Add Interface trait

src/lib.rs

@@ -13,6 +13,24 @@ use hal::spi::{Mode, Phase, Polarity};
 use core::fmt::Debug;
 use core::iter::IntoIterator;
 
+/// Trait representing the interface to the hardware.
+///
+/// Intended to abstract the various buses (SPI, MPU 8/9/16-bit) from the Controller code.
+pub trait Interface {
+    type Error;
+
+    /// Sends a command with a sequence of 8-bit arguments
+    ///
+    /// Mostly used for sending configuration commands
+    fn write(&mut self, command: u8, data: &[u8]) -> Result<(), Self::Error>;
+
+    /// Sends a command with a sequence of 16-bit data words
+    ///
+    /// Mostly used for sending MemoryWrite command and other commands
+    /// with 16-bit arguments
+    fn write_iter(&mut self, command: u8, data: impl IntoIterator<Item = u16>) -> Result<(), Self::Error>;
+}
+
 /// SPI mode
 pub const MODE: Mode = Mode {
     polarity: Polarity::IdleLow,