waveform: add save_vcd

artiq/dashboard/waveform.py

@@ -11,7 +11,7 @@ from sipyco.pc_rpc import AsyncioClient
 from artiq.tools import exc_to_warning
 from artiq.coredevice import comm_analyzer
 from artiq.coredevice.comm_analyzer import WaveformType
-from artiq.gui.tools import LayoutWidget, get_open_file_name
+from artiq.gui.tools import LayoutWidget, get_open_file_name, get_save_file_name
 from artiq.gui.models import DictSyncTreeSepModel, LocalModelManager
 
 
@@ -267,6 +267,7 @@ class WaveformDock(QtWidgets.QDockWidget):
         self._file_menu = QtWidgets.QMenu()
         self._add_async_action("Open trace...", self.load_trace)
         self._add_async_action("Save trace...", self.save_trace)
+        self._add_async_action("Save trace as VCD...", self.save_vcd)
         self._menu_btn.setMenu(self._file_menu)
 
     def _add_async_action(self, label, coro):
@@ -338,6 +339,27 @@ class WaveformDock(QtWidgets.QDockWidget):
         except:
             logger.error("Failed to save analyzer trace", exc_info=True)
 
+    async def save_vcd(self):
+        if self._dump is None:
+            logger.error("No analyzer trace stored in dashboard, "
+                         "try loading from file or fetching from device")
+            return
+        try:
+            filename = await get_save_file_name(
+                self,
+                "Save VCD",
+                self._current_dir,
+                "All files (*.*)")
+        except asyncio.CancelledError:
+            return
+        self._current_dir = os.path.dirname(filename)
+        try:
+            decoded_dump = comm_analyzer.decode_dump(self._dump)
+            with open(filename, 'w') as f:
+                comm_analyzer.decoded_dump_to_vcd(f, self._ddb, decoded_dump)
+        except:
+            logger.error("Failed to save trace as VCD", exc_info=True)
+
     def _process_ddb(self):
         channel_list = comm_analyzer.get_channel_list(self._ddb)
         self._channel_model.clear()