software/litescope_cli: set default length to None (do a capture with…

… max depth).

litescope/software/driver/analyzer.py

@@ -99,7 +99,7 @@ def configure_trigger(self, value=0, mask=0, cond=None):
     def configure_subsampler(self, value):
         self.subsampler_value.write(value-1)
 
-    def run(self, offset = 0, length = None):
+    def run(self, offset=0, length=None):
         if length is None:
             length = self.depth
         assert offset < self.depth

litescope/software/litescope_cli.py

@@ -64,7 +64,7 @@ def parse_args():
     parser.add_argument("-l", "--list",          action="store_true",      help="List signal choices")
     parser.add_argument("--subsampling",         default="1",              help="Capture Subsampling.")
     parser.add_argument("--offset",              default="32",             help="Capture Offset.")
-    parser.add_argument("--length",              default="128",            help="Capture Length.")
+    parser.add_argument("--length",              default=None,             help="Capture Length.")
     args = parser.parse_args()
     return args
 
@@ -112,7 +112,10 @@ def main():
         if not add_triggers(args, analyzer, signals):
             print("WARNING: no trigger added!")
 
-        analyzer.run(offset=int(args.offset, 0), length=int(args.length, 0))
+        analyzer.run(
+            offset = int(args.offset, 0),
+            length = None if args.length is None else int(args.length, 0)
+        )
 
         analyzer.wait_done()
         analyzer.upload()