Here's a video of my game emulator running with my SPI code on the Duo and ili9341. This is a recent Armbian build for the Orange Pi Zero instead of the awful build shipped by FriendlyElec.

https://www.youtube.com/watch?v=jYbecorQj1E

I tried booting the NanoPi Duo with a mainline (4.11) Linux build for Orange Pi Zero (same CPU). The SPI speed is fine, so it's purely a software problem on the part of FriendlyElec's Linux build.

I would like to get composite video working on the NanoPi Duo. I was able to see it working by booting an OrangePi Zero sdcard. It overheated and hung after a few minutes, but the video output worked fine. Does anyone know how to configure FriendlyElec's Linux build to enable video out?

I've been testing the NanoPi Duo with the included Ubuntu build. For some reason, the SPI can only achieve about 3Mhz (based on my observed ili9341 LCD refresh rate). Other H2+ boards can normally go as high as 33Mhz (~30FPS update). Anyone else seeing this issue?

The button is accessible as a standard GPIO input on GPIO355. It can be accessed with the sysfs driver (/sys/class/gpio).