#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2021 Florent Kermarrec # SPDX-License-Identifier: BSD-2-Clause from migen import * from migen.genlib.resetsync import AsyncResetSynchronizer from litex.soc.cores.clock.gowin_gw1n import GW1NPLL 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 from litex.soc.cores.video import * from litex_boards.platforms import tang_nano_4k from litex.soc.cores.hyperbus import HyperRAM kB = 1024 mB = 1024*kB # CRG ---------------------------------------------------------------------------------------------- class _CRG(Module): def __init__(self, platform, sys_clk_freq, with_video_pll=False): self.rst = Signal() self.clock_domains.cd_sys = ClockDomain() # # # # Clk / Rst clk27 = platform.request("clk27") rst_n = platform.request("user_btn", 0) # PLL self.submodules.pll = pll = GW1NPLL(devicename=platform.devicename, device=platform.device) self.comb += pll.reset.eq(~rst_n) pll.register_clkin(clk27, 27e6) pll.create_clkout(self.cd_sys, sys_clk_freq) # Video PLL if with_video_pll: self.submodules.video_pll = video_pll = GW1NPLL(devicename=platform.devicename, device=platform.device) self.comb += video_pll.reset.eq(~rst_n) video_pll.register_clkin(clk27, 27e6) self.clock_domains.cd_hdmi = ClockDomain() self.clock_domains.cd_hdmi5x = ClockDomain() video_pll.create_clkout(self.cd_hdmi5x, 125e6) self.specials += Instance("CLKDIV", p_DIV_MODE= "5", i_RESETN = rst_n, i_HCLKIN = self.cd_hdmi5x.clk, o_CLKOUT = self.cd_hdmi.clk ) # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): def __init__(self, sys_clk_freq=int(27e6), with_hyperram=False, with_led_chaser=True, with_video_terminal=True, **kwargs): platform = tang_nano_4k.Platform() # CRG -------------------------------------------------------------------------------------- self.submodules.crg = _CRG(platform, sys_clk_freq, with_video_pll=with_video_terminal) # SoCCore ---------------------------------------------------------------------------------- if "cpu_type" in kwargs and kwargs["cpu_type"] == "gowin_emcu": kwargs["with_uart"] = False # CPU has own UART kwargs["integrated_sram_size"] = 0 # SRAM is directly attached to CPU kwargs["integrated_rom_size"] = 0 # boot flash directly attached to CPU else: # Disable Integrated ROM kwargs["integrated_rom_size"] = 0 SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Tang Nano 4K", **kwargs) if self.cpu_type == 'vexriscv': assert self.cpu_variant == 'minimal', 'use --cpu-variant=minimal to fit into number of BSRAMs' # Gowin EMCU Integration ------------------------------------------------------------------- if self.cpu_type == "gowin_emcu": self.cpu.connect_uart(platform.request("serial")) self.bus.add_region("sram", SoCRegion( origin=self.cpu.mem_map["sram"], size=16 * kB) ) self.bus.add_region("rom", SoCRegion( origin=self.cpu.mem_map["rom"], size=32 * kB, linker=True) ) else: # 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.bus.regions["spiflash"].origin, size = 32*kB, linker = True) ) self.cpu.set_reset_address(self.bus.regions["rom"].origin) # HyperRAM --------------------------------------------------------------------------------- if with_hyperram: class HyperRAMPads: def __init__(self): self.clk = Signal() self.rst_n = platform.request("O_hpram_reset_n") self.dq = platform.request("IO_hpram_dq") self.cs_n = platform.request("O_hpram_cs_n") self.rwds = platform.request("IO_hpram_rwds") hyperram_pads = HyperRAMPads() self.comb += platform.request("O_hpram_ck").eq(hyperram_pads.clk) self.comb += platform.request("O_hpram_ck_n").eq(~hyperram_pads.clk) self.submodules.hyperram = HyperRAM(hyperram_pads) self.bus.add_slave("main_ram", slave=self.hyperram.bus, region=SoCRegion(origin=0x40000000, size=8*mB)) # Video ------------------------------------------------------------------------------------ if with_video_terminal: self.submodules.videophy = VideoHDMIPHY(platform.request("hdmi"), clock_domain="hdmi") self.add_video_colorbars(phy=self.videophy, timings="640x480@75Hz", clock_domain="hdmi") #self.add_video_terminal(phy=self.videophy, timings="640x480@75Hz", clock_domain="hdmi") # FIXME: Free up BRAMs. # Leds ------------------------------------------------------------------------------------- if with_led_chaser: self.submodules.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq) # Build -------------------------------------------------------------------------------------------- def main(): from litex.soc.integration.soc import LiteXSoCArgumentParser parser = LiteXSoCArgumentParser(description="LiteX SoC on Tang Nano 4K") target_group = parser.add_argument_group(title="Target options") target_group.add_argument("--build", action="store_true", help="Build bitstream.") target_group.add_argument("--load", action="store_true", help="Load bitstream.") target_group.add_argument("--flash", action="store_true", help="Flash Bitstream.") target_group.add_argument("--sys-clk-freq",default=27e6, help="System clock frequency.") builder_args(parser) soc_core_args(parser) args = parser.parse_args() soc = BaseSoC( 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(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")) # FIXME prog.flash(0, builder.get_bios_filename(), external=True) if __name__ == "__main__": main()