FWIW they have a RISC-V based ESP32-ish microcontroller now[1]. Espressif has excellent good low-level documentation and a ton of code on Github[2]. I haven't

FWIW they have a RISC-V based ESP32-ish microcontroller now[1]. Espressif has excellent good low-level documentation and a ton of code on Github[2]. I haven't built a system up from code, but they seem as open as any microcontroller supplier without having to buy into an NDA. [1] https://hackaday.com/2021/02/08/hands-on-the-risc-v-esp32-c3-will-be-your-new-esp8266/ https://hackaday.com/2021/02/08/hands-on-the-risc-v-esp32-c3... [2] https://github.com/espressif/arduino-esp32 https://github.com/espressif/arduino-esp32