diff --git a/src/device.rs b/src/device.rs
index 7a04f5e..2ded23d 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -152,6 +152,78 @@ impl EskinDeviceInner {
     pub fn shared_transport(&self) -> SharedSerialTransport {
         Arc::clone(&self.transport)
     }
+
+
+}
+
+pub trait EskinDeviceFunc {
+    fn read_hdw_version(&mut self) -> Result<String, SdkError>;
+    fn read_matrix_row(&mut self) -> Result<u8, SdkError>;
+    fn read_matrix_col(&mut self) -> Result<u8, SdkError>;
+    fn read_device_config1(&mut self) -> Result<u8, SdkError>;
+    fn read_device_config2(&mut self) -> Result<u8, SdkError>;
+    fn write_device_config1(&mut self, enable: bool) -> Result<u16, SdkError>;
+    fn write_device_config2(&mut self, enable: bool) -> Result<u16, SdkError>;
+    fn write_matrix_row(&mut self, row: u8) -> Result<u16, SdkError>;
+    fn write_matrix_col(&mut self, col: u8) -> Result<u16, SdkError>; 
+}
+
+impl EskinDeviceFunc for EskinDeviceInner {
+    fn read_hdw_version(&mut self) -> Result<String, SdkError> {
+        let hdw = self.read_register(0, 2)
+            .map_err(|_| SdkError::FrameError("read hardware version failed".into()))?;
+
+        let version = format!("{}.{}", hdw[0], hdw[1]);
+        Ok(version)
+    }
+
+    fn read_matrix_row(&mut self) -> Result<u8, SdkError> {
+        let row = self.read_register(0x0015, 1)
+            .map_err(|_| SdkError::FrameError("read matrix row failed".into()))?;
+
+        Ok(row[0])
+    }
+
+    fn read_matrix_col(&mut self) -> Result<u8, SdkError> {
+        let col = self.read_register(0x0014, 1)
+            .map_err(|_| SdkError::FrameError("read matrix col failed".into()))?;
+
+        Ok(col[0])
+    }
+
+    fn write_matrix_row(&mut self, row: u8) -> Result<u16, SdkError> {
+        let res = self.write_register(0x0015, &[row])
+            .map_err(|_| SdkError::FrameError("write matrix row failed".into()))?;
+        Ok(res)
+    }
+
+    fn write_matrix_col(&mut self, col: u8) -> Result<u16, SdkError> {
+        let res = self.write_register(0x0015, &[col])
+            .map_err(|_| SdkError::FrameError("write matrix row failed".into()))?;
+        Ok(res)
+    }
+
+    fn read_device_config1(&mut self) -> Result<u8, SdkError> {
+        let enabled = self.read_register(0x0017, 1)
+            .map_err(|_| SdkError::FrameError("read device config1 failed".into()))?;
+        Ok(enabled[0])
+    }
+
+    fn read_device_config2(&mut self) -> Result<u8, SdkError> {
+        let enabled = self.read_register(0x0018, 1)
+            .map_err(|_| SdkError::FrameError("read device config1 failed".into()))?;
+        Ok(enabled[0])
+    }
+
+    fn write_device_config1(&mut self, enable: bool) -> Result<u16, SdkError> {
+        self.write_register(0x0017, &[u8::from(enable)])
+            .map_err(|_| SdkError::FrameError("write device config1 failed".into()))
+    }
+
+    fn write_device_config2(&mut self, enable: bool) -> Result<u16, SdkError> {
+        self.write_register(0x0018, &[u8::from(enable)])
+            .map_err(|_| SdkError::FrameError("write device config2 failed".into()))
+    }
 }
 
 pub trait EskinDevice {