added instructions for finding Meta key on MacOS

[8alpreet]

The Issue

I had trouble using minicom because it's not obvious which keyboard key corresponds to Meta. I tried various keys such as CNTRL, CMD, & Option but nothing worked.

Solution

I found that the Meta key is ESC by running minicom in setup mode using $ minicom -s

Changes

• I created a new page called macos-meta.md
• I added a link to it at the end of nix-tooling.md

[therealprof]

Hm, minicom is not by default available on macOS. Not sure I'd recommend that to anyone these days, really.

[9names]

@therealprof what would you recommend instead?

[BartMassey]

Please rebase this to current and I'll merge it. We're getting ready to close up this version of the Discovery Book and move to https://github.com/rust-embedded/discovery-mb2 . Bigger changes should happen there.

[spookyvision]

I would probably recommend pyserial-miniterm. It's available through homebrew and has a command line option to customize the exit char (mine is mapped to Ctrl+X). Another option which comes bundled with MacOS is screen - mainly a terminal multiplexer but also has serial console capabilities.

[BartMassey]

I have a fork of scip (AKA serial-console) that I've been using on a project. scip has the advantage that if you have Rust installed you can say cargo install --locked serial-console and you should be good to go cross-platform. My fork is probably not needed for Discovery Book usage, but I should probably try to get it upstreamed anyhow…