// Zinc, the bare metal stack for rust.
// Copyright 2014 Vladimir "farcaller" Pouzanov <farcaller@gmail.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/// GPIO direction.
pub enum GPIODirection {
  /// Input mode
  In,
  /// Output mode
  Out,
}

/// Logic levels.
#[deriving(PartialEq)]
pub enum GPIOLevel {
  /// Logic low
  Low,
  /// Logic high
  High,
}

/// General Purpose I/O
pub trait GPIO {
  /// Set to logic high
  fn set_high(&self);

  /// Set to logic low
  fn set_low(&self);

  /// Read current logic level
  fn level(&self) -> GPIOLevel;

  /// Set direction mode to `In` or `Out`,
  /// for reading or writing respectively
  fn set_direction(&self, new_mode: GPIODirection);
}

// Zinc, the bare metal stack for rust.
// Copyright 2014 Vladimir "farcaller" Pouzanov <farcaller@gmail.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/// GPIO direction.
pub enum GPIODirection {
  In,
  Out,
}

/// Logic levels.
#[deriving(PartialEq)]
pub enum GPIOLevel {
  Low,
  High,
}

/// General Purpose I/O
pub trait GPIO {
  /// Set to logic high
  fn set_high(&self);

  /// Set to logic low
  fn set_low(&self);

  /// Read current logic level
  fn level(&self) -> GPIOLevel;

  /// Set directio to `Low` or `High`
  fn set_direction(&self, new_mode: GPIODirection);
}

--- 
+++ 
@@ -15,14 +15,18 @@
 
 /// GPIO direction.
 pub enum GPIODirection {
+  /// Input mode
   In,
+  /// Output mode
   Out,
 }
 
 /// Logic levels.
 #[deriving(PartialEq)]
 pub enum GPIOLevel {
+  /// Logic low
   Low,
+  /// Logic high
   High,
 }
 
@@ -37,6 +41,7 @@
   /// Read current logic level
   fn level(&self) -> GPIOLevel;
 
-  /// Set directio to `Low` or `High`
+  /// Set direction mode to `In` or `Out`,
+  /// for reading or writing respectively
   fn set_direction(&self, new_mode: GPIODirection);
 }
Document each variant of GPIOLevel and GPIODirection
