Funtional verilog ping_pong simulator

Author: scopeInfinity

README.md

@@ -8,12 +8,13 @@ The eventual goal(?) is to build a general-purpose processor integrated with sim
 ## Sample Programs
 
 * Ping Pong
+  * 16x8 LED display with W/S/Up/Down keyboard controller
   * Source: [ping_pong.asm](programs/ping_pong.asm)
   * Generate resolved assembly: `python3 -m planner asm -r programs/ping_pong.asm` [[example](output/programs/ping_pong_resolved.asm)]
   * Generate binary: `python3 -m planner asm -b programs/ping_pong.asm` [[example](output/programs/ping_pong.bin)]
-  * Run on emulator: `python3 -m planner compile_and_execute ping_pong`
-    * 16x8 LED display with W/S/Up/Down keyboard controller
+  * Run on python emulator: `python3 -m planner compile_and_execute ping_pong`
     * ![image](https://github.com/user-attachments/assets/9fa2f68f-73ae-465c-a29c-cc92b0dc421a)
+  * Run on verilog emulator: `make verilog_simulate`
 
 ## Design
 

emulator/Makefile.mk

@@ -3,9 +3,9 @@ SRC_EMULATOR = $(SRC_DIR)/emulator
 
 .PHONY: verilog_modules test_verilog_modules verilog_data_prerequisites verilog_simulate
 
-$(BUILD_EMULATOR)/%_test: $(SRC_EMULATOR)/%_test.v
+$(BUILD_EMULATOR)/%_test: $(SRC_EMULATOR)/%_test.v $(SRC_EMULATOR)/%.v
 	mkdir -p $(dir $@)
-	iverilog -o $@ $^
+	iverilog -o $@ $<
 
 verilog_modules: $(BUILD_EMULATOR)/executable_chipset $(patsubst $(SRC_EMULATOR)/%_test.v, $(BUILD_EMULATOR)/%_test, $(shell find $(SRC_EMULATOR) -name '*_test.v'))
 	mkdir -p $(BUILD_EMULATOR)/io

emulator/module/ipc.cpp

@@ -31,7 +31,7 @@ module IODevices(
     ROM_PINGPONG prom(.out(prom_value), .address(value_in[15:0]));
 
     reg[31:0] _value;
-    always @(device_id) begin
+    always @(clk) begin
         case (device_id)
             // TODO: Is it ok to use continous circuit with value_in as address?
             `PROM_ID: _value <= prom_value;

emulator/seq/io_devices.v

@@ -27,6 +27,10 @@ module IODevices_test;
         clk = 0;
         # 10
         device_id = 3;  // const
+        # 1
+        clk = 1;
+        # 1
+        clk = 0;
         # 5
         $display("IO_DEVICES_TEST: device_id=%b value_out=%b", device_id, value_out);
         if (value_out !== INPUT1) begin
@@ -36,6 +40,10 @@ module IODevices_test;
         # 10
         device_id = 2;  // PROM
         value_in = 0;
+        # 1
+        clk = 1;
+        # 1
+        clk = 0;
         # 10
         $display("IO_DEVICES_TEST: device_id=%b value_out=%b", device_id, value_out);
         if (value_out === INPUT1) begin

emulator/seq/io_devices_test.v

@@ -1,25 +1,18 @@
 from planner.sim import devices
 import threading
-import os
-from ctypes import cdll, c_int, CFUNCTYPE
 
-IO_DEVICES = 16
-LIB = "build/emulator/module/libipc.so"
-INPUT_FILE = "/tmp/ourpc_input.txt"
+IO_DEVICES = 8
+INPUT_FILE = "/tmp/ourpc_input"
 
 global_io = None
-@CFUNCTYPE(None, c_int, c_int)
-def handle_output(pid, value):
-    print("Got PID(%d) Value(%d)" % (pid, value))
-    global_io.output_devices[pid].update(value)
 
-def io_loop(hh):
+def io_loop():
     while True:
         s = input()
         print(s)
         s=s.split()
         if s[0]=="IPC":
-            pid,value = s[1],s[2]
+            pid,value = s[1], s[2]
             pid=int(pid, 16)
             value=int(value, 16)
             print("Got PID(%d) Value(%d)" % (pid, value))
@@ -34,12 +27,10 @@ def __init__(self):
         self.input_devices = [None]*IO_DEVICES
         self.output_devices = [None]*IO_DEVICES
 
-        # lib = cdll.LoadLibrary(LIB)
-        # lib.fast_io_loop
         global global_io
         global_io = self
         self.mu = threading.Lock()
-        self.t = threading.Thread(target=io_loop, args=[handle_output])
+        self.t = threading.Thread(target=io_loop, args=[])
 
 
     def run(self, blocking=True):
@@ -57,13 +48,10 @@ def write_input(self, new_val, old_val):
             with open(INPUT_FILE, "w") as f:
                 f.write(data_str)
 
+
     def set_input_device(self, index: int, d: devices.InputDevice):
         d.add_change_handler(self.write_input)
         self.input_devices[index] = d
 
     def set_output_device(self, index: int, d: devices.Device):
         self.output_devices[index] = d
-
-
-
-