diff --git a/artiq/dashboard/waveform.py b/artiq/dashboard/waveform.py
index 141e4908d..10b56ddb1 100644
--- a/artiq/dashboard/waveform.py
+++ b/artiq/dashboard/waveform.py
@@ -751,29 +751,14 @@ class WaveformDock(QtWidgets.QDockWidget):
                 "value": (0, "log")
             })
 
-    def on_dump_receive(self, *args):
-        header = comm_analyzer.decode_header_from_receiver(*args)
-        decoded_dump = comm_analyzer.decode_dump_loop(*header)
+    def on_dump_receive(self, data):
+        decoded_dump = comm_analyzer.decode_dump(data)
         ddb = self._ddb
         trace = comm_analyzer.decoded_dump_to_waveform_data(ddb, decoded_dump)
         self._state.update(trace)
         self._dump = args
         self.traceDataChanged.emit()
 
-    def on_dump_read(self, dump):
-        endian_byte = dump[0]
-        if endian_byte == ord("E"):
-            endian = '>'
-        elif endian_byte == ord("e"):
-            endian = '<'
-        else:
-            logger.warning("first byte is not endian")
-            raise ValueError
-        payload_length_word = dump[1:5]
-        payload_length = struct.unpack(endian + "I", payload_length_word)[0]
-        data = dump[5:]
-        self.on_dump_receive(endian, payload_length, data)
-
     def _decode_dump(self):
         dump = self._dump
         header = comm_analyzer.decode_header_from_receiver(*dump)
@@ -800,7 +785,7 @@ class WaveformDock(QtWidgets.QDockWidget):
         try:
             with open(filename, 'rb') as f:
                 dump = f.read()
-            self.on_dump_read(dump)
+            self.on_dump_receive(dump)
         except Exception as e:
             logger.error("Failed to open analyzer trace: %s", e)