while working on the desktop via a headless setup through vnc?
Other than the pitft, there is no physical monitor connected via HDMI, there is only the VNC session

I am using the PiTFT plus 480x320 3.5 in combination with a Pi 4, with a clean version of the latest buster image.
I select legacy mode, disabling the GL driver, in raspi-config
Then I run the installer script
when it asks to mirror HDMI, I answer no

After re-boot, the pitft shows a full desktop (where I had expected it to stay black)
I only have /dev/fb0, cannot seem to make a /dev/fb1 with framebuffer=/dev/fb1 startx

How can I send only specific output to the pitft, rather than the full desktop?

Thanks for any help

dr_donkey
 
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Joined: Sat Jan 11, 2020 6:40 pm

Please be positive and constructive with your questions and comments.