SPI: split into device/bus, allows sharing buses with automatic CS management.

Co-authored-by: Diego Barrios Romero <[email protected]>

Author: Dirbaio

.github/bors.toml

@@ -5,8 +5,8 @@ status = [
   "ci-linux (stable, x86_64-unknown-linux-gnu)",
   "ci-linux (stable, thumbv6m-none-eabi)",
   "ci-linux (stable, thumbv7m-none-eabi)",
-  "ci-linux (1.46.0, x86_64-unknown-linux-gnu)",
+  "ci-linux (1.54.0, x86_64-unknown-linux-gnu)",
   "ci-linux-test (stable)",
-  "ci-linux-test (1.46.0, x86_64-unknown-linux-gnu)",
+  "ci-linux-test (1.54.0, x86_64-unknown-linux-gnu)",
   "fmt",
 ]

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
 
         include:
           # Test MSRV
-          - rust: 1.46.0
+          - rust: 1.54.0
             TARGET: x86_64-unknown-linux-gnu
 
           # Test nightly but don't fail

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
         rust: [stable]
 
         include:
-          - rust: 1.46.0
+          - rust: 1.54.0
             TARGET: x86_64-unknown-linux-gnu
 
           # Test nightly but don't fail

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Changed
+- The Minimum Supported Rust Version (MSRV) is now 1.54.0
+- `spi`: unify all traits into `SpiReadBus`, `SpiWriteBus` and `SpiBus` (read-write).
+- `spi`: Add `SpiDevice` trait to represent a single device in a (possibly shared) bus, with managed chip-select (CS) pin.
+
 ## [v1.0.0-alpha.7] - 2022-02-09
 
 *** This is (also) an alpha release with breaking changes (sorry) ***

README.md

@@ -1,7 +1,7 @@
 [![crates.io](https://img.shields.io/crates/d/embedded-hal.svg)](https://crates.io/crates/embedded-hal)
 [![crates.io](https://img.shields.io/crates/v/embedded-hal.svg)](https://crates.io/crates/embedded-hal)
 [![Documentation](https://docs.rs/embedded-hal/badge.svg)](https://docs.rs/embedded-hal)
-![Minimum Supported Rust Version](https://img.shields.io/badge/rustc-1.46+-blue.svg)
+![Minimum Supported Rust Version](https://img.shields.io/badge/rustc-1.54+-blue.svg)
 
 # `embedded-hal`
 
@@ -98,7 +98,7 @@ Because of this we only aim to support the latest `-alpha`.
 
 ## Minimum Supported Rust Version (MSRV)
 
-This crate is guaranteed to compile on stable Rust 1.46 and up. It *might*
+This crate is guaranteed to compile on stable Rust 1.54 and up. It *might*
 compile with older versions but that may change in any new patch release.
 
 ## License