#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2018-2019 Florent Kermarrec # Copyright (c) 2018 David Shah # SPDX-License-Identifier: BSD-2-Clause from migen import * from migen.genlib.resetsync import AsyncResetSynchronizer from litex.build.io import DDROutput from litex_boards.platforms import ulx3s from litex.build.lattice.trellis import trellis_args, trellis_argdict from litex.soc.cores.clock import * from litex.soc.integration.soc_core import * from litex.soc.integration.builder import * from litex.soc.cores.video import VideoHDMIPHY from litex.soc.cores.led import LedChaser from litex.soc.cores.spi import SPIMaster from litex.soc.cores.gpio import GPIOOut from litedram import modules as litedram_modules from litedram.phy import GENSDRPHY, HalfRateGENSDRPHY # CRG ---------------------------------------------------------------------------------------------- class _CRG(Module): def __init__(self, platform, sys_clk_freq, with_usb_pll=False, with_video_pll=False, sdram_rate="1:1"): self.rst = Signal() self.clock_domains.cd_sys = ClockDomain() if sdram_rate == "1:2": self.clock_domains.cd_sys2x = ClockDomain() self.clock_domains.cd_sys2x_ps = ClockDomain(reset_less=True) else: self.clock_domains.cd_sys_ps = ClockDomain(reset_less=True) # # # # Clk / Rst clk25 = platform.request("clk25") rst = platform.request("rst") # PLL self.submodules.pll = pll = ECP5PLL() self.comb += pll.reset.eq(rst | self.rst) pll.register_clkin(clk25, 25e6) pll.create_clkout(self.cd_sys, sys_clk_freq) if sdram_rate == "1:2": pll.create_clkout(self.cd_sys2x, 2*sys_clk_freq) pll.create_clkout(self.cd_sys2x_ps, 2*sys_clk_freq, phase=180) # Idealy 90° but needs to be increased. else: pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=90) # USB PLL if with_usb_pll: self.submodules.usb_pll = usb_pll = ECP5PLL() self.comb += usb_pll.reset.eq(rst | self.rst) usb_pll.register_clkin(clk25, 25e6) self.clock_domains.cd_usb_12 = ClockDomain() self.clock_domains.cd_usb_48 = ClockDomain() usb_pll.create_clkout(self.cd_usb_12, 12e6, margin=0) usb_pll.create_clkout(self.cd_usb_48, 48e6, margin=0) # Video PLL if with_video_pll: self.submodules.video_pll = video_pll = ECP5PLL() self.comb += video_pll.reset.eq(rst | self.rst) video_pll.register_clkin(clk25, 25e6) self.clock_domains.cd_hdmi = ClockDomain() self.clock_domains.cd_hdmi5x = ClockDomain() video_pll.create_clkout(self.cd_hdmi, 25e6, margin=0) video_pll.create_clkout(self.cd_hdmi5x, 125e6, margin=0) # SDRAM clock sdram_clk = ClockSignal("sys2x_ps" if sdram_rate == "1:2" else "sys_ps") self.specials += DDROutput(1, 0, platform.request("sdram_clock"), sdram_clk) # Prevent ESP32 from resetting FPGA self.comb += platform.request("wifi_gpio0").eq(1) # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): def __init__(self, device="LFE5U-45F", revision="2.0", toolchain="trellis", sys_clk_freq=int(50e6), sdram_module_cls="MT48LC16M16", sdram_rate="1:1", with_led_chaser=True, with_video_terminal=False, with_video_framebuffer=False, with_spi_flash=False, **kwargs): platform = ulx3s.Platform(device=device, revision=revision, toolchain=toolchain) # SoCCore ---------------------------------------------------------------------------------- SoCCore.