driver: add get_hw_rev() fn

pykirdy/driver/kirdy.py

@@ -26,6 +26,7 @@ class CmdList:
         SetPdFinGain = _dt.f32
         SetPdTransconductance = _dt.f32
         SetActiveReportMode = _dt.bool
+        GetHwRev = _dt.none
         GetStatusReport = _dt.none
         GetSettingsSummary = _dt.none
         Dfu = _dt.none
@@ -208,6 +209,20 @@ class Device:
         """
         return await self._send_cmd(self._cmd._target, self._cmd.SetPdTransconductance, transconductance)
 
+    async def get_hw_rev(self):
+        """
+            Get hardware revision of the connected Kirdy
+
+            {
+                'msg_type': 'HwRev', 
+                'hw_rev': {
+                    'major': 0, 
+                    'minor': 3
+                }
+            }
+        """
+        return await self._send_cmd(self._cmd._target, self._cmd.GetHwRev, msg_type="HwRev")
+
     async def get_status_report(self, sig=None):
         """
             Get status of all peripherals in a json object.