#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2019 Sean Cross # Copyright (c) 2018 David Shah # Copyright (c) 2020 Florent Kermarrec # SPDX-License-Identifier: BSD-2-Clause import os import sys import argparse from migen import * from migen.genlib.resetsync import AsyncResetSynchronizer from litex_boards.platforms import fomu_pvt from litex.soc.cores.up5kspram import Up5kSPRAM from litex.soc.cores.spi_flash import SpiFlash from litex.soc.cores.clock import iCE40PLL 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 # CRG ---------------------------------------------------------------------------------------------- class _CRG(Module): def __init__(self, platform, sys_clk_freq): assert sys_clk_freq == 12e6 self.rst = Signal() self.clock_domains.cd_sys = ClockDomain() self.clock_domains.cd_por = ClockDomain(reset_less=True) self.clock_domains.cd_usb_12 = ClockDomain() self.clock_domains.cd_usb_48 = ClockDomain() # # # # Clk/Rst clk48 = platform.request("clk48") platform.add_period_constraint(clk48, 1e9/48e6) # Power On Reset por_count = Signal(16, reset=2**16-1) por_done = Signal() self.comb += self.cd_por.clk.eq(ClockSignal()) self.comb += por_done.eq(por_count == 0) self.sync.por += If(~por_done, por_count.eq(por_count - 1)) # USB PLL self.submodules.pll = pll = iCE40PLL() self.comb += pll.reset.eq(self.rst) pll.clko_freq_range = ( 12e6, 275e9) # FIXME: improve iCE40PLL to avoid lowering clko_freq_min. pll.register_clkin(clk48, 48e6) pll.create_clkout(self.cd_usb_12, 12e6, with_reset=False) self.comb += self.cd_usb_48.clk.eq(clk48) self.specials += AsyncResetSynchronizer(self.cd_usb_12, ~por_done | ~pll.locked) self.specials += AsyncResetSynchronizer(self.cd_usb_48, ~por_done | ~pll.locked) # Sys Clk self.comb += self.cd_sys.clk.eq(self.cd_usb_12.clk) self.specials += AsyncResetSynchronizer(self.cd_sys, ~por_done | ~pll.locked) # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): mem_map = {**SoCCore.mem_map, **{"spiflash": 0x80000000}} def __init__(self, bios_flash_offset, **kwargs): kwargs["uart_name"] = "usb_acm" # Enforce UART to USB-ACM sys_clk_freq = int(12e6) platform = fomu_pvt.Platform() # Disable Integrated ROM/SRAM since too large for iCE40 and UP5K has specific SPRAM. kwargs["integrated_sram_size"] = 0 kwargs["integrated_rom_size"] = 0 # Set CPU variant / reset address kwargs["cpu_reset_address"] = self.mem_map["spiflash"] + bios_flash_offset # Serial ----------------------------------------------------------------------------------- # FIXME: do proper install of ValentyUSB. # FIXME: replace IoBuf with https://github.com/im-tomu/valentyusb/blob/master/valentyusb/usbcore/io.py#L13-L61. os.system("git clone https://github.com/gregdavill/valentyusb -b hw_cdc_eptri") sys.path.append("valentyusb") # SoCCore ---------------------------------------------------------------------------------- SoCCore.__init__(self, platform, sys_clk_freq, ident = "LiteX SoC on Fomu", ident_version = True, **kwargs) # CRG -------------------------------------------------------------------------------------- self.submodules.crg = _CRG(platform, sys_clk_freq) # 128KB SPRAM (used as SRAM) --------------------------------------------------------------- self.submodules.spram = Up5kSPRAM(size=128*kB) self.bus.add_slave("sram", self.spram.bus, SoCRegion(size=128*kB)) # 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_n"), sys_clk_freq = sys_clk_freq) self.add_csr("leds") # Flash -------------------------------------------------------------------------------------------- def flash(bios_flash_offset): from litex.build.dfu import DFUProg prog = DFUProg(vid="1209", pid="5bf0") bitstream = open("build/fomu_pvt/gateware/fomu_pvt.bin", "rb") bios = open("build/fomu_pvt/software/bios/bios.bin", "rb") image = open("build/fomu_pvt/image.bin", "wb") # Copy bitstream at 0x00000000 for i in range(0x00000000, 0x0020000): b = bitstream.read(1) if not b: image.write(0xff.to_bytes(1, "big")) else: image.write(b) # Copy bios at 0x00020000 for i in range(0x00000000, 0x00010000): b = bios.read(1) if not b: image.write(0xff.to_bytes(1, "big")) else: image.write(b) bitstream.close() bios.close() image.close() prog.load_bitstream("build/fomu_pvt/image.bin") # Build -------------------------------------------------------------------------------------------- def main(): parser = argparse.ArgumentParser(description="LiteX SoC on Fomu") parser.add_argument("--build", action="store_true", help="Build bitstream") parser.add_argument("--bios-flash-offset", default=0x60000, help="BIOS offset in SPI Flash") parser.add_argument("--flash", action="store_true", help="Flash Bitstream") builder_args(parser) soc_core_args(parser) args = parser.parse_args() soc = BaseSoC(args.bios_flash_offset, **soc_core_argdict(args)) builder = Builder(soc, **builder_argdict(args)) builder.build(run=args.build) if args.flash: flash(args.bios_flash_offset) if __name__ == "__main__": main()