add cxxrtl platform

example-config.toml

@@ -0,0 +1,52 @@
+# Groovylight configuration base file.
+# make your edits using this, at the moment the defaults are not stored
+# in the program so every value must be specified.
+
+
+[hardware]
+# The target platform.
+# Valid options: "cxxrtl", "colorlight"
+type = "cxxrtl" 
+
+# hardware-specific options, these are gently parsed i.e extra options are ignored.
+# colorlight options
+
+# Maps the strings array onto the colorlight connectors.
+# it's fine (but will raise a warning) if the list is longer than the number of strings.
+stringmapping = [ "J1", "J2", "J3", "J4", "J5", "J6", "J7", "J8" ]
+
+# cxxrtl options
+
+
+[network]
+# Network port to listen on for UDP datagrams.
+port = 9999
+
+# IPv4 address to use for the Ethernet port.
+# This setting is ignored for CXXRTL.
+# 'dhcp' will get the IP at runtime.
+ip = "dhcp" # Can also be e.g. "192.168.0.123"
+
+[display]
+strict = true # allows some wacky configurations, like panels that overlap.
+
+[[display.strings]]
+position = { x = 31, y = 0 }
+dimensions = { width = 256, height = 64 }
+rotation = "UPDOWN"
+[[display.strings]]
+position = { x = 32, y = 0 }
+dimensions = { width = 256, height = 64 }
+rotation = "LEFTRIGHT"
+[[display.strings]]
+position = { x = 32, y = 64 }
+dimensions = { width = 256, height = 64 }
+rotation = "LEFTRIGHT"
+[[display.strings]]
+position = { x = 32, y = 128 }
+dimensions = { width = 256, height = 64 }
+rotation = "LEFTRIGHT"
+[[display.strings]]
+position = { x = 32, y = 192 }
+dimensions = { width = 256, height = 64 }
+rotation = "LEFTRIGHT"

src/groovylight/common.py

@@ -1,4 +1,4 @@
-from amaranth import unsigned
+from amaranth import Array, unsigned
 from amaranth.lib import wiring, data
 from amaranth.lib.wiring import Out
 
@@ -42,13 +42,14 @@ class Hub75Ctrl(wiring.Signature):
 
     """
 
-    def __init__(self):
+    def __init__(self, n_strings: int = 1):
         super().__init__(
             {
                 "latch": Out(1),
                 "oe": Out(1),
                 "addr": Out(5),
                 "display_clk": Out(1),
+                "data": Out(Hub75Data()).array(n_strings),
             }
         )
 

src/groovylight/config.py

@@ -0,0 +1,25 @@
+import tomllib
+from pathlib import Path
+
+from groovylight.geom import (
+    Coord,
+    DisplayDimensions,
+    DisplayGeometry,
+    DisplayRotation,
+    DisplayString,
+)
+
+
+class Config:
+    def __init__(self, file: Path) -> None:
+        with file.open("rb") as f:
+            self.conf = tomllib.load(f)
+
+        self.geom = DisplayGeometry(self.conf.display.strict)
+        for string in self.conf.display.strings:
+            pos = Coord(**string.position)
+            dims = DisplayDimensions(**string.dimensions)
+            rot = DisplayRotation[string.rotation]
+            disp = DisplayString(pos, dims, rot)
+            self.geom.add_string(disp)
+        self.network = self.conf.network  # FIXME: parse this properly.

src/groovylight/gamma.py

@@ -24,8 +24,30 @@
 # This file contains code to generate these timing adjustments and
 # control/quantify them.
 
+
+# FIXME: This doesn't work. As much as I wish it did. Because the numbers are still
+# added linearly. values that are between the powers of two (which are fitted to the log
+# curve) are not even remotely close to matching.
+# thankfully a gamma LUT is only 64 elements. we will need 3 muxes per color (1 per channel).
+
 from math import pow
 
+from amaranth import Module, Cat, Mux, ShapeLike, Signal, Assert
+from amaranth.build import Platform
+from amaranth.lib import wiring, data
+from amaranth.lib.wiring import In, Out
+from amaranth.lib.memory import Memory, ReadPort, WritePort
+from amaranth.utils import ceil_log2
+
+
+class GammaLUT(wiring.Component):
+    def __init__(self, n_bits: int, gamma: float = 2.2):
+        self.gamma = gamma
+        self.n_bits = n_bits
+        self.lut = [pow(x, gamma) for x in range(2**n_bits)]
+
+        # TODO: we can combo it maybe with the variable timing method.
+        super().__init__(wiring.Signature({}))
 
 def _gammavec(vals: [float], g: float) -> [float]:
     return [pow(x, g) for x in vals]

src/groovylight/geom.py

@@ -173,7 +173,8 @@ class DisplayGeometry:
         will overlap with an existing string.
         """
 