__init__(self, platform, sys_clk_freq, ident = "LiteX SoC on ULX3S", **kwargs) # CRG -------------------------------------------------------------------------------------- with_usb_pll = kwargs.get("uart_name", None) == "usb_acm" with_video_pll = with_video_terminal or with_video_framebuffer self.submodules.crg = _CRG(platform, sys_clk_freq, with_usb_pll, with_video_pll, sdram_rate=sdram_rate) # SDR SDRAM -------------------------------------------------------------------------------- if not self.integrated_main_ram_size: sdrphy_cls = HalfRateGENSDRPHY if sdram_rate == "1:2" else GENSDRPHY self.submodules.sdrphy = sdrphy_cls(platform.request("sdram"), sys_clk_freq) self.add_sdram("sdram", phy = self.sdrphy, module = getattr(litedram_modules, sdram_module_cls)(sys_clk_freq, sdram_rate), size = 0x40000000, l2_cache_size = kwargs.get("l2_size", 8192) ) # Video ------------------------------------------------------------------------------------ if with_video_terminal or with_video_framebuffer: self.submodules.videophy = VideoHDMIPHY(platform.request("gpdi"), clock_domain="hdmi") if with_video_terminal: self.add_video_terminal(phy=self.videophy, timings="640x480@75Hz", clock_domain="hdmi") if with_video_framebuffer: self.add_video_framebuffer(phy=self.videophy, timings="640x480@75Hz", clock_domain="hdmi") # SPI Flash -------------------------------------------------------------------------------- if with_spi_flash: from litespi.modules import IS25LP128 from litespi.opcodes import SpiNorFlashOpCodes as Codes self.add_spi_flash(mode="4x", module=IS25LP128(Codes.READ_1_1_4)) # Leds ------------------------------------------------------------------------------------- if with_led_chaser: self.submodules.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq) def add_oled(self): pads = self.platform.request("oled_spi") pads.miso = Signal() self.submodules.oled_spi = SPIMaster(pads, 8, self.sys_clk_freq, 8e6) self.oled_spi.add_clk_divider() self.submodules.oled_ctl = GPIOOut(self.platform.request("oled_ctl")) # Build -------------------------------------------------------------------------------------------- def main(): from litex.soc.integration.soc import LiteXSoCArgumentParser parser = LiteXSoCArgumentParser(description="LiteX SoC on ULX3S") 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("--toolchain", default="trellis", help="FPGA toolchain (trellis or diamond).") target_group.add_argument("--device", default="LFE5U-45F", help="FPGA device (LFE5U-12F, LFE5U-25F, LFE5U-45F or LFE5U-85F).") target_group.add_argument("--revision", default="2.0", help="Board revision (2.0 or 1.7).") target_group.add_argument("--sys-clk-freq", default=50e6, help="System clock frequency.") target_group.add_argument("--sdram-module", default="MT48LC16M16", help="SDRAM module (MT48LC16M16, AS4C32M16 or AS4C16M16).") target_group.add_argument("--with-spi-flash", action="store_true", help="Enable SPI Flash (MMAPed).") sdopts = 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.") target_group.add_argument("--with-oled", action="store_true", help="Enable SDD1331 OLED support.") target_group.add_argument("--sdram-rate", default="1:1", help="SDRAM Rate (1:1 Full Rate or 1:2 Half Rate).") viopts = 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-framebuffer", action="store_true", help="Enable Video Framebuffer (HDMI).") builder_args(parser) soc_core_args(parser) trellis_args(parser) args = parser.parse_args() soc = BaseSoC( device = args.device, revision = args.revision, toolchain = args.toolchain, sys_clk_freq = int(float(args.sys_clk_freq)), sdram_module_cls = args.sdram_module, sdram_rate = args.sdram_rate, with_video_terminal = args.with_video_terminal, with_video_framebuffer = args.with_video_framebuffer, with_spi_flash = args.with_spi_flash, **soc_core_argdict(args)) if args.with_spi_sdcard: soc.add_spi_sdcard() if args.with_sdcard: soc.add_sdcard() if args.with_oled: soc.add_oled() builder = Builder(soc, **builder_argdict(args)) builder_kargs = trellis_argdict(args) if args.toolchain == "trellis" else {} builder.build(**builder_kargs, run=args.build) if args.load: prog = soc.platform.create_programmer() prog.load_bitstream(builder.get_bitstream_filename(mode="sram", ext=".svf")) # FIXME if __name__ == "__main__": main()