Merge #182

182: README.md: Add samd51, accelerometer crate, micromath crate r=andre-richter a=tarcieri

- Adds a link to `samd51` in addition to `samd21`, and updates the project's location
- Adds a new "Component abstraction crates" section and lists the `accelerometer` crate
- Adds the `micromath` crate to the "no-std crates" section

Co-authored-by: Tony Arcieri <[email protected]>

Author: bors[bot]

README.md

@@ -45,6 +45,7 @@ This project is developed and maintained by the [Resources team][team].
     * [STMicroelectronics](#stmicroelectronics-2)
     * [Texas Instruments](#texas-instruments-2)
     * [Special Purpose](#special-purpose)
+* [Component abstraction crates](#component-abstraction-crates)
 * [Driver crates](#driver-crates)
     * [WIP](#wip)
 * [no-std crates](#no-std-crates)
@@ -117,7 +118,8 @@ Peripheral Access Crates were also called Device Crates.
 
 ### Microchip
 
-- [`atsamd21`](https://github.com/wez/atsamd21-rs) Peripheral access API for Microchip (formerly Atmel) SAMD21 microcontrollers.  This git repo hosts both the peripheral access crate and the hal.
+- [`atsamd21`](https://github.com/atsamd-rs/atsamd) Peripheral access API for Microchip (formerly Atmel) SAMD21 microcontrollers.  This git repo hosts both the peripheral access crate and the hal.
+- [`atsamd51`](https://github.com/atsamd-rs/atsamd) Peripheral access API for Microchip (formerly Atmel) SAMD51 microcontrollers.  This git repo hosts both the peripheral access crate and the hal.
 - [`sam3x8e`](https://crates.io/crates/sam3x8e) Peripheral access API for Atmel SAMD3X8E microcontrollers (generated using svd2rust)  - ![crates.io](https://img.shields.io/crates/v/sam3x8e.svg)
 
 ### Nordic
@@ -176,6 +178,10 @@ Implementations of [`embedded-hal`] for microcontroller families and systems run
 [`linux-embedded-hal`]: https://crates.io/crates/linux-embedded-hal
 [`ftdi-embedded-hal`]: https://github.com/geomatsi/ftdi-embedded-hal
 
+### Microchip
+
+- [`atsamd-hal`](https://crates.io/crates/atsamd-hal) - HAL for SAMD21 and SAMD51 - ![crates.io](https://img.shields.io/crates/v/atsamd-hal.svg)
+
 ### Nordic
 
 - [`nrf51-hal`](https://crates.io/crates/nrf51-hal) - ![crates.io](https://img.shields.io/crates/v/nrf51-hal.svg)
@@ -277,6 +283,12 @@ Crates tailored for specific boards.
 [STM32F4DISCOVERY]: https://www.st.com/en/evaluation-tools/stm32f4discovery.html
 [STM32F429DISCOVERY]: https://www.st.com/en/evaluation-tools/32f429idiscovery.html
 
+### Adafruit
+
+- [`metro_m4`](https://crates.io/crates/metro_m4) - ![crates.io](https://img.shields.io/crates/v/metro_m4.svg)
+- [`pyportal`](https://crates.io/crates/pyportal) - ![crates.io](https://img.shields.io/crates/v/pyportal.svg)
+- [`trellis_m4`](https://crates.io/crates/trellis_m4) - ![crates.io](https://img.shields.io/crates/v/trellis_m4.svg)
+
 ### Nordic
 
 - [`dwm1001`](https://crates.io/crates/dwm1001) - [Decawave DWM1001-DEV] - ![crates.io](https://img.shields.io/crates/v/dwm1001.svg)
@@ -317,6 +329,15 @@ Crates tailored for specific boards.
 
 - [`betafpv-f3`](https://github.com/JoshMcguigan/betafpv-f3) - For the BetaFPV F3 drone flight controller
 
+## Component abstraction crates
+
+The following crates provide HAL-like abstractions for subcomponents of embedded
+devices which go beyond what is available in [`embedded-hal`]:
+
+- [`accelerometer`](https://github.com/NeoBirth/accelerometer.rs) - Generic accelerometer support, including traits and types for taking readings from 2 or 3-axis accelerometers and tracking device orientations - ![crates.io](https://img.shields.io/crates/v/accelerometer.svg)
+- [`embedded-graphics`](https://crates.io/crates/embedded-graphics): 2D drawing library for any size display - ![crates.io](https://img.shields.io/crates/v/embedded-graphics.svg)
+- [`smart-leds`](https://github.com/smart-leds-rs): Support for addressable LEDs including WS2812 and APA102
+
 ## Driver crates
 
