from litex.build.generic_platform import *
from litex.build.xilinx import XilinxPlatform, VivadoProgrammer
from litex.build.openocd import OpenOCD

# IOs ----------------------------------------------------------------------------------------------

_io = [
    # Clk / Rst
    ("clk12", 0, Pins("L17"), IOStandard("LVCMOS33")),

    # Leds
    ("user_led",  0, Pins("A17"), IOStandard("LVCMOS33")), # LD1
    ("user_led",  1, Pins("C16"), IOStandard("LVCMOS33")), # LD2

    # RGB
    ("user_rgb_led", 0,
        Subsignal("r", Pins("C17")),
        Subsignal("g", Pins("B16")),
        Subsignal("b", Pins("B17")),
        IOStandard("LVCMOS33"),
    ),

    # Buttons
    ("user_btn", 0, Pins("A18"), IOStandard("LVCMOS33")),  # B0
    ("user_btn", 1, Pins("B18"), IOStandard("LVCMOS33")),  # B1

    ("uart_0", 0,
        Subsignal("tx", Pins("J3")),   # 10
        Subsignal("rx", Pins("J1")),   # 11
        IOStandard("LVCMOS33"),
    ),

    # GPIO
    ("digital", 0, Pins("M3"), IOStandard("LVCMOS33")), # 1
    ("digital", 1, Pins("L3"), IOStandard("LVCMOS33")), # 2
    ("digital", 2, Pins("A16"), IOStandard("LVCMOS33")), # 3
    ("digital", 3, Pins("K3"), IOStandard("LVCMOS33")), # 4
    ("digital", 4, Pins("C15"), IOStandard("LVCMOS33")), # 5
    ("digital", 5, Pins("H1"), IOStandard("LVCMOS33")), # 6
    ("digital", 6, Pins("A15"), IOStandard("LVCMOS33")), # 7
    ("digital", 7, Pins("B15"), IOStandard("LVCMOS33")), # 8
    ("digital", 8, Pins("A14"), IOStandard("LVCMOS33")), # 9
    ("digital", 9, Pins("J3"), IOStandard("LVCMOS33")), # 10
    ("digital", 10, Pins("J1"), IOStandard("LVCMOS33")), # 11
    ("digital", 11, Pins("K2"), IOStandard("LVCMOS33")), # 12
    ("digital", 12, Pins("L1"), IOStandard("LVCMOS33")), # 13
    ("digital", 13, Pins("L2"), IOStandard("LVCMOS33")), # 14
    ("digital", 14, Pins("M1"), IOStandard("LVCMOS33")), # 17
    ("digital", 15, Pins("N3"), IOStandard("LVCMOS33")), # 18
    ("digital", 16, Pins("P3"), IOStandard("LVCMOS33")), # 19
    ("digital", 17, Pins("M2"), IOStandard("LVCMOS33")), # 20
    ("digital", 18, Pins("N1"), IOStandard("LVCMOS33")), # 21
    ("digital", 19, Pins("N2"), IOStandard("LVCMOS33")), # 22
    ("digital", 20, Pins("P1"), IOStandard("LVCMOS33")), # 23
    ("digital", 21, Pins("R3"), IOStandard("LVCMOS33")), # 26
    ("digital", 22, Pins("T3"), IOStandard("LVCMOS33")), # 27
    ("digital", 23, Pins("R2"), IOStandard("LVCMOS33")), # 28
    ("digital", 24, Pins("T1"), IOStandard("LVCMOS33")), # 29
    ("digital", 25, Pins("T2"), IOStandard("LVCMOS33")), # 30
    ("digital", 26, Pins("U1"), IOStandard("LVCMOS33")), # 31
    ("digital", 27, Pins("W2"), IOStandard("LVCMOS33")), # 32
    ("digital", 28, Pins("V2"), IOStandard("LVCMOS33")), # 33
    ("digital", 29, Pins("W3"), IOStandard("LVCMOS33")), # 34
    ("digital", 30, Pins("V3"), IOStandard("LVCMOS33")), # 35
    ("digital", 31, Pins("W5"), IOStandard("LVCMOS33")), # 36
    ("digital", 32, Pins("V4"), IOStandard("LVCMOS33")), # 37
    ("digital", 33, Pins("U4"), IOStandard("LVCMOS33")), # 38
    ("digital", 34, Pins("V5"), IOStandard("LVCMOS33")), # 39
    ("digital", 35, Pins("W4"), IOStandard("LVCMOS33")), # 40
    ("digital", 36, Pins("U5"), IOStandard("LVCMOS33")), # 41
    ("digital", 37, Pins("U2"), IOStandard("LVCMOS33")), # 42
    ("digital", 38, Pins("W6"), IOStandard("LVCMOS33")), # 43
    ("digital", 39, Pins("U3"), IOStandard("LVCMOS33")), # 44
    ("digital", 40, Pins("U7"), IOStandard("LVCMOS33")), # 45
    ("digital", 41, Pins("W7"), IOStandard("LVCMOS33")), # 46
    ("digital", 42, Pins("U8"), IOStandard("LVCMOS33")), # 47
    ("digital", 43, Pins("V8"), IOStandard("LVCMOS33")), # 48

