133 lines
5.3 KiB
Python
Executable File
133 lines
5.3 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) 2021 Miodrag Milanovic <mmicko@gmail.com>
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# Copyright (c) 2021 Andrew Dennison <andrew@motec.com.au>
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# Copyright (c) 2021 Franck Jullien <franck.jullien@collshade.fr>
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# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
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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 *
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from litex.gen.genlib.misc import WaitTimer
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from litex_boards.platforms import jungle_electronics_fireant
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from litex.build.generic_platform import *
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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.soc import SoCRegion
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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):
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self.rst = Signal()
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self.cd_sys = ClockDomain()
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self.cd_rst = ClockDomain(reset_less=True)
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# # #
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clk33 = platform.request("clk33")
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rst_n = platform.request("user_btn", 0)
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self.comb += self.cd_rst.clk.eq(clk33)
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# A pulse is necessary to do a reset.
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self.rst_pulse = Signal()
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self.reset_timer = reset_timer = ClockDomainsRenamer("rst")(WaitTimer(25e-6*platform.default_clk_freq))
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self.comb += self.rst_pulse.eq(self.rst ^ reset_timer.done)
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self.comb += reset_timer.wait.eq(self.rst)
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# PLL.
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self.pll = pll = TRIONPLL(platform)
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self.comb += pll.reset.eq(~rst_n | self.rst_pulse)
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pll.register_clkin(clk33, platform.default_clk_freq)
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pll.create_clkout(self.cd_sys, sys_clk_freq, with_reset=True)
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# Default peripherals
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serial = [
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("serial", 0,
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Subsignal("tx", Pins("J2:2")),
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Subsignal("rx", Pins("J2:3")),
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IOStandard("3.3_V_LVTTL_/_LVCMOS") , Misc("WEAK_PULLUP")
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)
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]
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
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def __init__(self, bios_flash_offset, sys_clk_freq=33.333e6, with_led_chaser=True, **kwargs):
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platform = jungle_electronics_fireant.Platform()
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platform.add_extension(serial)
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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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# Disable Integrated ROM since too large for this device.
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kwargs["integrated_rom_size"] = 0
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# Set CPU variant / reset address
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if kwargs.get("cpu_type", "vexriscv") == "vexriscv":
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kwargs["cpu_variant"] = "minimal"
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SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Jungle Electronics FireAnt", **kwargs)
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# SPI Flash --------------------------------------------------------------------------------
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from litespi.modules import W25Q80BV
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from litespi.opcodes import SpiNorFlashOpCodes as Codes
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# Board is using W25Q80DV, which is replacemenet for W25Q80BV
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self.add_spi_flash(name="spiflash", mode="1x", module=W25Q80BV(Codes.READ_1_1_1), with_master=False)
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# Add ROM linker region --------------------------------------------------------------------
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self.bus.add_region("rom", SoCRegion(
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origin = self.bus.regions["spiflash"].origin + bios_flash_offset,
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size = 32 * KILOBYTE,
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linker = True)
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)
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self.cpu.set_reset_address(self.bus.regions["rom"].origin)
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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=jungle_electronics_fireant.Platform, description="LiteX SoC on Jungle Electronics FireAnt.")
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parser.add_target_argument("--flash", action="store_true", help="Flash Bitstream.")
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parser.add_target_argument("--sys-clk-freq", default=33.333e6, type=float, help="System clock frequency.")
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parser.add_target_argument("--bios-flash-offset", default="0x40000", help="BIOS offset in SPI Flash.")
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args = parser.parse_args()
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soc = BaseSoC(
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bios_flash_offset = int(args.bios_flash_offset, 0),
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sys_clk_freq = args.sys_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"))
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if args.flash:
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prog = soc.platform.create_programmer()
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prog.flash(0, builder.get_bitstream_filename(mode="flash", ext=".hex")) # FIXME
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prog.flash(args.bios_flash_offset, builder.get_bios_filename())
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if __name__ == "__main__":
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main()
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