Merge #23

23: Feeling crafty this week r=therealprof a=jamesmunns

Tried mixing it up with the format, as there hasn't been much shared over the last three weeks.

Let me know what you think, see a [rendered screenshot](https://screenshots.firefox.com/vgUxkv6fZIHhAOIW/127.0.0.1).

Co-authored-by: James Munns <[email protected]>

Author: bors[bot]

content/2018-10-28-newsletter-14.md

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+title = "The Embedded Working Group Newsletter - 14"
+date = 2018-10-28
+draft = false
+in_search_index = true
+template = "page.html"
++++
+
+This is the fourteenth newsletter of the [Embedded WG] where we highlight new progress, celebrate cool projects, thank the community, and advertise projects that need help!
+
+This is a special "spotlight" edition of the newsletter, where we look at a few topics in a bit more detail. Let us know what you think of the new format, and if there is anything you'd like to see included in [the next newsletter]!
+
+[Embedded WG]: https://github.com/rust-embedded/wg
+
+Discuss on [users.rust-lang.org], [on twitter], or [on reddit]!
+
+[users.rust-lang.org]: #
+[on twitter]: #
+[on reddit]: #
+[the next newsletter]: https://github.com/rust-embedded/blog/issues/22
+
+<!-- more -->
+
+## Embedded Rust Applications on Stable!
+
+<hr>
+
+<blockquote class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">Rust 1.30 is here! Proc macros, no_std binaries, and a progress bar for cargo! 🎊🎉🦀 <a href="https://t.co/IXm5xFYlhU">https://t.co/IXm5xFYlhU</a></p>&mdash; Rust Language (@rustlang) <a href="https://twitter.com/rustlang/status/1055499747056852993?ref_src=twsrc%5Etfw">October 25, 2018</a></blockquote>
+<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
+
+Now that `#[panic_handler]` is stabilized in [1.30], you can write Cortex-M bare-metal applications with the stable compiler. All our Rust Embedded crates, such as `cortex-m`, `cortex-m-rt` and `embedded-hal` should be ready to use on stable, but please note our two tutorial books [Discovery] and [The Embedded Rust Book] still require 1.30 beta or 1.31 beta as they use 2018 edition syntax (which isn't stabilized until the 1.31 release).
+
+[1.30]: https://blog.rust-lang.org/2018/10/25/Rust-1.30.0.html
+[Discovery]: https://rust-embedded.github.io/discovery/
+[The Embedded Rust Book]: https://rust-embedded.github.io/book/
+
+If you are able to trial 1.31 beta, you can help us test:
+
+* Minimal `const` functions (useful for initializing static variables)
+* 2018 edition syntax (including changes to `use` and `extern crate`)
+
+## The Newest Embedded WG Team: Cortex-A!
+
+<hr>
+
+![Screenshot of Cortex-A RFC][cortex-a-screenshot]
+
+[cortex-a-screenshot]: ../screenshot-cortex-a.png
+
+The Embedded Working Group has launched a Cortex-A team, to focus on supporting developers working on bare-metal, micro kernel, and other low-level tasks using ARM's Cortex-A series of microprocessors.
+
+The team kicked off with four members: [@andre-richter], [@parched], [@raw-bin], and [@wizofe], and have already started assembling initial [goals for their team].
+
+[goals for their team]: https://github.com/rust-embedded/wg/milestone/5
+[@andre-richter]: https://github.com/andre-richter
+[@parched]: https://github.com/parched
+[@raw-bin]: https://github.com/raw-bin
+[@wizofe]: https://github.com/wizofe
+
+
+## The Monotron Visits Rust Belt Rust
+
+<hr>
+
+<blockquote class="twitter-tweet" data-conversation="none" data-lang="en"><p lang="en" dir="ltr">Astonishing. Smashed my high score! <a href="https://t.co/WG9FXc8Kao">pic.twitter.com/WG9FXc8Kao</a></p>&mdash; Jonathan Pallant (@therealjpster) <a href="https://twitter.com/therealjpster/status/1053698944360951813?ref_src=twsrc%5Etfw">October 20, 2018</a></blockquote>
+<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
+
+[@thejpster]'s project, the [monotron], travelled to Ann Arbor Michigan for [Rust Belt Rust 2018]. Since its [last conference appearance], it has gained a whole new [list of features], including a serial application loader, a 3 channel wave table synthesizer, Atari Joystick support, and more!
+
+Check out the video above for a demo of Snake on the monotron hardware.
+
+[Rust Belt Rust 2018]: https://rust-belt-rust.com/
+[@thejpster]: https://github.com/thejpster
+[monotron]: https://github.com/thejpster/monotron
