201 lines
8.6 KiB
Python
Executable File
201 lines
8.6 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
#
|
|
# This file is part of LiteX-Boards.
|
|
#
|
|
# Copyright (c) 2022 Icenowy Zheng <icenowy@aosc.io>
|
|
# Copyright (c) 2022 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 *
|
|
|
|
from litex.build.io import DDROutput
|
|
|
|
from litex.soc.cores.clock.gowin_gw2a import GW2APLL
|
|
from litex.soc.integration.soc_core import *
|
|
from litex.soc.integration.soc import SoCRegion
|
|
from litex.soc.integration.builder import *
|
|
from litex.soc.cores.gpio import GPIOIn
|
|
from litex.soc.cores.led import LedChaser, WS2812
|
|
from litex.soc.cores.video import VideoGowinHDMIPHY
|
|
|
|
from litedram.modules import M12L64322A # FIXME: use the real model number
|
|
from litedram.phy import GENSDRPHY
|
|
|
|
from litex_boards.platforms import sipeed_tang_nano_20k
|
|
|
|
# CRG ----------------------------------------------------------------------------------------------
|
|
|
|
class _CRG(LiteXModule):
|
|
def __init__(self, platform, sys_clk_freq, with_hdmi=False):
|
|
self.rst = Signal()
|
|
self.cd_sys = ClockDomain()
|
|
self.cd_por = ClockDomain()
|
|
if with_hdmi:
|
|
self.cd_hdmi = ClockDomain()
|
|
self.cd_hdmi5x = ClockDomain()
|
|
|
|
# Clk
|
|
clk27 = platform.request("clk27")
|
|
|
|
# Power on reset
|
|
por_count = Signal(16, reset=2**16-1)
|
|
por_done = Signal()
|
|
self.comb += self.cd_por.clk.eq(clk27)
|
|
self.comb += por_done.eq(por_count == 0)
|
|
self.sync.por += If(~por_done, por_count.eq(por_count - 1))
|
|
|
|
# PLL
|
|
self.pll = pll = GW2APLL(devicename=platform.devicename, device=platform.device)
|
|
self.comb += pll.reset.eq(~por_done)
|
|
pll.register_clkin(clk27, 27e6)
|
|
pll.create_clkout(self.cd_sys, sys_clk_freq)
|
|
|
|
# HDMI PLL
|
|
if with_hdmi:
|
|
self.video_pll = video_pll = GW2APLL(devicename=platform.devicename, device=platform.device)
|
|
video_pll.register_clkin(clk27, 27e6)
|
|
video_pll.create_clkout(self.cd_hdmi5x, 125e6, margin=1e-2)
|
|
self.specials += Instance("CLKDIV",
|
|
p_DIV_MODE = "5",
|
|
i_RESETN = 1, # Disable reset signal.
|
|
i_CALIB = 0, # No calibration.
|
|
i_HCLKIN = self.cd_hdmi5x.clk,
|
|
o_CLKOUT = self.cd_hdmi.clk
|
|
)
|
|
|
|
# BaseSoC ------------------------------------------------------------------------------------------
|
|
|
|
class BaseSoC(SoCCore):
|
|
def __init__(self, toolchain="gowin", sys_clk_freq=48e6,
|
|
with_led_chaser = True,
|
|
with_rgb_led = False,
|
|
with_buttons = True,
|
|
with_spi_flash = False,
|
|
with_video_terminal = False,
|
|
with_video_colorbars = False,
|
|
**kwargs):
|
|
|
|
platform = sipeed_tang_nano_20k.Platform(toolchain=toolchain)
|
|
|
|
with_hdmi = with_video_terminal or with_video_colorbars
|
|
|
|
# CRG --------------------------------------------------------------------------------------
|
|
self.crg = _CRG(platform, sys_clk_freq, with_hdmi=with_hdmi)
|
|
|
|
# SoCCore ----------------------------------------------------------------------------------
|
|
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Tang Nano 20K", **kwargs)
|
|
|
|
# SPI Flash: XT25F64B ----------------------------------------------------------------------
|
|
if with_spi_flash:
|
|
from litespi.modules import W25Q64 as SpiFlashModule # compatible with XT25F64B
|
|
from litespi.opcodes import SpiNorFlashOpCodes as Codes
|
|
self.add_spi_flash(mode="1x", module=SpiFlashModule(Codes.READ_1_1_1))
|
|
|
|
# SDR SDRAM --------------------------------------------------------------------------------
|
|
if not self.integrated_main_ram_size:
|
|
class SDRAMPads:
|
|
def __init__(self):
|
|
self.clk = platform.request("O_sdram_clk")
|
|
self.cke = platform.request("O_sdram_cke")
|
|
self.cs_n = platform.request("O_sdram_cs_n")
|
|
self.cas_n = platform.request("O_sdram_cas_n")
|
|
self.ras_n = platform.request("O_sdram_ras_n")
|
|
self.we_n = platform.request("O_sdram_wen_n")
|
|
self.dm = platform.request("O_sdram_dqm")
|
|
self.a = platform.request("O_sdram_addr")
|
|
self.ba = platform.request("O_sdram_ba")
|
|
self.dq = platform.request("IO_sdram_dq")
|
|
sdram_pads = SDRAMPads()
|
|
|
|
self.specials += DDROutput(0, 1, sdram_pads.clk, ClockSignal("sys"))
|
|
|
|
self.sdrphy = GENSDRPHY(sdram_pads, sys_clk_freq)
|
|
self.add_sdram("sdram",
|
|
phy = self.sdrphy,
|
|
module = M12L64322A(sys_clk_freq, "1:1"), # FIXME.
