The DSO Nano V3 is a cheap open-source (both hardware and software) oscilloscope by Seeed Studios that runs on a STM32F1.
Using an STLink device, it can be freely reprogrammed. I made a Snake game that runs on it in C using the STM32CubeIDE.
I had to write a little screen driver for the screen it embeds. This project is my first true embedded project.
