impl core::error::Error for EspError (#402)

* `impl core::error::Error for EspError`

* Update CHANGELOG.md

* Add `no_std` gate to core impl

* Remove `std::error::Error`

* Bump MSRV to 1.82

Author: owenthewizard

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support for `esp32c5` and `esp32c61`
 - Add raw bindings for `esp_lcd_mipi_dsi.h` and `esp_ldo_regulator.h` (#398)
 - Pulse counter bindings for esp32p4
+- `impl core::error::Error for EspError`
 
 ### Fixed
 - Fix the `esp_app_desc!` macro so the reserv3 field is correct for ESP IDF v5.4

Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 links = "esp_idf"
 build = "build/build.rs"
 documentation = "https://docs.esp-rs.org/esp-idf-sys/"
-rust-version = "1.66"
+rust-version = "1.82"
 
 [lib]
 harness = false

src/error.rs

@@ -72,8 +72,7 @@ impl EspError {
     }
 }
 
-#[cfg(feature = "std")]
-impl std::error::Error for EspError {}
+impl core::error::Error for EspError {}
 
 impl fmt::Display for EspError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {