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