fix parser

tests/test_sweep_parser_core.py

@@ -175,6 +175,34 @@ class SweepParserCoreTests(unittest.TestCase):
         self.assertEqual(events[4].x, 1)
         self.assertEqual(events[4].aux, (120.0, 80.0))
 
+    def test_legacy_binary_parser_tty_mode_does_not_flip_to_legacy_on_ch2_low_byte_0x0a(self):
+        parser = LegacyBinaryParser()
+        stream = b"".join(
+            [
+                _pack_tty_start(),
+                _pack_tty_point(1, 100, 0x040A),  # low byte is 0x0A: used to be misparsed as legacy
+                _pack_tty_point(2, 120, 0x0410),
+            ]
+        )
+
+        events = parser.feed(stream)
+
+        self.assertEqual(len(events), 3)
+        self.assertIsInstance(events[0], StartEvent)
+        self.assertEqual(events[0].ch, 0)
+
+        self.assertIsInstance(events[1], PointEvent)
+        self.assertEqual(events[1].ch, 0)
+        self.assertEqual(events[1].x, 1)
+        self.assertEqual(events[1].aux, (100.0, 1034.0))
+        self.assertEqual(events[1].y, 934.0)
+
+        self.assertIsInstance(events[2], PointEvent)
+        self.assertEqual(events[2].ch, 0)
+        self.assertEqual(events[2].x, 2)
+        self.assertEqual(events[2].aux, (120.0, 1040.0))
+        self.assertEqual(events[2].y, 920.0)
+
     def test_complex_ascii_parser_detects_new_sweep_on_step_reset(self):
         parser = ComplexAsciiSweepParser()
         events = parser.feed(b"0 3 4\n1 5 12\n0 8 15\n")