Interfacing (DSI, CSI, I2C, etc.) • DPI Display with touch on GPIO Questions

Hello, I want to use a Touchscreen with DPI interface over the GPIO pins for a handheld project with the Raspberry Pi Zero.
The display I want to use is this: https://www.buydisplay.com/bar-type-2-8 ... -7vXWc9R0-
I only want to run it in RGB565 to save some pins.
The Touch Interface is using I2C.
I know the Waveshare 2.8inch DPI LCD is similar, so I want to follow its pinout minus the the extra pins for RGB666.
But here is my first question: Is the I2C bitbanged in software?
When I looked the pins up there is no I2C on these. Did I missed something?
I want to have a qwerty keyboard with the TCA8418 over the same I2C like the touchscreen and really like to use hardware I2C instead of bitbang I2C.
I also need a pin for Sound, simple PWM and mono is all I want, everything above is nice to have.
I was thinking to use the Pin, that at the Waveshare Display is used to regulate for brightness for PWM Sound.
That would cover (Mono) Sound or do I overlook something and I need additional pins?
The rest of the GPIOs Pins will be used for communication with a MCU which will also controll the brightens of the display.

Statistics: Posted by DocRaptor — Mon May 05, 2025 7:44 pm

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