96 lines
4.1 KiB
Python
Executable File
96 lines
4.1 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) 2020-2021 Xuanyu Hu <xuanyu.hu@whu.edu.cn>
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# SPDX-License-Identifier: BSD-2-Clause
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from migen import *
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from litex.gen import *
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from litex_boards.platforms import digilent_basys3
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from litex.soc.cores.clock import *
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from litex.soc.integration.soc import SoCRegion
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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.video import VideoVGAPHY
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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):
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self.rst = Signal()
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self.cd_sys = ClockDomain()
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self.cd_vga = ClockDomain()
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self.pll = pll = S7MMCM(speedgrade=-1)
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self.comb += pll.reset.eq(platform.request("user_btnc") | self.rst)
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pll.register_clkin(platform.request("clk100"), 100e6)
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pll.create_clkout(self.cd_sys, sys_clk_freq)
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pll.create_clkout(self.cd_vga, 40e6)
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platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst.
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#platform.add_platform_command("set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets clk100_IBUF]")
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
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def __init__(self, sys_clk_freq=75e6, with_led_chaser=True, with_video_terminal=False, **kwargs):
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platform = digilent_basys3.Platform()
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# CRG --------------------------------------------------------------------------------------
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self.crg = _CRG(platform, sys_clk_freq)
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# SoCCore ----------------------------------_-----------------------------------------------
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SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Basys3", **kwargs)
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# Video ------------------------------------------------------------------------------------
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if with_video_terminal:
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self.videophy = VideoVGAPHY(platform.request("vga"), clock_domain="vga")
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if with_video_terminal:
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self.add_video_terminal(phy=self.videophy, timings="800x600@60Hz", clock_domain="vga")
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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=digilent_basys3.Platform, description="LiteX SoC on Basys3.")
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parser.add_target_argument("--sys-clk-freq", default=75e6, type=float, help="System clock frequency.")
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sdopts = parser.target_group.add_mutually_exclusive_group()
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sdopts.add_argument("--with-spi-sdcard", action="store_true", help="Enable SPI-mode SDCard support.")
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sdopts.add_argument("--with-sdcard", action="store_true", help="Enable SDCard support.")
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parser.add_target_argument("--sdcard-adapter", help="SDCard PMOD adapter (digilent or numato).")
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viopts = parser.target_group.add_mutually_exclusive_group()
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viopts.add_argument("--with-video-terminal", action="store_true", help="Enable Video Terminal (VGA).")
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args = parser.parse_args()
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soc = BaseSoC(
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sys_clk_freq = args.sys_clk_freq,
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with_video_terminal = args.with_video_terminal,
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**parser.soc_argdict
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)
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soc.platform.add_extension(digilent_basys3._sdcard_pmod_io)
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if args.with_spi_sdcard:
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soc.add_spi_sdcard()
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if args.with_sdcard:
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soc.add_sdcard()
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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"))
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if __name__ == "__main__":
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main()
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