I just would like to learn from your experience.

I have a different background, can't say I am developer but a coder who mainly do prototyping in short amount of time, and sometimes help out building microservices, backend stuffs. Go really fit the bill neatly for my job, so my first attempt jumping into the embedded world, as a hobbyist, was with TinyGo and found it completely different from userspace application development. To be honest, I did like it as a unified toolchain, but it was not yet that mature the time when I used it (I hope they are much better now) and I always had to go into the "machine" code file to find out things that should be documented better. That said, I was really happy when I got my head around multiplexed led array on the microbit, and even figured out how to drive a continuous rotation servo by timed highs and lows (TinyGo had no PWM support for microbit) for a car crusher, with an empty tissue box of course. Made my little one cry when he saw it the first time and thought his toy cars were crushed.

But when I got into more "serious" hobbyist realm, playing around with nRF52840, ESP32 and Cortex-M0, I found that Zephyr Project just feel right to me. Maybe because I am not a bare-metal magician by trade, I found the device tree concept so easy to understand and I managed to tune a DTS for ESP-EYE to use the correct address region for PSRAM, though I could only enable 4MB of it as I still couldn't understand why there are 2 separated address regions for a total 8MB of PSRAM!

By pure coincidence, IoT became the next big thing for the company I work in, so I am thinking about getting more tools in my shed. I will definitely look into CircuitPython. Never learned Python before because I just don't like it, without any objective reason I am afraid, but I reckon it is a great tool to build something really really quickly. Another language I want to learn, as you can tell, is Rust, because I can't expect my colleagues to know Zephyr when FreeRTOS is just a much more popular choice. I think one day I will have to look into FreeRTOS again but wouldn't hurt learning one more modern langauge that hopefully can do the trick easily.

However, with some initial digging, it scares me. From libraries and tutorials, one thing that bugs me is that it seems everyone has to do like Peripherals::take().unwrap() and many other long chains of method calls ending with .unwrap(). I feel like the borrow-checker is not quite ready for memory mapped IO but assumes every pointer is allocated on the heap. I just feel worried that one day they will say "okay, we actually need a different compiler for embedded, just like TinyGo for Go", and I have to relearn. Another thing that I don't know yet is, it seems not so easy to get them onto the chip? If I understand correctly, some of the nRF and ESP32 are on tier-1 support so I suppose they will be the easier choices to get started. I am interested to know from your experience what was wrong in the equation?

Thanks and my apologies for making it so long.

I think embedded Rust is simply really really new, and requires interacting with crusty C tools which is going to reduce reliability.

It's also a little fragmented with people trying different things out (e.g. Embassy vs RTIC), and different chips getting different levels of support.

Totally different experience to desktop development.