litex-boards/litex_boards/targets/sipeed_tang_primer.py

89 lines
3.0 KiB
Python
Executable File

#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2021 Miodrag Milanovic <mmicko@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex.gen import *
from litex_boards.platforms import sipeed_tang_primer
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
# CRG ----------------------------------------------------------------------------------------------
class _CRG(LiteXModule):
def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.cd_sys = ClockDomain()
# # #
# Clk / Rst.
clk24 = platform.request("clk24")
rst_n = platform.request("user_btn", 0)
self.comb += self.cd_sys.clk.eq(clk24)
self.specials += AsyncResetSynchronizer(self.cd_sys, ~rst_n | self.rst)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=24e6, with_led_chaser=True, **kwargs):
platform = sipeed_tang_primer.Platform()
# CRG --------------------------------------------------------------------------------------
self.crg = _CRG(platform, sys_clk_freq)
# SoCCore ----------------------------------------------------------------------------------
if kwargs.get("cpu_type", "vexriscv") == "vexriscv":
kwargs["cpu_variant"] = "minimal"
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Tang Primer", **kwargs)
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
# Build --------------------------------------------------------------------------------------------
def main():
from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=sipeed_tang_primer.Platform, description="LiteX SoC on Tang Primer.")
parser.add_target_argument("--flash", action="store_true", help="Flash Bitstream.")
parser.add_target_argument("--sys-clk-freq", default=24e6, type=float, help="System clock frequency.")
args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq = args.sys_clk_freq,
**parser.soc_argdict
)
builder = Builder(soc, **parser.builder_argdict)
if args.build:
builder.build(**parser.toolchain_argdict)
if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
if args.flash:
prog = soc.platform.create_programmer()
prog.load_bitstream(builder.get_bitstream_filename(mode="flash", ext=".bin")) # FIXME
if __name__ == "__main__":
main()