I dunno if Cortex-M chips will be better for long, though. Some of the RISC-V specifications like interrupt controllers need a bit more time, but they have very

I dunno if Cortex-M chips will be better for long, though. Some of the RISC-V specifications like interrupt controllers need a bit more time, but they have very good support in mainline compilers like the GNU toolchain. My experience writing C for RISC-V MCUs is about the same as doing so for Cortex-M platforms. They're a bit low-volume/expensive atm, but the core is very appealing to chip makers because it has solid software support and no royalties. I also wouldn't write ARM off, though. Their 'coming-soon' MCU neural accelerators could open a lot of doors if it works well on a low power budget.