Started InterruptConfig type

src/lib.rs

@@ -51,3 +51,34 @@ impl MatrixConfig {
     }
 }
 
+#[derive(Clone, Copy)]
+pub struct InterruptConfig(u8);
+
+impl InterruptConfig {
+    /// A new interrupt with the following configuration:
+    /// - GPI events are tracked when keypad is locked
+    /// - Overflow data is lost
+    /// - Processor interrupt remains asserted (or low) if host tries to clear
+    ///   interrupt while there is still a pending key press, key release or
+    ///   GPI interrupt
+    /// - ~INT is not asserted if the FIFO overflows
+    /// - ~INT is not asserted after a correct unlock key sequence
+    /// - ~INT is not asserted for a change on a GPI
+    /// - ~INT is not asserted when a key event occurs
+    pub const fn new() -> Self {
+        Self(0)
+    }
+
+    pub const fn without_gpi_event_tracking_when_locked(self) -> Self {
+        InterruptConfig(self.0 | 0b0100_0000)
+    }
+
+    pub const fn with_overflow_data_shifting(self) -> Self {
+        InterruptConfig(self.0 | 0b0010_0000)
+    }
+
+    pub const fn with_temporary_interrupt_deassertion(self) -> Self {
+        InterruptConfig(self.0 | 0b0001_0000)
+    }
+}
+