litex/migen/test/test_syntax.py

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import unittest
import subprocess
import os
from migen import *
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from migen.fhdl.verilog import convert
# Create a module with some combinatorial, some sequential, and some simple
# assigns
class SyntaxModule(Module):
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def __init__(self):
x = [Signal(8) for y in range(10)]
y = [Signal(8) for z in range(10)]
en = Signal()
a = Signal()
b = Signal()
z = Signal()
as_src = Signal(16);
as_tgt1 = Signal(16);
as_tgt2 = Signal(16);
self.io = {a, b, z, en, as_src, as_tgt1, as_tgt2}
self.comb += If(a, z.eq(b))
self.comb += as_tgt1.eq(as_src)
self.comb += as_tgt2.eq(100)
for xi in x:
self.io.add(xi)
for xi in range(1, len(x)):
self.comb += If(en, y[xi].eq(x[xi-1])).Else(y[xi].eq(x[xi]))
self.sync += x[xi].eq(y[xi])
# Create unit test to build module, run Verilator and check for errors
class SyntaxCase(unittest.TestCase):
def base_test(self, name, asic_syntax, options=[]):
filename = "test_module_{}.v".format(name)
t = SyntaxModule()
c = convert(t, t.io, name="test_module", asic_syntax=asic_syntax)
f = open(filename, "w")
f.write(str(c))
f.close()
subprocess.check_call("verilator --lint-only " + " ".join(options) + " " + filename,
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stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL, shell=True)
os.unlink(filename)
# XXX for now desactivate, travis-ci's Verilator seems to behave differently
# XXX upgrade travis-ci's Verilator?
#def test_generic_syntax(self):
# options = [
# "-Wno-WIDTH",
# "-Wno-COMBDLY",
# "-Wno-INITIALDLY"
# ]
# self.base_test("generic", False, options)
def test_asic_syntax(self):
options = [
"-Wno-WIDTH", # XXX should we improve ASIC backend to remove this?
]
self.base_test("asic", True, options)