stlink

It's not about the best way to behave differently at runtime and sometimes call exit depending on how the script was invoked, it's about the idea that a scripting language would SUPPORT and ENCOURAGE writing that kind of script, with a special magic built-in variable and a section in the already-complex documentation encouraging its use. Scripts should not behave differently depending on if they were invoked from other scripts, and modular reusable libraries should never take it upon themselves to call "exit" when there's an error. The way to control the flow of recursive functions is by passing explicit parameters (like the recursion depth, or a data structure to walk, or an error callback), not reflecting on the depth of the runtime stack or looking at how the function was called. If bash is too weak to handle errors, or exceptions, or

If your goal was a small hardware RNG and you don't mind spending some time hacking, then I can save you some money. Buy an ST103F development board ($1.72 shipped to US from China): https://www.aliexpress.com/item/1pcs-STM32F103C8T6-ARM-STM32... Also buy an STLink programmer for it ($1.98 shipped): https://www.aliexpress.com/item/ST-Link-V2-Programming-Unit-... Build https://github.com/texane/stlink/ or install OpenOCD. Clone the NeuG repo and build for the Maple Mini target: https://anonscm.debian.org/cgit/gnuk/gnuk/neug.git/ Now flash neug.bin to the development board via the STLink, then unplug it and plug the board into your nearest micro-USB cable. You now have a hardware RNG running the same NeuG software on the same processor family as the FST-01. This board doesn't have enough program space to run GnuK, I think. Nor is it in the

I'll second this recommandation. This kit became is my go-to choice for prototyping more complex microcontroller projects. Plenty of peripherals, flexible pin muxing, good documentation and the ARM core is quite fast. Finally, I almost forgot about the open source HW debugger to GDB bridge[0]. I actually wrote a set of drivers, libraries and a build system to allow easy prototyping (like Arduino) but also enable access to the more complex features of the SoC. [0] https://github.com/texane/stlink