88 lines
3.3 KiB
Python
Executable File
88 lines
3.3 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# This file is part of LiteX-Boards.
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#
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# Copyright (c) 2019 Arnaud Durand <arnaud.durand@unifr.ch>
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# SPDX-License-Identifier: BSD-2-Clause
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from migen import *
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from migen.genlib.resetsync import AsyncResetSynchronizer
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from litex.gen import LiteXModule
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from litex_boards.platforms import lattice_ecp5_evn
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from litex.soc.cores.clock import *
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from litex.soc.integration.soc_core import *
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from litex.soc.integration.builder import *
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from litex.soc.cores.led import LedChaser
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# CRG ----------------------------------------------------------------------------------------------
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class _CRG(LiteXModule):
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def __init__(self, platform, sys_clk_freq, x5_clk_freq):
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self.rst = Signal()
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self.cd_sys = ClockDomain()
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# # #
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# Clk / Rst.
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clk = clk12 = platform.request("clk12")
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rst_n = platform.request("rst_n")
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if x5_clk_freq is not None:
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clk = clk50 = platform.request("ext_clk50")
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self.comb += platform.request("ext_clk50_en").eq(1)
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platform.add_period_constraint(clk50, 1e9/x5_clk_freq)
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# PLL.
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self.pll = pll = ECP5PLL()
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self.comb += pll.reset.eq(~rst_n | self.rst)
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pll.register_clkin(clk, x5_clk_freq or 12e6)
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pll.create_clkout(self.cd_sys, sys_clk_freq)
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
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def __init__(self, sys_clk_freq=50e6, toolchain="trellis", x5_clk_freq=None,
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with_led_chaser = True,
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**kwargs):
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platform = lattice_ecp5_evn.Platform(toolchain=toolchain)
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# CRG --------------------------------------------------------------------------------------
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self.crg = _CRG(platform, sys_clk_freq, x5_clk_freq)
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# SoCCore ----------------------------------------------------------------------------------
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SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on ECP5 Evaluation Board", **kwargs)
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# Leds -------------------------------------------------------------------------------------
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if with_led_chaser:
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self.leds = LedChaser(
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pads = platform.request_all("user_led"),
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sys_clk_freq = sys_clk_freq)
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# Build --------------------------------------------------------------------------------------------
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def main():
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from litex.build.parser import LiteXArgumentParser
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parser = LiteXArgumentParser(platform=lattice_ecp5_evn.Platform, description="LiteX SoC on ECP5 Evaluation Board.")
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parser.add_target_argument("--sys-clk-freq", default=60e6, type=float, help="System clock frequency.")
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parser.add_target_argument("--x5-clk-freq", type=int, help="Use X5 oscillator as system clock at the specified frequency.")
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args = parser.parse_args()
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soc = BaseSoC(
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toolchain = args.toolchain,
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sys_clk_freq = args.sys_clk_freq,
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x5_clk_freq = args.x5_clk_freq,
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**parser.soc_argdict)
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builder = Builder(soc, **parser.builder_argdict)
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if args.build:
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builder.build(**parser.toolchain_argdict)
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if args.load:
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prog = soc.platform.create_programmer()
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prog.load_bitstream(builder.get_bitstream_filename(mode="sram", ext=".svf")) # FIXME
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if __name__ == "__main__":
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main()
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