wip: wishbone tool and non-workign hub75

flake.nix

@@ -49,6 +49,7 @@
             nextpnr
             pkgsCross.riscv64.buildPackages.gcc
             gnumake
+            wishbone-tool
             # simulators
             verilog
             verilator

groovylight/hub75.py

@@ -2,25 +2,92 @@
 
 # r0 g0 b0 gnd r1 g1 b1 e a b c d clk stb oe gnd
 from litex.build.generic_platform import Signal, Subsignal, Pins
-from litex.build.io import Module
+from litex.build.io import FSM, Module
+from litex.gen import If, NextState, NextValue
 
 def make_hub75_iodevice(index, basename):
     b = basename
     signals = ("hub75_iodev", index,
-               Subsignal("r0", Pins(f"{b}:1")),
-               Subsignal("g0", Pins(f"{b}:2")),
-               Subsignal("b0", Pins(f"{b}:3")),
-               Subsignal("r1", Pins(f"{b}:5")),
-               Subsignal("g1", Pins(f"{b}:6")),
-               Subsignal("b1", Pins(f"{b}:7")),
-               Subsignal("addr", Pins(f"{b}:9 {b}:10 {b}:11 {b}:12 {b}:8")),
-               Subsignal("clk", Pins(f"{b}:13")),
-               Subsignal("stb", Pins(f"{b}:14")),
-               Subsignal("oe", Pins(f"{b}:15")),
+               Subsignal("r0", Pins(f"{b}:0")),
+               Subsignal("g0", Pins(f"{b}:1")),
+               Subsignal("b0", Pins(f"{b}:2")),
+               Subsignal("r1", Pins(f"{b}:4")),
+               Subsignal("g1", Pins(f"{b}:5")),
+               Subsignal("b1", Pins(f"{b}:6")),
+               Subsignal("addr", Pins(f"{b}:8 {b}:9 {b}:10 {b}:11 {b}:7")),
+               Subsignal("clk", Pins(f"{b}:12")),
+               Subsignal("stb", Pins(f"{b}:13")),
+               Subsignal("oe", Pins(f"{b}:14")),
             )
     return [signals]
 
 
 class Hub75Driver(Module):
-    count = Signal(8) # fsm counter
+    def __init__(self, base_freq=60e6, linedepth=128):
+        if base_freq // 2 > 30e6:
+            raise RuntimeError("hi")
+
+        self.phase = Signal() # divider/counter
+        self.addr = Signal(5)
+        self.latch = Signal()
+        self.output_en = Signal()
+        self.rgb = Signal(6)
+
+
+        # clk-en acts as a gate.
+        clock_en = Signal()
+        
+        self.clock_out = Signal()
+        # self.comb += self.clock_out.eq(self.phase & clock_en)
+        # clock counter increments.
+        self.sync += self.phase.eq(self.phase + 1)
+
+        # self.sync += If(self.phase == 1, If(clock_en, self.clock_out.eq(self.phase)).Else(self.clock_out.eq(0)))
+        self.sync += If(clock_en, self.clock_out.eq(self.phase)).Else(self.clock_out.eq(0))
+
+        self.fsm = fsm = FSM()
+        self.submodules += self.fsm
+
+        self.comb += self.rgb.eq(0b111010)
+
+        counter = Signal(8)
+
+        fsm.act("ready",
+                NextValue(self.output_en, 1),
+                NextValue(self.pixnum, linedepth - 1),
+                NextValue(self.latch, 0),
+                If(self.phase == 1,
+                   NextValue(self.addr, self.addr + 1),
+                   NextValue(clock_en, 1),
+                   NextState("transmit"),
+                ),
+                # If((self.state_count == 7), NextValue(clock_en, ~clock_en)),
+        )
+        fsm.act("transmit",
+            If(self.phase == 1,
+                NextValue(self.pixnum, self.pixnum - 1),
+                If(self.pixnum == 0,
+                   NextState("latch_delay"),
+                )
+            )
+        )
+        fsm.act("latch_delay",
+            NextValue(clock_en, 0),
+                If(self.phase == 1,
+                   NextState("latchout")
+                   )
+                )
+        fsm.act("latchout",
+            If(self.phase == 1,
+               NextValue(self.latch, 1),
+               NextValue(counter, 0),
+               NextState("done")
+            )
+        )
+        fsm.act("done",
+            NextValue(self.output_en, 0),
+            NextValue(self.latch, 0),
+            NextValue(counter, counter + 1),
+            If(counter == 255, NextState("ready"))
+        )
 