+        if self.strict:
             for e in self._strings:
                 if e.intersects(s):
-                pass
-
+                    raise RuntimeError(f"node {e} intersects with {s}")
+        self._strings.append(s)

src/groovylight/hub75.py

@@ -8,7 +8,6 @@ from amaranth.utils import ceil_log2
 from .common import Rgb666Layout, Hub75Stream, Hub75Ctrl, Hub75Data
 
 
-
 class SwapBuffer(wiring.Component):
     """A pair of BRAMs for holdling line data that are swapped between using an external signal.
 
@@ -164,8 +163,7 @@ class Hub75Coordinator(wiring.Component):
         self.n_strings = n_strings
         super().__init__(
             {
-                "ctrl": Out(Hub75Ctrl),
-                "data": data.ArrayLayout(Hub75Data, n_strings),
+                "hub75": Out(Hub75Ctrl(n_strings)),
                 # TODO: fetching routine? maybe it's passed through.
             }
         )

src/groovylight/main.py

@@ -1,10 +1,8 @@
 # main entry point for CLI applications.
 
-
 import logging
 import argparse
 
-
 logger = logging.getLogger(__loader__.name)
 
 
@@ -12,9 +10,7 @@ def setup_logger(args):
     root_logger = logging.getLogger()
     handler = logging.StreamHandler()
 
-    formatter = logging.Formatter(
-        style="{", fmt="{levelname:s}: {name:s}: {message:s}"
-    )
+    formatter = logging.Formatter(style="{", fmt="{levelname:s}: {name:s}: {message:s}")
     handler.setFormatter(formatter)
 
     root_logger.addHandler(handler)
@@ -33,6 +29,7 @@ def main():
         const=logging.DEBUG,
         default=logging.INFO,
     )
+
     parser.add_argument(
         "-L",
         "--log-file",

src/groovylight/platforms/colorlight_5a75b_v8_2.py

@@ -23,7 +23,9 @@ class Colorlight_5A75B_R82Platform(LatticeECP5Platform):
             Subsignal("copi", Pins("T8", dir="o")),
             Attrs(IO_TYPE="LVCMOS33"),
         ),
-        *LEDResources(pins="T6", invert=True, attrs=Attrs(IO_TYPE="LVCMOS33", DRIVE="4")),
+        *LEDResources(
+            pins="T6", invert=True, attrs=Attrs(IO_TYPE="LVCMOS33", DRIVE="4")
+        ),
         *ButtonResources(
             pins="R7", invert=True, attrs=Attrs(IO_TYPE="LVCMOS33", PULLMODE="UP")
         ),

src/groovylight/platforms/cxxrtl_sim.py

@@ -0,0 +1,9 @@
+# CXXRTL-based simulator.
+# Uses SDL2 + black-box network stack to simulate the entire design.
+
+
+# Tasks:
+# Generate header with network port information
+# black box the UDP streaming.
+# provide code for display outputs to render onto SDL2 canvas.
+# compile code (optionally)

src/groovylight/sdram.py

@@ -13,10 +13,13 @@ from amaranth.lib.wiring import In, Out
 # word size = 32
 # 8 megabytes data.
 
+
 class SDRAMSignature(wiring.Signature):
     """Signature of a variable-size sdram. Data is split between in/out and has out_en"""
+
     def __init__(self, addr_width, data_width=32, bank_width=2):
-        super().__init__({
+        super().__init__(
+            {
                 "nCS": Out(1),
                 "cke": Out(1),
                 "nRAS": Out(1),
@@ -28,31 +31,41 @@ class SDRAMSignature(wiring.Signature):
                 # todo: use dqm
                 "data_wren": Out(1),
                 "bank_cs": Out(bank_width),
-            })
+            }
+        )
+
 
 class _WriteBurstLength(enum.Enum, shape=1):
     """MRS Write burst mode"""
+
     BURST = 0
     SINGLE_BIT = 1
 
