Implement std::error::Error for ErrorKinds

Author: eldruin

.github/workflows/ci.yml

@@ -19,6 +19,8 @@ jobs:
         # The default target we're compiling on and for
         TARGET: [x86_64-unknown-linux-gnu, thumbv6m-none-eabi, thumbv7m-none-eabi]
 
+        FEATURES: ["", "--features std"]
+
         include:
           # Test MSRV
           - rust: 1.40.0
@@ -40,4 +42,4 @@ jobs:
       - uses: actions-rs/cargo@v1
         with:
           command: check
-          args: --target=${{ matrix.TARGET }}
+          args: --target=${{ matrix.TARGET }} ${{ matrix.FEATURES }}

.github/workflows/test.yml

@@ -14,6 +14,7 @@ jobs:
     strategy:
       matrix:
         rust: [stable]
+        FEATURES: ["", "--features std"]
 
         include:
           - rust: 1.40.0
@@ -35,3 +36,4 @@ jobs:
       - uses: actions-rs/cargo@v1
         with:
           command: test
+          args: ${{ matrix.FEATURES }}

Cargo.toml

@@ -21,3 +21,6 @@ nb = "1"
 [dev-dependencies.stm32f1]
 version = "0.12"
 features = ["stm32f103", "rt"]
+
+[features]
+std = []

src/errors.rs

@@ -58,6 +58,9 @@ pub mod i2c {
             }
         }
     }
+
+    #[cfg(feature = "std")]
+    impl std::error::Error for ErrorKind {}
 }
 
 pub mod spi {
@@ -120,6 +123,9 @@ pub mod spi {
             }
         }
     }
+
+    #[cfg(feature = "std")]
+    impl std::error::Error for ErrorKind {}
 }
 
 pub mod serial {
@@ -177,4 +183,7 @@ pub mod serial {
             }
         }
     }
+
+    #[cfg(feature = "std")]
+    impl std::error::Error for ErrorKind {}
 }

src/lib.rs

@@ -413,7 +413,7 @@
 
 #![doc(html_root_url = "https://docs.rs/embedded-hal/1.0.0-alpha.4")]
 #![deny(missing_docs)]
-#![no_std]
+#![cfg_attr(not(feature = "std"), no_std)]
 
 pub mod blocking;
 mod errors;