Auto merge of rust-embedded#36 - thejpster:input_pin, r=japaric

Add InputPin trait

I needed a basic InputPin trait for the buttons on my Stellaris Launchpad.

Author: homunkulus

Cargo.toml

@@ -1,13 +1,16 @@
 [package]
-authors = ["Jorge Aparicio <[email protected]>"]
+authors = [
+	"Jorge Aparicio <[email protected]>",
+	"Jonathan 'theJPster' Pallant <[email protected]>"
+]
 categories = ["asynchronous", "embedded", "hardware-support", "no-std"]
 description = " A Hardware Abstraction Layer (HAL) for embedded systems "
 documentation = "https://docs.rs/embedded-hal"
 keywords = ["hal", "IO"]
 license = "MIT OR Apache-2.0"
 name = "embedded-hal"
 repository = "https://github.com/japaric/embedded-hal"
-version = "0.1.0"
+version = "0.1.1"
 
 [dependencies.nb]
 version = "0.1.1"

src/digital.rs

@@ -14,3 +14,12 @@ pub trait OutputPin {
     /// Sets the pin high
     fn set_high(&mut self);
 }
+
+/// Single digital input pin
+pub trait InputPin {
+    /// Is the input pin high?
+    fn is_high(&self) -> bool;
+
+    /// Is the input pin low?
+    fn is_low(&self) -> bool;
+}

src/prelude.rs

@@ -14,6 +14,7 @@ pub use ::timer::CountDown as _embedded_hal_timer_CountDown;
 pub use ::blocking::delay::DelayMs as _embedded_hal_blocking_delay_DelayMs;
 pub use ::blocking::delay::DelayUs as _embedded_hal_blocking_delay_DelayUs;
 pub use ::digital::OutputPin as _embedded_hal_digital_OutputPin;
+pub use ::digital::InputPin as _embedded_hal_digital_InputPin;
 pub use ::serial::Read as _embedded_hal_serial_Read;
 pub use ::serial::Write as _embedded_hal_serial_Write;
 pub use ::spi::FullDuplex as _embedded_hal_spi_FullDuplex;