Bought some very cheap second hand #eink tags. Based on other people's observation the display is GDEH0213Z98. The #MCU on board is Unicmicro's UM3213, and fortunately the SDK and datasheet can be found on the company's website.

The SDK only supports Keil MDK. I made Gemini write a startup.s and a linker script for GCC based on the MDK files. Then I wrote a #PyOCD target (since they only provide a .FLM flash algorithm), some Makefiles and it works!

https://github.com/chuangzhu/um3213-sdk-gcc/tree/epd/Driver%26Example/gpio/demo

I've been working on reediting some of the wallpapers I made from #manga panels, especially the fine lines of Yokohama Kaidashi Kikou, that needed to be a little thicker to be appreciated on the display of my #XteinkX4, pretty happy with the result! I used #GIMP for this, of course

#wallpaper #eink #xteink

I love all the hacking taking place for e-ink readers https://github.com/iandchasse/de-link/tree/main

#ereader #eink #xtreader #diypcb

https://trmnl.com/developers

You can use your own devices to run TRML.

If you'd rather roll your own ePaper hardware, BYOD is for you. Combine our open-source firmware with your custom PCB or off-the-shelf microcontroller to create a TRMNL-like experience. It's not the most cost-effective route, but it's the ultimate way to scratch that DIY itch and learn the inner workings of ePaper dashboards.

My new EReader: an XTeink X4. Cheap, small, and works great if you replace the stock firmware. Here it is for scale, installed in my Traveler’s Notebook with a mag connector that comes with the unit. Yes, that’s a Traveler’s fountain pen.

#eink #books #fountainpen