102 lines
3.4 KiB
Python
102 lines
3.4 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-Only
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# Copyright (C) 2022 Sean Anderson <seanga2@gmail.com>
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import itertools
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import cocotb
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from cocotb.binary import BinaryValue
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from cocotb.clock import Clock
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from cocotb.triggers import ClockCycles, Combine, FallingEdge, Join, RisingEdge, Timer
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from cocotb.types import LogicArray
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from .descramble import scramble
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from .mdio_regs import BMSR, BMSR_LSTATUS, VCR, VCR_LTEST, wb_xfer
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from .nrzi_encode import nrzi_encode
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from .nrzi_decode import nrzi_decode
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from .pcs_tx import as_nibbles, mii_send_packet, pcs_recv_packet
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from .pcs_rx import frame, mii_recv_packet
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from .scramble import descramble
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from .util import BIT, alist
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@cocotb.test(timeout_time=5, timeout_unit='us')
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async def test_hub(hub):
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hub.clk_125.value = BinaryValue('Z')
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hub.clk_250.value = BinaryValue('Z')
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hub.signal_detect.value = 0
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hub.wb_cyc.value = 1
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await Timer(1)
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await cocotb.start(Clock(hub.clk_125, 8, units='ns').start())
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await cocotb.start(Clock(hub.clk_250, 4, units='ns').start())
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wb = {
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'clk': hub.clk_125,
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'cyc': hub.wb_cyc,
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'stb': hub.wb_stb,
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'we': hub.wb_we,
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'addr': hub.wb_addr,
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'data_write': hub.wb_data_write,
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'data_read': hub.wb_data_read,
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'ack': hub.wb_ack,
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'err': hub.wb_err,
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}
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# Enable fast link stabilization for testing
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for i in range(4):
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await wb_xfer(wb, BIT(i + 5) + VCR, VCR_LTEST)
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packet = list(as_nibbles((0x55, *b"Hello world!")))
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packet_bits = list(itertools.chain.from_iterable(frame(packet)))
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itertools.chain(itertools.repeat(1, 120), packet_bits, itertools.repeat(1))
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async def send_rx(i, bits):
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hub.signal_detect[i].value = 1
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for bit in nrzi_encode(scramble(bits)):
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hub.indicate_data[i].value = bit
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await Timer(8, units='ns')
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hub.signal_detect[i].value = 0
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hub.indicate_data[i].value = BinaryValue('X')
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async def recv_tx(i, packets):
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async def bits():
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await ClockCycles(hub.clk_125, 1)
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while True:
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await RisingEdge(hub.clk_125)
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yield hub.request_data[i].value
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data = descramble(nrzi_decode(bits()))
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for expected, valid in packets:
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actual = await alist(pcs_recv_packet(None, data))
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if valid:
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assert actual == expected
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else:
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assert actual != expected
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await cocotb.start(send_rx(0, itertools.chain(
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itertools.repeat(1, 120),
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packet_bits,
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itertools.repeat(1, 120),
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packet_bits,
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itertools.repeat(1),
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)))
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await cocotb.start(send_rx(1, itertools.chain(
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itertools.repeat(1, 300),
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packet_bits,
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itertools.repeat(1),
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)))
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await cocotb.start(send_rx(2, itertools.repeat(1)))
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await cocotb.start(send_rx(3, itertools.repeat(1)))
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receivers = [
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await cocotb.start(recv_tx(0, ((packet, False),))),
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await cocotb.start(recv_tx(1, ((packet, True), (packet, False)))),
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await cocotb.start(recv_tx(2, ((packet, True), (packet, False)))),
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await cocotb.start(recv_tx(3, ((packet, True), (packet, False)))),
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]
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await Combine(*(Join(t) for t in receivers))
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for i in range(4):
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assert not await wb_xfer(wb, BIT(i + 5) + BMSR) & BMSR_LSTATUS
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assert await wb_xfer(wb, BIT(i + 5) + BMSR) & BMSR_LSTATUS
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