Add idle function.

Useful to lower power draw when running on a Desktop App.

Author: jonathanpallant

README.md

@@ -47,6 +47,8 @@ dual licensed as above, without any additional terms or conditions.
 * Add `bus_interrupt_status`
 * Remove `delay`
 * Add back in the `block_XXX` API for reading/writing Block Devices.
+* Add idle function.
+* `memory_get_region` returns `Option`, not `Result`
 
 ### v0.6.1
 

src/lib.rs

@@ -579,6 +579,15 @@ pub struct Api {
 		num_blocks: u8,
 		data: ApiByteSlice,
 	) -> crate::Result<()>,
+
+	// ========================================================================
+	// Power management functions
+	// ========================================================================
+	/// The OS will call this function when it's idle.
+	///
+	/// On a microcontroller, this will wait for interrupts. Running in an
+	/// emulator, this will sleep the thread for a while.
+	pub power_idle: extern "C" fn(),
 }
 
 // ============================================================================