+[last conference appearance]: https://www.youtube.com/watch?v=pTEYqpcQ6lg
+[list of features]: https://twitter.com/therealjpster/status/1055187256091332608
+
+## Peripheral Ownership Woes? Not With `shared-bus`!
+
+<hr>
+
+```rust
+extern crate shared_bus;
+
+// Create your bus peripheral as usual:
+// let i2c = I2c::i2c1(dp.I2C1, (scl, sda), 90.khz(), clocks, &mut rcc.apb1);
+
+let manager = shared_bus::CortexMBusManager::new(i2c);
+
+// You can now acquire bus handles:
+let mut handle = manager.acquire();
+// handle implements `i2c::{Read, Write, WriteRead}`, depending on the
+// implementations of the underlying peripheral
+
+// Now, this works! :+1:
+let port_a = Pcf8574(manager.acquire(), 0x39).unwrap();
+let port_b = Pcf8574(manager.acquire(), 0x38).unwrap();
+```
+
+In most `embedded-hal` compatible drivers, the driver takes either ownership or a mutable reference to the peripheral used to interact with a component, such as I2C or SPI. For some protocols, such as I2C, which might have multiple devices connected to the same peripheral, managing ownership can be difficult (see [embedded-hal/35] for discussion).
+
+To address this, [@Rahix] developed [shared-bus], a crate which provides safe shared access to these peripherals through the use of a mutex. This allows for access of the underlying peripheral in as many drivers as you need! Check out the [release blog post] for more details, and for examples on how to use this for your projects.
+
+
+[@Rahix]: https://github.com/Rahix
+[embedded-hal/35]: https://github.com/rust-embedded/embedded-hal/issues/35
+[shared-bus]: https://github.com/Rahix/shared-bus
+[release blog post]: https://blog.rahix.de/001-shared-bus/
+
+## The Embedded Rust Community is Growing!
+
+<hr>
+
+<blockquote class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">Happy Tuesday! Quick poll: What are you using <a href="https://twitter.com/hashtag/embedded?src=hash&amp;ref_src=twsrc%5Etfw">#embedded</a> <a href="https://twitter.com/rustlang?ref_src=twsrc%5Etfw">@rustlang</a> for right now?<br><br>RTs appreciated!</p>&mdash; Rust Embedded Working Group (@rustembedded) <a href="https://twitter.com/rustembedded/status/1052189142065405952?ref_src=twsrc%5Etfw">October 16, 2018</a></blockquote>
+<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
+
+As we get closer to our goal of stable embedded development with Rust for the 2018 edition launch, the embedded community is ramping up. We did a quick twitter poll which received hundreds of responses, and heard from developers using or evaluating embedded rust for personal and work projects.
+
+The [Embedded WG] has also grown, starting off this year with 8 developers on a single team, to a group of **27 developers** across **11 teams**, each with their own area of focus within the embedded rust space.
+
+Now is a great time to start working with Embedded Rust, and we can't wait to see what the next year brings!
+
+## `embedded-hal` Ecosystem Crates
+
+<hr>
+
+As part of the [Weekly Driver Initiative], crates that are part of the `embedded-hal` ecosystem are now tracked in the [Awesome Embedded Rust] repository. Here is a current snapshot of what is available there:
+
+| Type                      | Status    | Count | Diff |
+| :---                      | :-----    | :---- | :--- |
+| [Device Crates]           | released  | 16    | 0    |
+| [HAL Impl Crates]         | released  | 13    | 0    |
+| [Board Support Crates]    | released  | 11    | 0    |
+| [Driver Crates Released]  | released  | 16    | +1   |
+| [Driver Crates WIP]       | WIP       | 46    | +6   |
+| [no-std crates]           | released  | 17    | +3   |
+
+[Awesome Embedded Rust]: https://github.com/rust-embedded/awesome-embedded-rust
+[Weekly Driver Initiative]: https://github.com/rust-embedded/wg/issues/39
+[Device Crates]: https://github.com/rust-embedded/awesome-embedded-rust#device-crates
+[HAL Impl Crates]: https://github.com/rust-embedded/awesome-embedded-rust#hal-implementation-crates
+[Board Support Crates]: https://github.com/rust-embedded/awesome-embedded-rust#board-support-crates
+[Driver Crates Released]: https://github.com/rust-embedded/awesome-embedded-rust#driver-crates
+[Driver Crates WIP]: https://github.com/rust-embedded/awesome-embedded-rust#wip
+[no-std crates]: https://github.com/rust-embedded/awesome-embedded-rust#no-std-crates