|
|
l2_cache_size = 128,
|
|
)
|
|
|
|
# Video ------------------------------------------------------------------------------------
|
|
if with_hdmi:
|
|
self.videophy = VideoGowinHDMIPHY(platform.request("hdmi"), clock_domain="hdmi")
|
|
if with_video_terminal:
|
|
# self.add_video_terminal(phy=self.videophy, timings="800x600@60Hz", clock_domain="hdmi")
|
|
self.add_video_terminal(phy=self.videophy, timings="640x480@60Hz", clock_domain="hdmi")
|
|
if with_video_colorbars:
|
|
self.add_video_colorbars(phy=self.videophy, timings="800x600@60Hz", clock_domain="hdmi")
|
|
|
|
# Leds -------------------------------------------------------------------------------------
|
|
if with_led_chaser:
|
|
self.leds = LedChaser(
|
|
pads = platform.request_all("led_n"),
|
|
sys_clk_freq = sys_clk_freq
|
|
)
|
|
|
|
# RGB Led ----------------------------------------------------------------------------------
|
|
if with_rgb_led:
|
|
self.rgb_led = WS2812(
|
|
pad = platform.request("rgb_led"),
|
|
nleds = 1,
|
|
sys_clk_freq = sys_clk_freq
|
|
)
|
|
self.bus.add_slave(name="rgb_led", slave=self.rgb_led.bus, region=SoCRegion(
|
|
origin = 0x2000_0000,
|
|
size = 4,
|
|
))
|
|
|
|
# Buttons ----------------------------------------------------------------------------------
|
|
if with_buttons:
|
|
self.buttons = GPIOIn(pads=~platform.request_all("btn"))
|
|
|
|
|
|
# Build --------------------------------------------------------------------------------------------
|
|
|
|
def main():
|
|
from litex.build.parser import LiteXArgumentParser
|
|
parser = LiteXArgumentParser(platform=sipeed_tang_nano_20k.Platform, description="LiteX SoC on Tang Nano 20K.")
|
|
parser.add_target_argument("--flash", action="store_true", help="Flash Bitstream.")
|
|
parser.add_target_argument("--sys-clk-freq", default=48e6, type=float, help="System clock frequency.")
|
|
parser.add_target_argument("--with-spi-flash", action="store_true", help="Enable SPI Flash (MMAPed).")
|
|
parser.add_target_argument("--with-rbg-led", action="store_true", help="Enable WS2812 RGB Led.")
|
|
sdopts = parser.target_group.add_mutually_exclusive_group()
|
|
sdopts.add_argument("--with-spi-sdcard", action="store_true", help="Enable SPI-mode SDCard support.")
|
|
sdopts.add_argument("--with-sdcard", action="store_true", help="Enable SDCard support.")
|
|
viopts = parser.target_group.add_mutually_exclusive_group()
|
|
viopts.add_argument("--with-video-terminal", action="store_true", help="Enable Video Terminal (HDMI).")
|
|
viopts.add_argument("--with-video-colorbars", action="store_true", help="Enable Video Colorbars (HDMI).")
|
|
args = parser.parse_args()
|
|
|
|
soc = BaseSoC(
|
|
toolchain = args.toolchain,
|
|
sys_clk_freq = args.sys_clk_freq,
|
|
with_rgb_led = args.with_rbg_led,
|
|
with_spi_flash = args.with_spi_flash,
|
|
with_video_terminal = args.with_video_terminal,
|
|
with_video_colorbars = args.with_video_colorbars,
|
|
**parser.soc_argdict
|
|
)
|
|
if args.with_spi_sdcard:
|
|
soc.add_spi_sdcard()
|
|
if args.with_sdcard:
|
|
soc.add_sdcard()
|
|
|
|
builder = Builder(soc, **parser.builder_argdict)
|
|
if args.build:
|
|
builder.build(**parser.toolchain_argdict)
|
|
|
|
if args.load:
|
|
prog = soc.platform.create_programmer()
|
|
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
|
|
|
|
if args.flash:
|
|
prog = soc.platform.create_programmer()
|
|
prog.flash(0, builder.get_bitstream_filename(mode="flash", ext=".fs"), external=True)
|
|
|
|
if __name__ == "__main__":
|
|
main()
|