litex-boards/litex_boards/targets/ecp5_evn.py

90 lines
3.5 KiB
Python
Executable File

#!/usr/bin/env python3
# This file is Copyright (c) 2019 Arnaud Durand <arnaud.durand@unifr.ch>
# License: BSD
import os
import argparse
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex_boards.platforms import ecp5_evn
from litex.soc.cores.clock import *
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform, sys_clk_freq, x5_clk_freq):
self.clock_domains.cd_sys = ClockDomain()
# # #
# clk / rst
clk = clk12 = platform.request("clk12")
rst_n = platform.request("rst_n")
if x5_clk_freq is not None:
clk = clk50 = platform.request("ext_clk50")
self.comb += platform.request("ext_clk50_en").eq(1)
platform.add_period_constraint(clk50, 1e9/x5_clk_freq)
# pll
self.submodules.pll = pll = ECP5PLL()
self.comb += pll.reset.eq(~rst_n)
pll.register_clkin(clk, x5_clk_freq or 12e6)
pll.create_clkout(self.cd_sys, sys_clk_freq)
self.specials += AsyncResetSynchronizer(self.cd_sys, ~rst_n)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=int(50e6), x5_clk_freq=None, toolchain="trellis", **kwargs):
platform = ecp5_evn.Platform(toolchain=toolchain)
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on ECP5 Evaluation Board",
ident_version = True,
**kwargs)
# CRG --------------------------------------------------------------------------------------
crg = _CRG(platform, sys_clk_freq, x5_clk_freq)
self.submodules.crg = crg
# Leds -------------------------------------------------------------------------------------
self.submodules.leds = LedChaser(
pads = Cat(*[platform.request("user_led", i) for i in range(8)]),
sys_clk_freq = sys_clk_freq)
self.add_csr("leds")
# Build --------------------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on ECP5 Evaluation Board")
parser.add_argument("--build", action="store_true", help="Build bitstream")
parser.add_argument("--load", action="store_true", help="Load bitstream")
parser.add_argument("--toolchain", default="trellis", help="Gateware toolchain to use, trellis (default) or diamond")
builder_args(parser)
soc_core_args(parser)
parser.add_argument("--sys-clk-freq", default=60e6, help="System clock frequency (default=60MHz)")
parser.add_argument("--x5-clk-freq", type=int, help="Use X5 oscillator as system clock at the specified frequency")
args = parser.parse_args()
soc = BaseSoC(toolchain=args.toolchain,
sys_clk_freq = int(float(args.sys_clk_freq)),
x5_clk_freq = args.x5_clk_freq,
**soc_core_argdict(args))
builder = Builder(soc, **builder_argdict(args))
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 + ".svf"))
if __name__ == "__main__":
main()