 Platform agnostic crates to interface external components. These crates use the [`embedded-hal`]
@@ -572,21 +593,20 @@ Work in progress drivers. Help the authors make these crates awesome!
 - [bluetooth-hci](https://crates.io/crates/bluetooth-hci): device-independent Bluetooth Host-Controller Interface implementation. ![crates.io](https://img.shields.io/crates/v/bluetooth-hci.svg)
 - [combine](https://crates.io/crates/combine): parser combinator library - ![crates.io](https://img.shields.io/crates/v/combine.svg)
 - [console-traits](https://github.com/thejpster/console-traits): Describes a basic text console. Used by [menu] and implemented by [vga-framebuffer]. ![crates.io](https://img.shields.io/crates/v/console-tratis.svg)
-- [embedded-graphics](https://crates.io/crates/embedded-graphics): 2D drawing library for any size display - ![crates.io](https://img.shields.io/crates/v/embedded-graphics.svg)
 - [tinybmp](https://crates.io/crates/tinybmp): No-std, no-alloc BMP parser for embedded systems. [Introductory blog post](https://wapl.es/rust/2019/03/04/embedded-graphics-0.4.7-bmp-support.html) - ![crates.io](https://img.shields.io/crates/v/tinybmp.svg)
 - [heapless](https://crates.io/crates/heapless): provides `Vec`, `String`, `LinearMap`, `RingBuffer` backed by fixed-size buffers  - ![crates.io](https://img.shields.io/crates/v/heapless.svg)
 - [ieee802154](https://crates.io/crates/ieee802154): Partial implementation of the IEEE 802.15.4 standard - ![crates.io](https://img.shields.io/crates/v/ieee802154.svg)
 - [intrusive-collections](https://crates.io/crates/intrusive-collections): intrusive (non-allocating) singly/doubly linked lists and red-black trees - ![crates.io](https://img.shields.io/crates/v/intrusive-collections.svg)
 - [managed](https://crates.io/crates/managed): provides `ManagedSlice`, `ManagedMap` backed by either their std counterparts or fixed-size buffers for `#![no_std]`. - ![crates.io](https://img.shields.io/crates/v/managed.svg)
 - [menu]: A basic command-line interface library. Has nested menus and basic help functionality. ![crates.io](https://img.shields.io/crates/v/menu.svg)
+- [micromath](https://github.com/NeoBirth/micromath): Embedded Rust math library featuring fast, safe floating point approximations for common arithmetic operations, 2D and 3D vector types, and statistical analysis - ![crates.io](https://img.shields.io/crates/v/micromath.svg)
 - [nalgebra](https://crates.io/crates/nalgebra): general-purpose and low-dimensional linear algebra library - ![crates.io](https://img.shields.io/crates/v/nalgebra.svg)
 - [nom](https://crates.io/crates/nom): parser combinator framework - ![crates.io](https://img.shields.io/crates/v/nom.svg)
 - [num-format](https://crates.io/crates/num-format): Crate for producing string representations of numbers, formatted according to international standards, e.g. "1,000,000" for US English - ![crates.io](https://img.shields.io/crates/v/num-format.svg)
 - [pc-keyboard]: A PS/2 keyboard protocol driver. Transport (bit-banging or SPI) agnostic, but can convert Set 2 Scancodes into Unicode. ![crates.io](https://img.shields.io/crates/v/pc-keyboard.svg)
 - [qei](https://crates.io/crates/qei) : A qei wrapper that allows you to extend your qei timers from a 16 bit integer to a 64 bit integer. - ![crates.io](https://img.shields.io/crates/v/qei.svg)
 - [register-rs](https://github.com/rust-osdev/register-rs): Unified interface for MMIO and CPU registers. Provides type-safe bitfield manipulation. - ![crates.io](https://img.shields.io/crates/v/register.svg)
 - [scroll](https://crates.io/crates/scroll): extensible and endian-aware Read/Write traits for generic containers - ![crates.io](https://img.shields.io/crates/v/scroll.svg)
-- [smart-leds-rs](https://github.com/smart-leds-rs): Organization for addressable LEDs including WS2812 and APA102
 - [smoltcp](https://github.com/m-labs/smoltcp): a small TCP/IP stack that runs without `alloc`. ![crates.io](https://img.shields.io/crates/v/smoltcp.svg)
 - [vga-framebuffer]: A VGA signal generator and font renderer for VGA-less microcontrollers. Used by [Monotron](https://github.com/thejpster/monotron) to generate 48 by 36 character display using 3 SPI peripherals and a timer. ![crates.io](https://img.shields.io/crates/v/vga-framebuffer.svg)
 - [dcmimu]: An algorithm for fusing low-cost triaxial MEMS gyroscope and accelerometer measurements ![crates.io](https://img.shields.io/crates/v/dcmimu.svg)