litex-boards/litex_boards/targets/machdyne_krote.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# Copyright (c) 2021 Omkar Bhilare <ombhilare999@gmail.com>
# Copyright (c) 2021 Michael Welling <mwelling@ieee.org>
# Copyright (c) 2022 Lone Dynamics Corporation <info@lonedynamics.com>
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Krote FPGA board: https://github.com/machdyne/krote
#
# TODO:
# - add support for QQSPI PSRAM (32MB) pmod
# - add support for SD card pmod
#
import os
import sys
from migen import *
from litex.gen import *
from litex.build.io import CRG
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from litex_boards.platforms import machdyne_krote
from litex.soc.integration.soc_core import *
from litex.soc.integration.soc import SoCRegion
from litex.soc.integration.builder import *
from litex.soc.cores.clock import iCE40PLL
from litex.soc.cores.led import LedChaser
from migen.genlib.resetsync import AsyncResetSynchronizer
kB = 1024
mB = 1024*kB
# _CRG ---------------------------------------------------------------------------------------------
class _CRG(LiteXModule):
def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.cd_sys = ClockDomain()
self.cd_por = ClockDomain(reset_less=True)
# Clk/Rst
clk100 = platform.request("clk100")
platform.add_period_constraint(clk100, 1e9/100e6)
# Power On Reset
por_count = Signal(16, reset=2**16-1)
por_done = Signal()
self.comb += self.cd_por.clk.eq(clk100)
self.comb += por_done.eq(por_count == 0)
self.sync.por += If(~por_done, por_count.eq(por_count - 1))
# Sys Clk
self.pll = pll = iCE40PLL()
pll.register_clkin(clk100, 100e6)
pll.create_clkout(self.cd_sys, sys_clk_freq, with_reset=False)
self.specials += AsyncResetSynchronizer(self.cd_sys, ~por_done | ~pll.locked)
platform.add_period_constraint(self.cd_sys.clk, 1e9/sys_clk_freq)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
mem_map = {**SoCCore.mem_map, **{"spiflash": 0x20000000}}
def __init__(self, bios_flash_offset, sys_clk_freq=100e6, with_led_chaser=True, **kwargs):
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platform = machdyne_krote.Platform()
# Disable Integrated ROM since too large for iCE40.
kwargs["integrated_rom_size"] = 0
kwargs["integrated_sram_size"] = 4*kB
# Set CPU variant / reset address
kwargs["cpu_reset_address"] = self.mem_map["spiflash"] + bios_flash_offset
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on Kr\xf6te",
**kwargs)
# CRG --------------------------------------------------------------------------------------
self.crg = _CRG(platform, sys_clk_freq)
# SPI Flash --------------------------------------------------------------------------------
from litespi.modules import W25Q32
from litespi.opcodes import SpiNorFlashOpCodes as Codes
self.add_spi_flash(mode="1x", module=W25Q32(Codes.READ_1_1_1), with_master=False)
# Add ROM linker region --------------------------------------------------------------------
self.bus.add_region("rom", SoCRegion(
origin = self.mem_map["spiflash"] + bios_flash_offset,
size = 32*kB,
linker = True)
)
# 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=machdyne_krote.Platform, description="LiteX SoC on Kr\xf6te.")
parser.add_argument("--bios-flash-offset", default="0x021000", help="BIOS offset in SPI Flash (default: 0x21000)")
parser.add_argument("--sys-clk-freq", default=50e6, type=float, help="System clock frequency (default: 50MHz)")
parser.add_argument("--with-led-chaser", action="store_true", help="Enable LED Chaser.")
args = parser.parse_args()
soc = BaseSoC(
bios_flash_offset = int(args.bios_flash_offset, 0),
sys_clk_freq = args.sys_clk_freq,
**parser.soc_argdict
)
builder = Builder(soc, **parser.builder_argdict)
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if args.build:
builder.build(**parser.toolchain_argdict)
if __name__ == "__main__":
main()