From: whitequark <whitequark@whitequark.org>
Date: Mon, 22 Jun 2020 15:07:54 +0000 (+0000)
Subject: resources: allow UARTResource without control signals to have no role.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a889afebd9e584af449e27c573148e8aa257120e;p=nmigen-boards.git

resources: allow UARTResource without control signals to have no role.
---

diff --git a/nmigen_boards/resources/interface.py b/nmigen_boards/resources/interface.py
index 97489e2..848e1b8 100644
--- a/nmigen_boards/resources/interface.py
+++ b/nmigen_boards/resources/interface.py
@@ -6,7 +6,8 @@ __all__ = ["UARTResource", "IrDAResource", "SPIResource"]
 
 def UARTResource(*args, rx, tx, rts=None, cts=None, dtr=None, dsr=None, dcd=None, ri=None,
                  conn=None, attrs=None, role=None):
-    assert role in ("dce", "dte")
+    if any(line is not None for line in (rts, cts, dtr, dsr, dcd, ri)):
+        assert role in ("dce", "dte")
     if role == "dte":
         dce_to_dte = "i"
         dte_to_dce = "o"