litex-boards/litex_boards/targets/hadbadge.py

88 lines
3.3 KiB
Python
Executable File

#!/usr/bin/env python3
# This file is Copyright (c) 2020 Michael Welling <mwelling@ieee.org>
# This file is Copyright (c) 2020 Sean Cross <sean@xobs.io>
# This file is Copyright (c) 2020 Drew Fustini <drew@pdp7.com>
# This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# License: BSD
import argparse
import sys
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex_boards.platforms import hadbadge
from litex.soc.cores.clock import *
from litex.soc.integration.soc_sdram 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(Module):
def __init__(self, platform, sys_clk_freq):
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_sys_ps = ClockDomain(reset_less=True)
# # #
# Clk / Rst
clk8 = platform.request("clk8")
platform.add_period_constraint(clk8, 1e9/8e6)
# PLL
self.submodules.pll = pll = ECP5PLL()
pll.register_clkin(clk8, 8e6)
pll.create_clkout(self.cd_sys, sys_clk_freq, phase=11)
pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=20)
self.specials += AsyncResetSynchronizer(self.cd_sys, ~pll.locked)
# SDRAM clock
self.comb += platform.request("sdram_clock").eq(self.cd_sys_ps.clk)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCSDRAM):
def __init__(self, toolchain="trellis", sys_clk_freq=int(48e6), sdram_module_cls="AS4C32M8", **kwargs):
platform = hadbadge.Platform(toolchain=toolchain)
# SoCSDRAM ---------------------------------------------------------------------------------
SoCSDRAM.__init__(self, platform, clk_freq=sys_clk_freq, **kwargs)
# CRG --------------------------------------------------------------------------------------
self.submodules.crg = _CRG(platform, sys_clk_freq)
# SDR SDRAM --------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
self.submodules.sdrphy = GENSDRPHY(platform.request("sdram"), cl=2)
sdram_module = AS4C32M8(sys_clk_freq, "1:1")
self.register_sdram(self.sdrphy,
sdram_module.geom_settings,
sdram_module.timing_settings)
# Build --------------------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on Hackaday Badge")
parser.add_argument("--gateware-toolchain", dest="toolchain", default="trellis",
help='gateware toolchain to use, diamond or trellis (default)')
parser.add_argument("--sys-clk-freq", default=48e6,
help="system clock frequency (default=48MHz)")
builder_args(parser)
soc_sdram_args(parser)
args = parser.parse_args()
soc = BaseSoC(toolchain=args.toolchain,
sys_clk_freq=int(float(args.sys_clk_freq)),
**soc_sdram_argdict(args))
builder = Builder(soc, **builder_argdict(args))
builder.build()
if __name__ == "__main__":
main()