61 lines
2.0 KiB
Python
61 lines
2.0 KiB
Python
#
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# This file is part of LiteX-Boards.
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#
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# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
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# SPDX-License-Identifier: BSD-2-Clause
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# Board diagram/pinout:
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# https://user-images.githubusercontent.com/1450143/133655492-532d5e9a-0635-4889-85c9-68683d06cae0.png
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# http://dl.sipeed.com/TANG/Nano/HDK/Tang-NANO-2704(Schematic).pdf
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from migen import *
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from litex.build.generic_platform import *
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from litex.build.gowin.platform import GowinPlatform
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from litex.build.openfpgaloader import OpenFPGALoader
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# IOs ----------------------------------------------------------------------------------------------
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_io = [
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# Clk / Rst
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("clk24", 0, Pins("35"), IOStandard("LVCMOS33")),
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# Leds
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("user_led", 0, Pins("16"), IOStandard("LVCMOS33")),
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("user_led", 1, Pins("17"), IOStandard("LVCMOS33")),
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("user_led", 2, Pins("18"), IOStandard("LVCMOS33")),
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# Buttons.
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("user_btn", 0, Pins("15"), IOStandard("LVCMOS33")),
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("user_btn", 1, Pins("14"), IOStandard("LVCMOS33")),
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# Serial
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("serial", 0,
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Subsignal("tx", Pins("8")),
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Subsignal("rx", Pins("9")),
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IOStandard("LVCMOS33")
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),
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]
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# Connectors ---------------------------------------------------------------------------------------
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_connectors = []
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# Platform -----------------------------------------------------------------------------------------
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class Platform(GowinPlatform):
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default_clk_name = "clk24"
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default_clk_period = 1e9/24e6
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def __init__(self, toolchain="gowin"):
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GowinPlatform.__init__(self, "GW1N-LV1QN48C6/I5", _io, _connectors, toolchain=toolchain, devicename="GW1N-1")
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self.toolchain.options["use_done_as_gpio"] = 1
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self.toolchain.options["use_reconfign_as_gpio"] = 1
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def create_programmer(self):
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return OpenFPGALoader("tangnano")
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def do_finalize(self, fragment):
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GowinPlatform.do_finalize(self, fragment)
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self.add_period_constraint(self.lookup_request("clk24", loose=True), 1e9/24e6)
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