add Zybo Z7 minimal platform/targets: no PS7 support and USB-UART PMOD on JB.

litex_boards/platforms/zybo_z7.py

+# This file is Copyright (c) 2019-2020 Florent Kermarrec <florent@enjoy-digital.fr>
+# License: BSD
+
+from litex.build.generic_platform import *
+from litex.build.xilinx import XilinxPlatform, VivadoProgrammer
+
+# IOs ----------------------------------------------------------------------------------------------
+
+_io = [
+    # clk125
+    ("clk125", 0, Pins("L16"), IOStandard("LVCMOS33")),
+
+    # user led
+    ("user_led", 0, Pins("M14"), IOStandard("LVCMOS33")),
+    ("user_led", 1, Pins("M15"), IOStandard("LVCMOS33")),
+    ("user_led", 2, Pins("G14"), IOStandard("LVCMOS33")),
+    ("user_led", 3, Pins("D18"), IOStandard("LVCMOS33")),
+
+    # user sw
+    ("user_sw", 0, Pins("G15"), IOStandard("LVCMOS33")),
+    ("user_sw", 1, Pins("P15"), IOStandard("LVCMOS33")),
+    ("user_sw", 2, Pins("W13"), IOStandard("LVCMOS33")),
+    ("user_sw", 3, Pins("T16"), IOStandard("LVCMOS33")),
+
+    # user btn
+    ("user_btn", 0, Pins("R18"), IOStandard("LVCMOS33")),
+    ("user_btn", 1, Pins("P16"), IOStandard("LVCMOS33")),
+    ("user_btn", 2, Pins("V16"), IOStandard("LVCMOS33")),
+    ("user_btn", 3, Pins("Y16"), IOStandard("LVCMOS33")),
+
+    # serial
+    ("serial", 0,
+        Subsignal("tx", Pins("T17")),
+        Subsignal("rx", Pins("Y17")),
+        IOStandard("LVCMOS33")
+    ),
+]
+
+_usb_uart_pmod_io = [
+    # USB-UART PMOD on JB:
+    # - https://store.digilentinc.com/pmod-usbuart-usb-to-uart-interface/
+    ("usb_uart", 0,
+        Subsignal("tx", Pins("pmodb:1")),
+        Subsignal("rx", Pins("pmodb:2")),
+        IOStandard("LVCMOS33")
+    ),
+]
+
+# Connectors ---------------------------------------------------------------------------------------
+
+_connectors = [
+    ("pmoda", "N15 L14 K16 K14 N16 L15 J16 J14"), # XADC
+    ("pmodb", "T20 U20 V20 W20 Y18 Y19 W18 W19"),
+    ("pmodc", "V15 W15 T11 T10 W14 Y14 T12 U12"),
+    ("pmodd", "T14 T15 P14 R14 U14 U15 V17 V18"),
+    ("pmode", "V12 W16 J15 H15 V13 U17 T17 Y17"),
+]
+
+# Platform -----------------------------------------------------------------------------------------
+
+class Platform(XilinxPlatform):
+    default_clk_name   = "clk128"
+    default_clk_period = 1e9/125e6
+
+    def __init__(self):
+        XilinxPlatform.__init__(self, "xc7z010-clg400-1", _io,  _connectors, toolchain="vivado")
+        self.add_extension(_usb_uart_pmod_io)
+
+    def create_programmer(self):
+        return VivadoProgrammer()
+
+    def do_finalize(self, fragment):
+        XilinxPlatform.do_finalize(self, fragment)
+        self.add_period_constraint(self.lookup_request("clk125", loose=True), 1e9/125e6)

litex_boards/targets/zybo_z7.py

+#!/usr/bin/env python3
+
+# This file is Copyright (c) 2019-2020 Florent Kermarrec <florent@enjoy-digital.fr>,
+# License: BSD
+
+import os
+import argparse
+
+from migen import *
+
+from litex_boards.platforms import zybo_z7
+from litex.build.xilinx.vivado import vivado_build_args, vivado_build_argdict
+
+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()
+
+        # # #
+
+        self.submodules.pll = pll = S7PLL(speedgrade=-1)
+        pll.register_clkin(platform.request("clk125"), 125e6)
+        pll.create_clkout(self.cd_sys,       sys_clk_freq)
+
+# BaseSoC ------------------------------------------------------------------------------------------
+
+class BaseSoC(SoCCore):
+    def __init__(self, sys_clk_freq=int(100e6), **kwargs):
+        platform = zybo_z7.Platform()
+
+        # SoCCore ----------------------------------------------------------------------------------
+        if kwargs["uart_name"] == "serial": kwargs["uart_name"] = "usb_uart" # Use USB-UART Pmod on JB.
+        SoCCore.__init__(self, platform, sys_clk_freq,
+            ident          = "LiteX SoC on Zybo Z7",
+            ident_version  = True,
+            **kwargs)
+
+        # CRG --------------------------------------------------------------------------------------
+        self.submodules.crg = _CRG(platform, sys_clk_freq)
+
+        # Leds -------------------------------------------------------------------------------------
+        self.submodules.leds = LedChaser(
+            pads         = Cat(*[platform.request("user_led", i) for i in range(4)]),
+            sys_clk_freq = sys_clk_freq)
+        self.add_csr("leds")
+
+# Build --------------------------------------------------------------------------------------------
+
+def main():
+    parser = argparse.ArgumentParser(description="LiteX SoC on Zybo Z7")
+    parser.add_argument("--build", action="store_true", help="Build bitstream")
+    parser.add_argument("--load",  action="store_true", help="Load bitstream")
+    builder_args(parser)
+    soc_core_args(parser)
+    vivado_build_args(parser)
+    args = parser.parse_args()
+
+    soc = BaseSoC(**soc_core_argdict(args))
+    builder = Builder(soc, **builder_argdict(args))
+    builder.build(**vivado_build_argdict(args), run=args.build)
+
+    if args.load:
+        prog = soc.platform.create_programmer()
+        prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bit"), device=1)
+
+if __name__ == "__main__":
+    main()