diff --git a/litex_boards/platforms/sipeed_tang_primer.py b/litex_boards/platforms/sipeed_tang_primer.py new file mode 100644 index 0000000..2b0f6aa --- /dev/null +++ b/litex_boards/platforms/sipeed_tang_primer.py @@ -0,0 +1,53 @@ +# +# This file is part of LiteX-Boards. +# +# Copyright (c) 2021 Miodrag Milanovic +# SPDX-License-Identifier: BSD-2-Clause + +from migen import * + +from litex.build.generic_platform import * +from litex.build.anlogic.platform import AnlogicPlatform +from litex.build.openfpgaloader import OpenFPGALoader + +# IOs ---------------------------------------------------------------------------------------------- + +_io = [ + # Clk / Rst + ("clk24", 0, Pins("K14"), IOStandard("LVCMOS33")), + + # RGB LED + ("user_led", 0, Pins("R3"), IOStandard("LVCMOS33")), # R + ("user_led", 1, Pins("J14"), IOStandard("LVCMOS33")), # G + ("user_led", 2, Pins("P13"), IOStandard("LVCMOS33")), # B + + # Buttons. + ("user_btn", 0, Pins("K16"), IOStandard("LVCMOS33")), # USER_KEY + + # Serial + ("serial", 0, + Subsignal("tx", Pins("J13")), + Subsignal("rx", Pins("H13")), + IOStandard("LVCMOS33") + ), +] + +# Connectors --------------------------------------------------------------------------------------- + +_connectors = [] + +# Platform ----------------------------------------------------------------------------------------- + +class Platform(AnlogicPlatform): + default_clk_name = "clk24" + default_clk_period = 1e9/24e6 + + def __init__(self): + AnlogicPlatform.__init__(self, "EG4S20BG256", _io, _connectors, toolchain="td") + + def create_programmer(self): + return OpenFPGALoader("licheeTang") + + def do_finalize(self, fragment): + AnlogicPlatform.do_finalize(self, fragment) + self.add_period_constraint(self.lookup_request("clk24", loose=True), 1e9/24e6) diff --git a/litex_boards/targets/sipeed_tang_primer.py b/litex_boards/targets/sipeed_tang_primer.py new file mode 100755 index 0000000..df0a981 --- /dev/null +++ b/litex_boards/targets/sipeed_tang_primer.py @@ -0,0 +1,93 @@ +#!/usr/bin/env python3 + +# +# This file is part of LiteX-Boards. +# +# Copyright (c) 2021 Miodrag Milanovic +# SPDX-License-Identifier: BSD-2-Clause + + +import argparse + +from migen import * +from migen.genlib.resetsync import AsyncResetSynchronizer + +from litex_boards.platforms import sipeed_tang_primer + +from litex.build.generic_platform import * + +from litex.soc.cores.clock import * +from litex.soc.integration.soc_core import * +from litex.soc.integration.builder import * +from litex.soc.cores.led import LedChaser + + +# CRG ---------------------------------------------------------------------------------------------- + +class _CRG(Module): + def __init__(self, platform, sys_clk_freq): + self.clock_domains.cd_sys = ClockDomain() + + # # # + + # Clk / Rst. + clk24 = platform.request("clk24") + rst_n = platform.request("user_btn", 0) + + self.comb += self.cd_sys.clk.eq(clk24) + self.specials += AsyncResetSynchronizer(self.cd_sys, ~rst_n) + +# BaseSoC ------------------------------------------------------------------------------------------ + +class BaseSoC(SoCCore): + def __init__(self, sys_clk_freq=int(24e6), with_led_chaser=True, **kwargs): + platform = sipeed_tang_primer.Platform() + + # SoCCore ---------------------------------------------------------------------------------- + SoCCore.__init__(self, platform, sys_clk_freq, + ident = "LiteX SoC on Tang Primer", + ident_version = True, + **kwargs + ) + + # CRG -------------------------------------------------------------------------------------- + self.submodules.crg = _CRG(platform, sys_clk_freq) + + # 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 Tang Primer") + parser.add_argument("--build", action="store_true", help="Build bitstream") + parser.add_argument("--load", action="store_true", help="Load bitstream") + parser.add_argument("--flash", action="store_true", help="Flash Bitstream") + parser.add_argument("--sys-clk-freq",default=24e6, help="System clock frequency (default: 24MHz)") + 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(os.path.join(builder.gateware_dir, soc.build_name + ".bit")) + + if args.flash: + prog = soc.platform.create_programmer() + prog.flash(0, os.path.join(builder.gateware_dir, soc.build_name + ".bit")) + + + +if __name__ == "__main__": + main()