liteeth/bench/arty.py

#!/usr/bin/env python3

#
# This file is part of LiteEth.
#
# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause

import os
import argparse

from migen import *

from litex_boards.platforms import arty
from litex_boards.targets.arty import _CRG

from litex.soc.cores.clock import *
from litex.soc.interconnect.csr import *
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *

from liteeth.phy.mii import LiteEthPHYMII

# Bench SoC ----------------------------------------------------------------------------------------

class BenchSoC(SoCCore):
    def __init__(self, sys_clk_freq=int(50e6)):
        platform = arty.Platform()

        # SoCMini ----------------------------------------------------------------------------------
        SoCMini.__init__(self, platform, clk_freq=sys_clk_freq,
            ident          = "LiteEth bench on Arty",
            ident_version  = True
        )

        # CRG --------------------------------------------------------------------------------------
        self.submodules.crg = _CRG(platform, sys_clk_freq)

        # Etherbone --------------------------------------------------------------------------------
        self.submodules.ethphy = LiteEthPHYMII(
            clock_pads = self.platform.request("eth_clocks"),
            pads       = self.platform.request("eth"),
            with_hw_init_reset = False)
        self.add_csr("ethphy")
        self.add_etherbone(phy=self.ethphy, buffer_depth=255)

        # SRAM -------------------------------------------------------------------------------------
        self.add_ram("sram", 0x20000000, 0x1000)

        # Leds -------------------------------------------------------------------------------------
        from litex.soc.cores.led import LedChaser
        self.submodules.leds = LedChaser(
            pads         = platform.request_all("user_led"),
            sys_clk_freq = sys_clk_freq)
        self.add_csr("leds")

# Main ---------------------------------------------------------------------------------------------

def main():
    parser = argparse.ArgumentParser(description="LiteEth Bench on Arty A7")
    parser.add_argument("--build",       action="store_true", help="Build bitstream")
    parser.add_argument("--load",        action="store_true", help="Load bitstream")
    args = parser.parse_args()

    soc     = BenchSoC()
    builder = Builder(soc, csr_csv="csr.csv")
    builder.build(run=args.build)

    if args.load:
        prog = soc.platform.create_programmer()
        prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bit"))

if __name__ == "__main__":
    main()