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docs/Environment/Amaranth-Hdl project setup.md

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+Create a venv 
+`python -m venv .venv`
+
+Activate the venv
+`. .vent/bin/activate`
+
+Install the dependencies
+`pip install -r requirements.txt`
+
+You will potentially need more tooling to create the bitstream and flash the bitstream for the specific FPGA. In my case I'm working with an IceBreaker. So I've installed the `nextpnr-ice40` toolchain. Yosys is builtin to amaranth, that is why I'm running it within an venv to ensure it doesn't mess with system installed packages.

docs/ReBbarb.md

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+This project attempts to emulate the Gamecube BroadBand Adapter in an FPGA. The following things need to happen.
+
+ - [x] [[Amaranth-Hdl project setup]]
+	 - [x] Setup venv
+	 - [x] Install packages
+	 - [x] Flash Blinky on icebreaker
+ - [ ] Figuring out how to deal with [[external clocks]].
+	 - [x] How to get a clock greater than 12Mhz needed to interface with 32Mhz EXI
+		 - [x] PLL configured to 48Mhz
+		 - [ ] ~~48Mhz oscillator onboard? ~~
+	 - [ ] Check if Clock Domain Crossing is possible.
+	 - [ ] Oversampeling approach was tedious but worked
+ - [ ] Interfacing with [[GameCube]]
+	 - [ ] Figuring pinout of SP1.
+		 - [ ] Unofficial gamecube docs?
+ - [ ] Make sure connecting [[SP1]] to IceBreaker is safe.
+	 - [ ] Can we power the FPGA with the SP1?
+		 - [ ] How much voltage do we get from SP1.
+		 - [ ] How much current can we source?
+ - [ ] Figuring out basic [[EXI protocol]]
+	 - [ ] What is the structure of the messages?
+		 - [ ] How to know how long the message is
+		 - [ ] Integrity checks?
+	 - [ ] How fast do we need to respond to a message.

rebbarb/.gitignore

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+build

rebbarb/rebbarb.py

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+from amaranth import *
+
+class LEDBlinker(Elaboratable):
+    def elaborate(self, platform):
+        m = Module()
+
+        cd_sync = ClockDomain("sync")
+        m.domains += cd_sync
+        platform.lookup(platform.default_clk).attrs['GLOBAL'] = False
+
+        locked = Signal()
+        pllout = Signal()
+
+        m.submodules.pll = Instance("SB_PLL40_PAD",
+            p_FEEDBACK_PATH = "SIMPLE",
+            p_DIVR          = 0,
+            p_DIVF          = 7,
+            p_DIVQ          = 1,
+            p_FILTER_RANGE  = 1,
+            
+            o_LOCK          = locked,
+            i_RESETB        = 1,
+            i_BYPASS        = 0,
+            i_PACKAGEPIN    = platform.request("clk12", dir="-").io,
+            o_PLLOUTCORE    = cd_sync.clk
+        )
+
+        ledr0 = platform.request("led_r")
+        ledg0 = platform.request("led_g")
+
+        ledr1 = platform.request("led_r", 1)
+        ledg1 = platform.request("led_g", 1)
+        ledg2 = platform.request("led_g", 2)
+        ledg3 = platform.request("led_g", 3)
+        ledg4 = platform.request("led_g", 4)
+
+        half_freq = int(42e6 // 2)
+        timer = Signal(range(half_freq + 1))
+    
+        init = Signal()
+
+        with m.If(init == 0):
+            m.d.sync += ledg0.o.eq(255)
+            m.d.sync += init.eq(1)
+        
+        with m.If(timer == half_freq):
+            m.d.sync += ledr0.o.eq(~ledr0.o)
+            m.d.sync += ledg0.o.eq(~ledg0.o)
+            m.d.sync += timer.eq(0)
+        with m.Else():
+            m.d.sync += timer.eq(timer + 1)
+
+        return m
+
+from amaranth_boards.icebreaker import ICEBreakerPlatform
+from amaranth.vendor import SiliconBluePlatform;
+
+platform = ICEBreakerPlatform()
+platform.add_resources(platform.break_off_pmod)
+platform.build(LEDBlinker(), do_program=True, verbose=True, nextpnr_opts='--freq 48')

requirements.txt

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+amaranth==0.5.7
+amaranth-boards @ git+https://github.com/amaranth-lang/amaranth-boards.git@7e24efe2f6e95afddd0c1b56f1a9423c48caa472
+amaranth-yosys==0.50.0.0.post115
+importlib_resources==6.5.2
+Jinja2==3.1.6
+jschon==0.11.1
+MarkupSafe==3.0.2
+pyvcd==0.4.1
+rfc3986==2.0.0
+wasmtime==36.0.0