litex-boards/litex_boards/targets/lattice_crosslink_nx_evn.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
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# Copyright (c) 2020 David Corrigan <davidcorrigan714@gmail.com>
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# Copyright (c) 2020 Alan Green <avg@google.com>
# SPDX-License-Identifier: BSD-2-Clause
import os
import argparse
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex_boards.platforms import crosslink_nx_evn
from litex.soc.cores.ram import NXLRAM
from litex.soc.cores.clock import NXPLL
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from litex.soc.cores.spi_flash import SpiFlash
from litex.build.io import CRG
from litex.build.generic_platform import *
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
from litex.build.lattice.oxide import oxide_args, oxide_argdict
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kB = 1024
mB = 1024*kB
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform, sys_clk_freq):
self.clock_domains.cd_por = ClockDomain()
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self.clock_domains.cd_sys = ClockDomain()
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# Built in OSC
self.submodules.hf_clk = NXOSCA()
hf_clk_freq = 25e6
self.hf_clk.create_hf_clk(self.cd_por, hf_clk_freq)
# Power on reset
por_count = Signal(16, reset=2**16-1)
por_done = Signal()
self.comb += por_done.eq(por_count == 0)
self.sync.por += If(~por_done, por_count.eq(por_count - 1))
self.rst_n = platform.request("gsrn")
self.specials += AsyncResetSynchronizer(self.cd_por, ~self.rst_n)
# PLL
self.submodules.sys_pll = sys_pll = NXPLL(platform=platform, create_output_port_clocks=True)
sys_pll.register_clkin(self.cd_por.clk, hf_clk_freq)
sys_pll.create_clkout(self.cd_sys, sys_clk_freq)
self.specials += AsyncResetSynchronizer(self.cd_sys, ~self.sys_pll.locked | ~por_done )
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# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
mem_map = {
"rom" : 0x00000000,
"sram" : 0x40000000,
"csr" : 0xf0000000,
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}
def __init__(self, sys_clk_freq=int(75e6), toolchain="radiant", **kwargs):
platform = crosslink_nx_evn.Platform(toolchain=toolchain)
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platform.add_platform_command("ldc_set_sysconfig {{MASTER_SPI_PORT=SERIAL}}")
# Disable Integrated SRAM since we want to instantiate LRAM specifically for it
kwargs["integrated_sram_size"] = 0
# Make serial_pmods available
platform.add_extension(crosslink_nx_evn.serial_pmods)
# SoCCore -----------------------------------------_----------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on Crosslink-NX Evaluation Board",
ident_version = True,
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**kwargs)
# CRG --------------------------------------------------------------------------------------
self.submodules.crg = _CRG(platform, sys_clk_freq)
# 128KB LRAM (used as SRAM) ---------------------------------------------------------------
size = 128*kB
self.submodules.spram = NXLRAM(32, size)
self.register_mem("sram", self.mem_map["sram"], self.spram.bus, size)
# Leds -------------------------------------------------------------------------------------
self.submodules.leds = LedChaser(
pads = Cat(*[platform.request("user_led", i) for i in range(14)]),
sys_clk_freq = sys_clk_freq)
# Build --------------------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on Crosslink-NX Eval 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="radiant", help="FPGA toolchain: radiant (default) or prjoxide")
parser.add_argument("--sys-clk-freq", default=75e6, help="System clock frequency (default: 75MHz)")
parser.add_argument("--serial", default="serial", help="UART Pins: serial (default, requires R15 and R17 to be soldered) or serial_pmod[0-2]")
parser.add_argument("--prog-target", default="direct", help="Programming Target: direct or flash")
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builder_args(parser)
soc_core_args(parser)
oxide_args(parser)
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args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq = int(float(args.sys_clk_freq)),
toolchain = args.toolchain,
**soc_core_argdict(args)
)
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builder = Builder(soc, **builder_argdict(args))
builder_kargs = oxide_argdict(args) if args.toolchain == "oxide" else {}
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builder.build(**builder_kargs, run=args.build)
if args.load:
prog = soc.platform.create_programmer(args.prog_target)
prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bit"))
if __name__ == "__main__":
main()