litex-boards/litex_boards/targets/hackaday_hadbadge.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2020 Michael Welling <mwelling@ieee.org>
# Copyright (c) 2020 Sean Cross <sean@xobs.io>
# Copyright (c) 2020 Drew Fustini <drew@pdp7.com>
# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex.gen import LiteXModule
from litex.build.io import DDROutput
from litex_boards.platforms import hackaday_hadbadge
from litex.soc.cores.clock import *
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *
from litedram import modules as litedram_modules
from litedram.phy import GENSDRPHY
from litedram.modules import AS4C32M8
# CRG ----------------------------------------------------------------------------------------------
class _CRG(LiteXModule):
def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.cd_sys = ClockDomain()
self.cd_sys_ps = ClockDomain()
# # #
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# Clk / Rst
clk8 = platform.request("clk8")
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# PLL
self.pll = pll = ECP5PLL()
pll.pfd_freq_range = (8e6, 400e6) # Lower Min from 10MHz to 8MHz.
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(clk8, 8e6)
pll.create_clkout(self.cd_sys, sys_clk_freq)
pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=90)
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# SDRAM clock
self.specials += DDROutput(1, 0, platform.request("sdram_clock"), ClockSignal("sys_ps"))
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, toolchain="trellis", sys_clk_freq=int(48e6), sdram_module_cls="AS4C32M8", **kwargs):
platform = hackaday_hadbadge.Platform(toolchain=toolchain)
# CRG --------------------------------------------------------------------------------------
self.crg = _CRG(platform, sys_clk_freq)
# SoCCore ---------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Hackaday Badge", **kwargs)
# SDR SDRAM --------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
self.sdrphy = GENSDRPHY(platform.request("sdram"), sys_clk_freq)
self.add_sdram("sdram",
phy = self.sdrphy,
module = AS4C32M8(sys_clk_freq, "1:1"),
l2_cache_size = kwargs.get("l2_size", 8192)
)
# Build --------------------------------------------------------------------------------------------
def main():
from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=hackaday_hadbadge.Platform, description="LiteX SoC on Hackaday Badge")
parser.add_target_argument("--sys-clk-freq", default=48e6, help="System clock frequency.")
args = parser.parse_args()
soc = BaseSoC(
toolchain = args.toolchain,
sys_clk_freq = int(float(args.sys_clk_freq)),
**parser.soc_core_argdict)
builder = Builder(soc, **parser.builder_argdict)
if args.build:
builder.build(**parser.toolchain_argdict)
if __name__ == "__main__":
main()