+
 class _TestMode(enum.Enum, shape=2):
     """The "test mode" of the sdram. This is always zero pretty much"""
+
     MODE_REGISTER_SET = 0
     RESERVED0 = 1
     RESERVED1 = 2
     RESERVED2 = 3
 
+
 class _CASLatency(enum.Enum, shape=3):
     """How many cycles of latency for the column address select to complete"""
+
     CYCL2 = 2
     CYCL3 = 3
 
+
 class _BurstType(enum.Enum, shape=1):
     SEQUENTIAL = 0
     INTERLEAVED = 1
 
+
 class _BurstLength(enum.IntEnum, shape=3):
     """The size of the burst"""
+
     SINGLE = 0
     DUAL = 1
     QUAD = 2
@@ -62,6 +75,7 @@ class _BurstLength(enum.IntEnum, shape=3):
 
 class _Command(enum.Enum):
     """Command set for SDRAM"""
+
     MRS_WRITE = 0
     ACTIVATE = 1
     PRECHARGE = 2
@@ -73,7 +87,6 @@ class _Command(enum.Enum):
     NOP = 8
 
 
-
 class BankController(wiring.Component):
     """Manages a single Bank. Has a bank locking/state tracker,
     can issue commands"""

src/groovylight/tests/test_geom.py

@@ -2,6 +2,7 @@ from ..geom import Coord, BBox
 
 import pytest
 
+
 def test_coord_comparison():
     c1 = Coord(0, 0)
     c2 = Coord(0, 1)
@@ -15,6 +16,7 @@ def test_coord_comparison():
     assert c3 == c3_other, "Coords with same numbers should equal each other"
     assert c3 != c2
 
+
 def test_coord_construction():
     with pytest.raises(RuntimeError):
         Coord(0, -1)

src/groovylight/tests/test_hub75.py

@@ -5,7 +5,7 @@ from amaranth.lib.wiring import In, Out
 from amaranth.lib.memory import Memory, WritePort
 from amaranth.sim import Simulator
 
-from ..bitslicer import Hub75StringDriver, Rgb666Layout
+from ..hub75 import Hub75Coordinator, Hub75StringDriver, Rgb666Layout
 
 
 def test_stringdriver():
@@ -36,3 +36,8 @@ def test_stringdriver():
 
     with sim.write_vcd("output.vcd"):
         sim.run_until(1e-6 * 1000)
+
+
+def test_hub75():
+    m = Module()
+    m.submodules.dut = dut = Hub75Coordinator(1)

src/groovylight/tests/test_swapbuffer.py

@@ -1,11 +1,6 @@
-from amaranth import Array, Module, Cat, Signal, Assert, unsigned
-from amaranth.build import Platform
-from amaranth.lib import wiring, data
-from amaranth.lib.wiring import In, Out
-from amaranth.lib.memory import Memory, WritePort
 from amaranth.sim import Simulator
 
-from ..bitslicer import Hub75StringDriver, Rgb666Layout, SwapBuffer
+from ..hub75 import Hub75StringDriver, Rgb666Layout, SwapBuffer
 
 
 def test_swapbuffer():
@@ -25,7 +20,9 @@ def test_swapbuffer():
         assert ctx.get(dut.read_port.data) == init_color
         # swap buffer
         ctx.set(dut.selector, 1)
-        await ctx.tick().repeat(2) # takes two clocks after switching selector to output data.
+        await ctx.tick().repeat(
+            2
+        )  # takes two clocks after switching selector to output data.
         assert ctx.get(dut.read_port.data) == test_color
 
     # TODO: add more assertions/verification

tests/test_platform.py

@@ -1,8 +1,16 @@
+import shutil
+import pytest
 from amaranth import Elaboratable, Module, Signal
 from amaranth.lib.io import Buffer
 from groovylight.platforms.colorlight_5a75b_v8_2 import Colorlight_5A75B_R82Platform
 
 
+def progs_exist(programs) -> bool:
+    for p in programs:
+        if shutil.which(p) is None:
+            return False
+    return True
+
 class Blinky(Elaboratable):
     def elaborate(self, platform):
         m = Module()
@@ -22,5 +30,8 @@ class Blinky(Elaboratable):
 
 
 def test_platform():
+    if not progs_exist(["yosys", "nextpnr-ecp5", "openFPGALoader"]):
+        pytest.skip("missing toolchain programs")
     plat = Colorlight_5A75B_R82Platform()
+
     plat.build(Blinky())