groovylight/platform/colorlight_5a_75b_8_0.py

@@ -93,6 +93,7 @@ _connectors = [
 class _CRG(LiteXModule):
     def __init__(self, platform, sys_clk_freq, with_reset = False):
         self.cd_sys = ClockDomain("sys")
+        self.cd_hub = ClockDomain("hub")
         # self.cd_sdram = ClockDomain("sdram")
         self.cd_sys2x = ClockDomain()
         self.cd_sys2x_ps = ClockDomain()
@@ -105,13 +106,14 @@ class _CRG(LiteXModule):
         self.pll = pll = ECP5PLL()
 
         rst_n = platform.request("user_btn_n", 0) if with_reset else 1
-        self.comb += [pll.reset.eq(~rst_n)]
+        self.comb += pll.reset.eq(~rst_n)
         pll.register_clkin(clk25, 25e6)
         pll.create_clkout(self.cd_sys, sys_clk_freq)
         # for the sdram
         # pll.create_clkout(self.cd_sdram, sys_clk_freq, phase=180)
         pll.create_clkout(self.cd_sys2x,    2*sys_clk_freq)
         pll.create_clkout(self.cd_sys2x_ps, 2*sys_clk_freq, phase=180) 
+        pll.create_clkout(self.cd_hub, 30e6)
 
 
         sdram_clk = ClockSignal("sys2x_ps")

groovylight/soc.py

@@ -13,7 +13,7 @@ from litedram.phy import GENSDRPHY, HalfRateGENSDRPHY
 from liteeth.phy.ecp5rgmii import LiteEthPHYRGMII
 
 from platform.colorlight_5a_75b_8_0 import Groovy1Platform
-
+from hub75 import Hub75Driver, make_hub75_iodevice
 
 class GroovySoC(SoCCore):
     def __init__(self, platform, sys_clk_freq,
@@ -49,6 +49,24 @@ class GroovySoC(SoCCore):
             self.mem_map["spiflash"] = 0x20000000
             mod = SpiFlashModule(SpiNorFlashOpCodes.READ_1_1_1)
             self.add_spi_flash(mode="1x", module=SpiFlashModule, with_master=False)
+        self.platform.add_extension(make_hub75_iodevice(0, "j4"))
+        hub_io = self.platform.request("hub75_iodev", 0)
+        self.submodules.hub75 = hub75 = ClockDomainsRenamer("hub")(Hub75Driver())
+        self.comb += [
+                hub_io.r0.eq(hub75.rgb[0]),
+                hub_io.r1.eq(hub75.rgb[3]),
+                hub_io.g0.eq(hub75.rgb[1]),
+                hub_io.g1.eq(hub75.rgb[4]),
+                hub_io.b0.eq(hub75.rgb[2]),
+                hub_io.b1.eq(hub75.rgb[5]),
+                hub_io.clk.eq(hub75.clock_out),
+                hub_io.addr.eq(hub75.addr),
+                hub_io.oe.eq(hub75.output_en),
+                hub_io.stb.eq(hub75.latch),
+
+        ]
+
+
 
 
 

litex/default.nix

@@ -2,6 +2,7 @@
 let 
   tag = "2023.12";
 in final: prev: {
+  wishbone-tool = prev.callPackage(import ./wishbone-tool.nix) { };
   pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
     (python-final: python-prev: {
       litex = python-final.callPackage(import ./litex.nix tag) { };

litex/wishbone-tool.nix

@@ -0,0 +1,17 @@
+{ lib, fetchFromGitHub, rustPlatform }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "wishbone-tool";
+  version = "0.7.9-git";
+
+  src = fetchFromGitHub {
+    owner = "litex-hub";
+    repo = "wishbone-utils";
+    rev = "master";
+    hash = "sha256-ZEJ3hd5G/zziCMqG1yvRzrt3JX6PtJupenq+xM8AKO0=";
+  };
+  sourceRoot = "${src.name}/wishbone-tool";
+
+
+  cargoHash = "sha256-kWvtZEXtb5bZ7/hd8jsr41UGSDOuDU4tyKWAL0kDoIg=";
+}