[inferiorhuman]

Mostly I'm just leery of software defined peripherals being at the mercy of whatever community springs up around them, nothing specific. In terms of a Metro then yeah, something to slot in where the Due was absolutely with high speed USB, 10/100 ethernet, CAN FD, and all that jazz that wouldn't work on a $10 board. A SAMV70 successor to the Due?

NXP just seems antithetical to an open platform. Then again Arduino went with Renesas, and they're… not great.

Otherwise it's the openness that would pique my interest. SWD headers, yes 100%. But also the documentation. No half-assed SVDs, buggy closed source flash algorithms (Microchip), wholly undocumented peripherals (looking at you Renesas), stuff like that.

[jacquesm]

All chip manufacturers are alike in this respect, unfortunately. That whole industry believes that they thrive on secrecy and that simply properly speccing their hardware would already be a massive competitive risk.

[inferiorhuman]

Nah, it's a spectrum. Companies like NXP and Infineon are at one end. NXP wants a ton of personal information to access even the most basic docs on some of its chips, sometimes even an NDA. Infineon won't even acknowledge you for the most part.

Companies like STM, RP, and TI are at the other end. STM got super popular because they're cheap and the documentation is incredibly easy to get at. I think RP is following suit.

Renesas puts out some documentation, but it's really rough. Anything that has even a whiff of crypto is completely undocumented. They're also squatting on a few Rust crates where Espressif actually hired a Rust developer to work on their Rust HAL. The most comical thing is that while they version their reference manual they don't seem to update it and instead issue a ton of broad errata that apply to multiple manuals.

Before the acquisition Atmel's documentation was well written and organized.