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build.dsl: accept Pins(invert=True).

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The PinsN() form is still preferred, but Pins(invert=) form is useful
for code generic over pin polarity.
This commit is contained in:
whitequark 2019-10-03 02:44:43 +00:00
parent 9458de2079
commit 751ae33fe1
2 changed files with 6 additions and 2 deletions
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4
nmigen/build/dsl.py
View file

@ -6,7 +6,7 @@ __all__ = ["Pins", "PinsN", "DiffPairs", "DiffPairsN",
class Pins: class Pins:
def __init__(self, names, *, dir="io", conn=None, assert_width=None): def __init__(self, names, *, dir="io", invert=False, conn=None, assert_width=None):
if not isinstance(names, str): if not isinstance(names, str):
raise TypeError("Names must be a whitespace-separated string, not {!r}" raise TypeError("Names must be a whitespace-separated string, not {!r}"
.format(names)) .format(names))
@ -29,7 +29,7 @@ class Pins:
self.names = names self.names = names
self.dir = dir self.dir = dir
self.invert = False self.invert = bool(invert)
def __len__(self): def __len__(self):
return len(self.names) return len(self.names)

4
nmigen/test/test_build_dsl.py
View file

@ -18,6 +18,10 @@ class PinsTestCase(FHDLTestCase):
self.assertEqual(repr(p), "(pins-n io A0)") self.assertEqual(repr(p), "(pins-n io A0)")
self.assertEqual(p.invert, True) self.assertEqual(p.invert, True)
def test_invert_arg(self):
p = Pins("A0", invert=True)
self.assertEqual(p.invert, True)
def test_conn(self): def test_conn(self):
p = Pins("0 1 2", conn=("pmod", 0)) p = Pins("0 1 2", conn=("pmod", 0))
self.assertEqual(list(p), ["pmod_0:0", "pmod_0:1", "pmod_0:2"]) self.assertEqual(list(p), ["pmod_0:0", "pmod_0:1", "pmod_0:2"])