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I successfully installed KeDei 3.5 inch 480x320 TFT LCD on a Raspberry Pi Zero with Raspbian Buster. It works nicely as text console, especially when I use lens to magnify the view. :-)

However, I want to use it for another purpose: I would like to keep the regular screen & console output at HDMI port and use the LCD as a special-purpose peripheral.

Is there any tutorial how to set up this kind of device (TFT LCD with SPI interface) either as a serial port, or some other kind of device that would allow it to be used by a single application for special prupose, such as control panel for some communication equipment?

Or should it be sufficient to learn about KeDei's LCD protocol and write communication routines accordingly?

Thank you

P.S. Did anybody try this yet?

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