litex-boards/litex_boards/targets/limesdr_mini_v2.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2022 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
# Build/Use:
# ./limesdr_mini_v2.py --csr-csv=csr.csv --build --load
# litex_server --jtag --jtag-config=openocd_limesdr_mini_v2.cfg
# litex_term crossover
from migen import *
from litex.gen import LiteXModule
from litex_boards.platforms import limesdr_mini_v2
from litex.soc.cores.clock import *
from litex.soc.interconnect.csr import *
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *
from litex.soc.interconnect import stream
from litex.soc.cores.led import LedChaser
from litex.soc.cores.bitbang import I2CMaster
from litex.soc.cores.usb_fifo import FT245PHYSynchronous
from litescope import LiteScopeAnalyzer
# CRG ----------------------------------------------------------------------------------------------
class _CRG(LiteXModule):
def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.cd_sys = ClockDomain()
self.cd_usb = ClockDomain()
# # #
# Clk.
clk40 = platform.request("clk40")
# PLL.
self.pll = pll = ECP5PLL()
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(clk40, 40e6)
pll.create_clkout(self.cd_sys, sys_clk_freq)
# USB.
self.comb += self.cd_usb.clk.eq(platform.request("usb_fifo_clk"))
# BoardInfo ----------------------------------------------------------------------------------------
class BoardInfo(LiteXModule, AutoCSR):
def __init__(self, revision_pads):
self.revision = CSRStorage(fields=[
CSRField("hardware", size=4, description="Hardware Revision."),
CSRField("bom", size=4, description="Bill of Material Revision."),
])
# # #
self.comb += self.revision.fields.hardware.eq(revision_pads.hardware)
self.comb += self.revision.fields.bom .eq(revision_pads.bom)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=int(80e6), toolchain="trellis",
with_usb_fifo = True, with_usb_fifo_loopback=False,
with_led_chaser = True,
**kwargs):
platform = limesdr_mini_v2.Platform(toolchain=toolchain)
# SoCCore ----------------------------------------------------------------------------------
kwargs["uart_name"] = "crossover"
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on LimeSDR-Mini-V2", **kwargs)
# JTAGBone ---------------------------------------------------------------------------------
self.add_jtagbone()
# CRG --------------------------------------------------------------------------------------
self.crg = _CRG(platform, sys_clk_freq)
# Info -------------------------------------------------------------------------------------
self.info = BoardInfo(platform.request("revision"))
# I2C Bus ----------------------------------------------------------------------------------
# - Temperature Sensor (LM72 @ 0x48).
# - Eeprom (M24128 @ 0x50) / Not populated.
self.i2c = I2CMaster(platform.request("i2c"))
# USB-FIFO ---------------------------------------------------------------------------------
if with_usb_fifo:
usb_pads = platform.request("usb_fifo")
self.usb_phy = usb_phy = FT245PHYSynchronous(
pads = usb_pads,
clk_freq = sys_clk_freq,
fifo_depth = 8,
read_time = 128,
write_time = 128,
)
if with_usb_fifo_loopback:
usb_loopback = stream.SyncFIFO([("data", 32)], 2048, buffered=True)
self.submodules += usb_loopback
self.comb += [
usb_phy.source.connect(usb_loopback.sink),
usb_loopback.source.connect(usb_phy.sink),
]
else:
self.comb += usb_phy.source.ready.eq(1) # Accept incoming stream to validate Host -> FPGA.
analyzer_probes = usb_phy.get_litescope_probes()
self.analyzer = LiteScopeAnalyzer(analyzer_probes,
depth = 512,
clock_domain = "usb",
samplerate = sys_clk_freq,
csr_csv = "analyzer.csv"
)
# Debug -------------------------------------------------------------------------------
egpio_pads = platform.request("egpio")
self.comb += egpio_pads[0].eq(ClockSignal("sys"))
self.comb += egpio_pads[1].eq(ClockSignal("usb"))
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
leds_g = Signal(4)
leds_r = Signal(4)
self.comb += platform.request_all("led_g_n").eq(~leds_g)
self.comb += platform.request_all("led_r_n").eq(~leds_r)
self.leds = LedChaser(Cat(leds_g, leds_r), sys_clk_freq)
# Build --------------------------------------------------------------------------------------------
def main():
from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=limesdr_mini_v2.Platform, description="LiteX SoC on LimeSDR-Mini-V2")
parser.add_target_argument("--sys-clk-freq", default=80e6, help="System clock frequency.")
args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq = int(float(args.sys_clk_freq)),
toolchain = args.toolchain,
**parser.soc_core_argdict
)
builder = Builder(soc, **parser.builder_argdict)
if args.build:
builder.build(**parser.toolchain_argdict)
if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(builder.get_bitstream_filename(mode="sram", ext=".svf")) # FIXME
if __name__ == "__main__":
main()