My factory GD32V has a demo with 8 colors on the left edge and pen sizes that lets you draw or erase the LCD in color.
I have scoured GitHub for both this organization and at large and I cannot find the source code for it. Dumping the ROM
savebin foo3.bin 0x08000000 0x20000
I see strings that I can correlated with a couple of projects from
https://github.com/riscv-mcu/GD32VF103_Demo_Suites/tree/master/GD32VF103V_EVAL_Demo_Suites/Projects with string matches from at24cxx and a few other Gigadevice example projects like the “EXMC Touchscreen” demo, but not the whole thing. “Seeed_Arduini_LCD-TFT-GD32” appears to be a completely different project.
Not having that code or the schematics on https://wiki.seeedstudio.com/SeeedStudio-GD32-RISC-V-Dev-Board/ means I can’t tell which GPIOs control the 3 LEDs - or if they’re capable of anything but blue.
The board seems closer to the GD Eval boards (github com/riscv-mcu/GD32VF103_Demo_Suites, etc.) than the Longan Nano, but it doesn’t seem to really match either and there’s a lot of missing code and doc.
Can you please push out the buildable source to the included firmware build, the schematics so we can identify peripheral chips and locations in address space, and other relevant documentation for this board? It’s important to have the full source and not some arduino abstraction that hides all the exception handlers and boot code, etc.