litex-boards/litex_boards/targets/muselab_icesugar.py

143 lines
5.6 KiB
Python
Executable File

#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2021 Hans Baier <hansfbaier@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause
# iCESugar FPGA: https://www.aliexpress.com/item/4001201771358.html
import os
import argparse
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex_boards.platforms import muselab_icesugar
from litex.soc.cores.ram import Up5kSPRAM
from litex.soc.cores.clock import iCE40PLL
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
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_por = ClockDomain(reset_less=True)
# # #
# Clk/Rst
clk12 = platform.request("clk12")
# Power On Reset
por_count = Signal(16, reset=2**16-1)
por_done = Signal()
self.comb += self.cd_por.clk.eq(ClockSignal())
self.comb += por_done.eq(por_count == 0)
self.sync.por += If(~por_done, por_count.eq(por_count - 1))
# PLL
self.submodules.pll = pll = iCE40PLL(primitive="SB_PLL40_PAD")
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(clk12, 12e6)
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):
def __init__(self, bios_flash_offset, sys_clk_freq=int(24e6), with_led_chaser=True,
with_video_terminal=False, **kwargs):
platform = muselab_icesugar.Platform()
# Disable Integrated ROM/SRAM since too large for iCE40 and UP5K has specific SPRAM.
kwargs["integrated_sram_size"] = 0
kwargs["integrated_rom_size"] = 0
# Set CPU variant
if kwargs.get("cpu_type", "vexriscv") == "vexriscv":
kwargs["cpu_variant"] = "lite"
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on Muselab iCESugar",
ident_version = True,
**kwargs)
# CRG --------------------------------------------------------------------------------------
self.submodules.crg = _CRG(platform, sys_clk_freq)
# 128KB SPRAM (used as SRAM) ---------------------------------------------------------------
self.submodules.spram = Up5kSPRAM(size=64*kB)
self.bus.add_slave("sram", self.spram.bus, SoCRegion(size=64*kB))
# SPI Flash --------------------------------------------------------------------------------
from litespi.modules import W25Q64FV
from litespi.opcodes import SpiNorFlashOpCodes as Codes
self.add_spi_flash(mode="1x", module=W25Q64FV(Codes.READ_1_1_1), with_master=False)
# Add ROM linker region --------------------------------------------------------------------
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)
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
led_pads = platform.request_all("user_led_n")
self.submodules.leds = LedChaser(
pads = led_pads,
sys_clk_freq = sys_clk_freq)
# Flash --------------------------------------------------------------------------------------------
def flash(bios_flash_offset):
from litex.build.lattice.programmer import IceSugarProgrammer
prog = IceSugarProgrammer()
prog.flash(bios_flash_offset, "build/muselab_icesugar/software/bios/bios.bin")
prog.flash(0x00000000, "build/muselab_icesugar/gateware/muselab_icesugar.bin")
# Build --------------------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on iCEBreaker")
parser.add_argument("--build", action="store_true", help="Build bitstream.")
parser.add_argument("--load", action="store_true", help="Load bitstream.")
parser.add_argument("--flash", action="store_true", help="Flash Bitstream.")
parser.add_argument("--sys-clk-freq", default=24e6, help="System clock frequency.")
parser.add_argument("--bios-flash-offset", default="0x40000", help="BIOS offset in SPI Flash.")
builder_args(parser)
soc_core_args(parser)
args = parser.parse_args()
soc = BaseSoC(
bios_flash_offset = int(args.bios_flash_offset, 0),
sys_clk_freq = int(float(args.sys_clk_freq)),
**soc_core_argdict(args)
)
builder = Builder(soc, **builder_argdict(args))
builder.build(run=args.build)
if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bin"))
if args.flash:
flash(int(args.bios_flash_offset, 0))
if __name__ == "__main__":
main()