allowed suppress_end_en, changed Session_read so it won't hang when s…

…uppress_end_en==True

pyvisa_py/sessions.py

@@ -796,10 +796,9 @@ def _read(
             if current:
                 out.extend(current)
                 end_indicator_received = end_indicator_checker(current)
-                if end_indicator_received:
-                    if not suppress_end_en:
-                        # RULE 6.1.1
-                        return bytes(out), StatusCode.success
+                if end_indicator_received and not suppress_end_en:
+                    # RULE 6.1.1
+                    return bytes(out), StatusCode.success
                 else:
                     if termination_char_en and (term_char in current):
                         # RULE 6.1.2

pyvisa_py/usb.py

@@ -157,11 +157,6 @@ def _usb_reader():
 
         supress_end_en, _ = self.get_attribute(ResourceAttribute.suppress_end_enabled)
 
-        if supress_end_en:
-            raise ValueError(
-                "VI_ATTR_SUPPRESS_END_EN == True is currently unsupported by pyvisa-py"
-            )
-
         term_char, _ = self.get_attribute(ResourceAttribute.termchar)
         term_char_en, _ = self.get_attribute(ResourceAttribute.termchar_enabled)
 
@@ -306,6 +301,7 @@ def list_resources() -> List[str]:
             )
         return out
 
+
     def read(self, count: int) -> Tuple[bytes, StatusCode]:
         """Reads data from device or interface synchronously.