[ref] format and use methods to get references

Plus, add setting keyboard support

src/misc/emulator_error.rs

@@ -18,16 +18,16 @@ pub enum EmulatorError {
     UnreachableMemory(DeviceType, u32),
     InvalidColor(u8),
     EmulatorIOError(Error),
-    OtherError(String)
+    OtherError(String),
 }
 
-impl From<TryFromSliceError> for EmulatorError{
-    fn from(value: TryFromSliceError) -> Self {
-        EmulatorError::UnreachableMemory(DeviceType::RAM,0x5a5a)
+impl From<TryFromSliceError> for EmulatorError {
+    fn from(_: TryFromSliceError) -> Self {
+        EmulatorError::UnreachableMemory(DeviceType::RAM, 0x5a5a)
     }
 }
 
-impl From<std::io::Error> for EmulatorError{
+impl From<std::io::Error> for EmulatorError {
     fn from(value: Error) -> Self {
         EmulatorIOError(value)
     }

src/misc/endian.rs

@@ -10,4 +10,8 @@ pub fn read_big_endian_u16(input: &[u8; 2]) -> u16 {
 /// Write 24-bit endian number into slice
 pub fn write_big_endian_u24(input: u32, output_slice: &mut [u8; 3]) {
     BigEndian::write_u24(output_slice, input);
+}
+
+pub fn write_big_endian_u16(input: u16, output_slice: &mut [u8; 2]) {
+    BigEndian::write_u16(output_slice, input);
 }