return None if data returned is empty

diff --git a/src/soc/debug/jtagutils.py b/src/soc/debug/jtagutils.py
index a642bd1f358cbab7f639505a3f5475ec0625ae7c..79418e28ed27c88037fac58268e758f2aedfacbc 100644 (file)
--- a/src/soc/debug/jtagutils.py
+++ b/src/soc/debug/jtagutils.py
@@ -157,7 +157,7 @@ class JTAGServer:
 
     def jtagremote_server_recv(self, tdo):
         data = self.get_data(1, 0) # read 1 byte, non-blocking
-        if data is None:
+        if data is None or len(data) == 0:
             return None # no data read
         data = bytes.decode(data)
         if self.debug: