litex-boards/litex_boards/targets/tinyfpga_bx.py

87 lines
3.1 KiB
Python
Raw Normal View History

#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
import os
import sys
import argparse
from migen import *
from litex.build.io import CRG
from litex_boards.platforms import tinyfpga_bx
from litex.soc.cores.spi_flash import SpiFlash
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
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
mem_map = {**SoCCore.mem_map, **{"spiflash": 0x80000000}}
def __init__(self, bios_flash_offset, sys_clk_freq=int(16e6), **kwargs):
platform = tinyfpga_bx.Platform()
# Disable Integrated ROM since too large for iCE40.
kwargs["integrated_rom_size"] = 0
# 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 TinyFPGA BX",
ident_version = True,
**kwargs)
# CRG --------------------------------------------------------------------------------------
self.submodules.crg = CRG(platform.request("clk16"))
# SPI Flash --------------------------------------------------------------------------------
self.add_spi_flash(mode="1x", dummy_cycles=8)
# Add ROM linker region --------------------------------------------------------------------
self.bus.add_region("rom", SoCRegion(
origin = self.mem_map["spiflash"] + bios_flash_offset,
size = 32*kB,
linker = True)
)
# Leds -------------------------------------------------------------------------------------
self.submodules.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
self.add_csr("leds")
# Build --------------------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on TinyFPGA BX")
parser.add_argument("--build", action="store_true", help="Build bitstream")
parser.add_argument("--bios-flash-offset", default=0x60000, help="BIOS offset in SPI Flash (default: 0x60000)")
parser.add_argument("--sys-clk-freq", default=16e6, help="System clock frequency (default: 16MHz)")
builder_args(parser)
soc_core_args(parser)
args = parser.parse_args()
soc = BaseSoC(
bios_flash_offset = args.bios_flash_offset,
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 __name__ == "__main__":
main()