litex-boards/litex_boards/targets/fpgawars_alhambra2.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2022 JM Robles <roblesjm@gmail.com>
# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex.gen import LiteXModule
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from litex_boards.platforms import fpgawars_alhambra2
from litex.build.lattice.programmer import IceStormProgrammer
from litex.soc.integration.soc_core import *
from litex.soc.integration.soc import SoCRegion
from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser
kB = 1024
mB = 1024*kB
class _CRG(LiteXModule):
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def __init__(self, platform, sys_clk_freq):
assert sys_clk_freq == 12e6
self.rst = Signal()
self.cd_sys = ClockDomain()
self.cd_por = ClockDomain()
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sys = platform.request("clk12")
platform.add_period_constraint(sys, 1e9/12e6)
# Power on reset
por_count = Signal(16, reset=2**16-1)
por_done = Signal()
self.comb += self.cd_por.clk.eq(ClockSignal("sys"))
self.comb += por_done.eq(por_count == 0)
self.sync.por += If(~por_done, por_count.eq(por_count -1))
# Sys clk
self.comb += self.cd_sys.clk.eq(sys)
self.specials += AsyncResetSynchronizer(self.cd_sys, ~por_done)
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=int(12e6), with_led_chaser=True, bios_flash_offset=0x50000, **kwargs):
platform = fpgawars_alhambra2.Platform()
kwargs["integrated_rom_size"] = 0
# SoC
SoCCore.__init__(self, platform, sys_clk_freq, ident='Litex on Alhambra II', **kwargs)
# SPI Flash
from litespi.modules import N25Q032A
from litespi.opcodes import SpiNorFlashOpCodes as Codes
self.add_spi_flash(mode='1x', module=N25Q032A(Codes.READ_1_1_1), with_master=False)
self.bus.add_region("rom", SoCRegion(
origin=self.bus.regions["spiflash"].origin + bios_flash_offset,
size=32*kB,
linker=True
))
self.cpu.set_reset_address(self.bus.regions["rom"].origin)
# CRG
self.crg = _CRG(platform, sys_clk_freq)
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# Leds
if with_led_chaser:
self.leds = LedChaser(pads=platform.request_all("user_leds"), sys_clk_freq=sys_clk_freq)
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def main():
from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=fpgawars_alhambra2.Platform, description="LiteX SoC on Lattice iCE40UP5k EVN breakout board")
parser.add_target_argument("--sys-clk-freq", default=12e6, help="System clock frequency.")
parser.add_target_argument("--bios-flash-offset", default="0x50000", help="BIOS offset in SPI flash")
parser.add_target_argument("--flash", action="store_true", help="Flash Bitstream.")
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args = parser.parse_args()
soc = BaseSoC(
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bios_flash_offset = int(args.bios_flash_offset, 0),
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sys_clk_freq = int(float(args.sys_clk_freq)),
**parser.soc_core_argdict
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)
builder = Builder(soc, **parser.builder_argdict)
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if args.build:
builder.build(**parser.toolchain_argdict)
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if args.flash:
flash(args.bios_flash_offset)
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if __name__ == "__main__":
main()