litex/test/test_stream.py

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#
# This file is part of LiteX.
#
# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
import unittest
import random
from migen import *
from litex.soc.interconnect.stream import *
class TestStream(unittest.TestCase):
def pipe_test(self, dut):
prng = random.Random(42)
def generator(dut, valid_rand=90):
for data in range(128):
yield dut.sink.valid.eq(1)
yield dut.sink.data.eq(data)
yield
while (yield dut.sink.ready) == 0:
yield
yield dut.sink.valid.eq(0)
while prng.randrange(100) < valid_rand:
yield
def checker(dut, ready_rand=90):
dut.errors = 0
for data in range(128):
yield dut.source.ready.eq(0)
yield
while (yield dut.source.valid) == 0:
yield
while prng.randrange(100) < ready_rand:
yield
yield dut.source.ready.eq(1)
yield
if ((yield dut.source.data) != data):
dut.errors += 1
yield
run_simulation(dut, [generator(dut), checker(dut)])
self.assertEqual(dut.errors, 0)
def test_pipe_valid(self):
dut = PipeValid([("data", 8)])
self.pipe_test(dut)
def test_pipe_ready(self):
dut = PipeReady([("data", 8)])
self.pipe_test(dut)
def test_buffer_valid(self):
dut = Buffer([("data", 8)], pipe_valid=True, pipe_ready=False)
self.pipe_test(dut)
def test_buffer_ready(self):
dut = Buffer([("data", 8)], pipe_valid=False, pipe_ready=True)
self.pipe_test(dut)
def test_buffer_valid_ready(self):
dut = Buffer([("data", 8)], pipe_valid=True, pipe_ready=True)
self.pipe_test(dut)