    ("analog", 0,
      Subsignal("n"), Pins("G2"),
      Subsignal("p"), Pins("G3"),
      IOStandard("LVCMOS33")
    ),

    ("analog", 1,
      Subsignal("n"), Pins("J2"),
      Subsignal("p"), Pins("H2"),
      IOStandard("LVCMOS33")
    ),

    # PMOD
    ("pmod", 0, Pins("G17"), IOStandard("LVCMOS33")),  # 1
    ("pmod", 1, Pins("G19"), IOStandard("LVCMOS33")),  # 2
    ("pmod", 2, Pins("N18"), IOStandard("LVCMOS33")),  # 3
    ("pmod", 3, Pins("L18"), IOStandard("LVCMOS33")),  # 4
    ("pmod", 4, Pins("H17"), IOStandard("LVCMOS33")),  # 7
    ("pmod", 5, Pins("H19"), IOStandard("LVCMOS33")),  # 8
    ("pmod", 6, Pins("J19"), IOStandard("LVCMOS33")),  # 9
    ("pmod", 7, Pins("K18"), IOStandard("LVCMOS33")),  # 10

    # Serial
    ("serial", 0,
        Subsignal("tx", Pins("J18")),
        Subsignal("rx", Pins("J17")),
        IOStandard("LVCMOS33"),
    ),

    # JTAG: TMS(W9),TCK(C8),TDI(W10),TDO(W8)

    # Crypto 1-Wire (?) - goes to ATSHA204A-MAHCZ-T
    ("crypto_sda", 0, Pins("D17"), IOStandard("LVCMOS33")),

    # QSPI
    ("mx25l3233_spi", 0,
        Subsignal("cs", Pins("K19")),
        Subsignal("mosi", Pins("D18")),   # DQ0
        Subsignal("miso", Pins("D19")),   # DQ1
        #Subsignal("clk", Pins("E19")),   # ref says E19; doesn't show in xdc; C11 in schematic
        Subsignal("wp", Pins("G18")),     # DQ2
        Subsignal("hld", Pins("F18")),    # DQ3
        IOStandard("LVCMOS33")
    ),

    # SRAM
    ("issiram", 0,
        Subsignal("addr", Pins("M18 M19 K17 N17 P17 P18 R18 W19 U19 V19 W18 T17 T18 U17 U18 V16 W16 W17 V15"),
            IOStandard("LVCMOS33")
        ),
        Subsignal("data", Pins("W15 W13 W14 U15 U16 V13 V14 U14"),
            IOStandard("LVCMOS33")
        ),
        Subsignal("oen",  Pins("P19"), IOStandard("LVCMOS33")),
        Subsignal("wen",  Pins("R19"), IOStandard("LVCMOS33")),
        Subsignal("cen",  Pins("N19"), IOStandard("LVCMOS33")),
        Misc('SLEW=FAST')
    ),

]

# Platform -----------------------------------------------------------------------------------------

class Platform(XilinxPlatform):
    default_clk_name   = "clk12"
    default_clk_period = 1e9/12e6

    def __init__(self):
        XilinxPlatform.__init__(self, "xc7a35t-CPG236-1", _io, toolchain="vivado")

    #def create_programmer(self):
    #    return OpenOCD("openocd_xc7_ft2232.cfg", "bscan_spi_xc7a100t.bit")

    def do_finalize(self, fragment):
        XilinxPlatform.do_finalize(self, fragment)
        self.add_period_constraint(self.lookup_request("clk12", loose=True), self.default_clk_period)