litex-boards/litex_boards/targets/redpitaya.py

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2020-11-26 00:54:11 -05:00
#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2020 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
# SPDX-License-Identifier: BSD-2-Clause
import os
from migen import *
from litex_boards.platforms import redpitaya
from litex.build.xilinx.vivado import vivado_build_args, vivado_build_argdict
from litex.soc.interconnect import axi
from litex.soc.interconnect import wishbone
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, use_ps7_clk=False):
self.rst = Signal()
self.clock_domains.cd_sys = ClockDomain()
# # #
if use_ps7_clk:
assert sys_clk_freq == 125e6
self.comb += ClockSignal("sys").eq(ClockSignal("ps7"))
self.comb += ResetSignal("sys").eq(ResetSignal("ps7") | self.rst)
else:
self.submodules.pll = pll = S7PLL(speedgrade=-1)
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(platform.request(platform.default_clk_name), platform.default_clk_freq)
pll.create_clkout(self.cd_sys, sys_clk_freq)
platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst.
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# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, board, sys_clk_freq=int(100e6), with_led_chaser=True, **kwargs):
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platform = redpitaya.Platform(board)
# CRG --------------------------------------------------------------------------------------
use_ps7_clk = (kwargs.get("cpu_type", None) == "zynq7000")
sys_clk_freq = 125e6 if use_ps7_clk else sys_clk_freq
self.submodules.crg = _CRG(platform, sys_clk_freq, use_ps7_clk)
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# SoCCore ----------------------------------------------------------------------------------
if kwargs["uart_name"] == "serial":
kwargs["uart_name"] = "usb_uart"
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Zebboard", **kwargs)
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# Zynq7000 Integration ---------------------------------------------------------------------
if kwargs.get("cpu_type", None) == "zynq7000":
# Get and set the pre-generated .xci FIXME: change location? add it to the repository?
os.system("wget https://kmf2.trabucayre.com/redpitaya_ps7.txt")
os.makedirs("xci", exist_ok=True)
os.system("cp redpitaya_ps7.txt xci/redpitaya_ps7.xci")
self.cpu.set_ps7_xci("xci/redpitaya_ps7.xci")
# Connect AXI GP0 to the SoC with base address of 0x43c00000 (default one)
wb_gp0 = wishbone.Interface()
self.submodules += axi.AXI2Wishbone(
axi = self.cpu.add_axi_gp_master(),
wishbone = wb_gp0,
base_address = 0x43c00000)
self.bus.add_master(master=wb_gp0)
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# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.submodules.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
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# Build --------------------------------------------------------------------------------------------
def main():
from litex.soc.integration.soc import LiteXSoCArgumentParser
parser = LiteXSoCArgumentParser(description="LiteX SoC on Zedboard")
target_group = parser.add_argument_group(title="Target options")
target_group.add_argument("--build", action="store_true", help="Build design.")
target_group.add_argument("--load", action="store_true", help="Load bitstream.")
target_group.add_argument("--sys-clk-freq", default=100e6, help="System clock frequency.")
target_group.add_argument("--board", default="redpitaya14", help="Board type (redpitaya14 or redpitaya16).")
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builder_args(parser)
soc_core_args(parser)
vivado_build_args(parser)
args = parser.parse_args()
soc = BaseSoC(
board = args.board,
sys_clk_freq = int(float(args.sys_clk_freq)),
**soc_core_argdict(args)
)
builder = Builder(soc, **builder_argdict(args))
if args.build:
builder.build(**vivado_build_argdict(args))
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if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"), device=1)
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if __name__ == "__main__":
main()