litex-boards/litex_boards/targets/terasic_deca.py

109 lines
4.3 KiB
Python
Executable File

#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2019 msloniewski <marcin.sloniewski@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause
import os
import argparse
from migen import *
from litex_boards.platforms import deca
from litex.soc.cores.clock import Max10PLL
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *
from litex.soc.cores.video import VideoDVIPHY
from litex.soc.cores.led import LedChaser
from litex.soc.cores.bitbang import I2CMaster
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform, sys_clk_freq, with_usb_pll=False):
self.rst = Signal()
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_hdmi = ClockDomain()
self.clock_domains.cd_usb = ClockDomain()
# # #
# Clk / Rst.
clk50 = platform.request("clk50")
# PLL
self.submodules.pll = pll = Max10PLL(speedgrade="-6")
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(clk50, 50e6)
pll.create_clkout(self.cd_sys, sys_clk_freq)
pll.create_clkout(self.cd_hdmi, 40e6)
# USB PLL.
if with_usb_pll:
ulpi = platform.request("ulpi")
self.comb += ulpi.cs.eq(1) # Enable ULPI chip to enable the ULPI clock.
self.submodules.usb_pll = pll = Max10PLL(speedgrade="-6")
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(ulpi.clk, 60e6)
pll.create_clkout(self.cd_usb, 60e6, phase=-120) # -120° from DECA's example (also validated with LUNA).
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=int(50e6), with_led_chaser=True, with_video_terminal=False,
**kwargs):
self.platform = platform = deca.Platform()
# Defaults to JTAG-UART since no hardware UART.
if kwargs["uart_name"] == "serial":
kwargs["uart_name"] = "jtag_atlantic"
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on Terasic DECA",
ident_version = True,
**kwargs)
# CRG --------------------------------------------------------------------------------------
self.submodules.crg = self.crg = _CRG(platform, sys_clk_freq, with_usb_pll=False)
# Video ------------------------------------------------------------------------------------
if with_video_terminal:
self.submodules.videophy = VideoDVIPHY(platform.request("hdmi"), clock_domain="hdmi")
self.add_video_terminal(phy=self.videophy, timings="800x600@60Hz", clock_domain="hdmi")
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.submodules.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
# Build --------------------------------------------------------------------------------------------
def main():
parser = argparse.ArgumentParser(description="LiteX SoC on DECA")
parser.add_argument("--build", action="store_true", help="Build bitstream.")
parser.add_argument("--load", action="store_true", help="Load bitstream.")
parser.add_argument("--sys-clk-freq", default=50e6, help="System clock frequency.")
parser.add_argument("--with-video-terminal", action="store_true", help="Enable Video Terminal (VGA).")
builder_args(parser)
soc_core_args(parser)
args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq = int(float(args.sys_clk_freq)),
with_video_terminal = args.with_video_terminal,
**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 + ".sof"))
if __name__ == "__main__":
main()