litescope/test/test_analyzer.py

#
# This file is part of LiteScope.
#
# Copyright (c) 2017-2019 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause

import unittest

from migen import *

from litescope import LiteScopeAnalyzer


class TestAnalyzer(unittest.TestCase):
    def test_analyzer(self):
        def generator(dut):
            dut.data = []
            # Configure Trigger
            yield from dut.analyzer.trigger.mem_value.write(0x0010)
            yield from dut.analyzer.trigger.mem_mask.write(0xffff)
            yield from dut.analyzer.trigger.mem_write.write(1)

            # Configure Subsampler
            yield from dut.analyzer.subsampler.value.write(2)

            # Configure Storage
            yield from dut.analyzer.storage.length.write(256)
            yield from dut.analyzer.storage.offset.write(8)
            yield from dut.analyzer.storage.enable.write(1)
            yield
            for i in range(16):
                yield
            # Wait capture
            while not (yield from dut.analyzer.storage.done.read()):
                yield
            # Read captured datas
            while (yield from dut.analyzer.storage.mem_level.read()) > 0:
                dut.data.append((yield from dut.analyzer.storage.mem_data.read()))
                yield

        class DUT(Module):
            def __init__(self):
                counter = Signal(32)
                self.sync += counter.eq(counter + 1)
                self.submodules.analyzer = LiteScopeAnalyzer(counter, 512)

        dut = DUT()
        generators = {"sys" : [generator(dut)]}
        clocks     = {"sys": 10, "scope": 10}
        run_simulation(dut, generators, clocks, vcd_name="sim.vcd")
        self.assertEqual(dut.data, [524 + 3*i for i in range(len(dut.data))])