131 lines
4.8 KiB
Python
Executable File
131 lines
4.8 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# This file is part of LiteEth.
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#
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# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
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# SPDX-License-Identifier: BSD-2-Clause
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import os
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import argparse
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from migen import *
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from migen.genlib.cdc import MultiReg
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from migen.genlib.misc import WaitTimer
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from litex_boards.platforms import arty
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from litex_boards.targets.arty import _CRG
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from litex.soc.cores.clock import *
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from litex.soc.interconnect.csr import *
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from litex.soc.integration.soc_core import *
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from litex.soc.integration.builder import *
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from litex.soc.cores.led import LedChaser
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from liteeth.phy.mii import LiteEthPHYMII
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# Bench SoC ----------------------------------------------------------------------------------------
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class BenchSoC(SoCCore):
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def __init__(self, sys_clk_freq=int(50e6)):
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platform = arty.Platform()
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# SoCMini ----------------------------------------------------------------------------------
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SoCMini.__init__(self, platform, clk_freq=sys_clk_freq,
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ident = "LiteEth bench on Arty",
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ident_version = True
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)
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# CRG --------------------------------------------------------------------------------------
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self.submodules.crg = _CRG(platform, sys_clk_freq)
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# Etherbone --------------------------------------------------------------------------------
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self.submodules.ethphy = LiteEthPHYMII(
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clock_pads = self.platform.request("eth_clocks"),
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pads = self.platform.request("eth"),
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with_hw_init_reset = False)
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self.add_etherbone(phy=self.ethphy, buffer_depth=255)
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# SRAM -------------------------------------------------------------------------------------
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self.add_ram("sram", 0x20000000, 0x1000)
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# UDP Streamer -----------------------------------------------------------------------------
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from liteeth.frontend.stream import LiteEthUDPStreamer
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self.submodules.udp_streamer = udp_streamer = LiteEthUDPStreamer(
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udp = self.ethcore.udp,
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ip_address = "192.168.1.100",
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udp_port = 6000,
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)
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# Leds -------------------------------------------------------------------------------------
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leds_pads = platform.request_all("user_led")
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# Led Chaser (Default).
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chaser_leds = Signal(len(leds_pads))
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self.submodules.leds = LedChaser(
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pads = chaser_leds,
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sys_clk_freq = sys_clk_freq)
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# Led Control from UDP Streamer RX.
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udp_leds = Signal(len(leds_pads))
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self.comb += udp_streamer.source.ready.eq(1)
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self.sync += If(udp_streamer.rx.source.valid,
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udp_leds.eq(udp_streamer.source.data)
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)
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# Led Mux: Switch to received UDP value for 1s then switch back to Led Chaser.
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self.submodules.leds_timer = leds_timer = WaitTimer(sys_clk_freq)
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self.comb += [
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leds_timer.wait.eq(~udp_streamer.rx.source.valid), # Reload Timer on new UDP value.
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If(leds_timer.done,
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leds_pads.eq(chaser_leds)
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).Else(
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leds_pads.eq(udp_leds)
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)
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]
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# Switches ---------------------------------------------------------------------------------
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if False:
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# Resynchronize Swiches inputs.
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switches_pads = platform.request_all("user_sw")
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switches = Signal(len(switches_pads))
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self.specials += MultiReg(switches_pads, switches)
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# Send Switches value on UDP Streamer TX every 500ms.
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switches_timer = WaitTimer(int(500e-3*sys_clk_freq))
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switches_fsm = FSM(reset_state="IDLE")
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self.submodules += switches_timer, switches_fsm
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switches_fsm.act("IDLE",
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switches_timer.wait.eq(1),
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If(switches_timer.done,
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NextState("SEND")
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)
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)
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switches_fsm.act("SEND",
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udp_streamer.sink.valid.eq(1),
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udp_streamer.sink.data.eq(switches),
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If(udp_streamer.sink.ready,
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NextState("IDLE")
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)
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)
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# Main ---------------------------------------------------------------------------------------------
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def main():
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parser = argparse.ArgumentParser(description="LiteEth Bench on Arty A7")
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parser.add_argument("--build", action="store_true", help="Build bitstream")
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parser.add_argument("--load", action="store_true", help="Load bitstream")
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args = parser.parse_args()
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soc = BenchSoC()
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builder = Builder(soc, csr_csv="csr.csv")
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builder.build(run=args.build)
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if args.load:
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prog = soc.platform.create_programmer()
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prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bit"))
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if __name__ == "__main__":
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main()
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