[cocotb] Add option to dump waves and increase timescale

- Adds a `--waves` option to tell cocotb to dump a waveform.
- Increases the timescale

Author: teqdruid

tools/circt-cocotb-driver/circt-cocotb-driver.py.in

@@ -31,6 +31,10 @@ def parseArgs(args):
                          required=True,
                          help="Name of the python module.")
 
+  argparser.add_argument("--waves",
+                         action="store_true",
+                         help="Enable waveform dumping.")
+
   argparser.add_argument(
       "--pythonFolders",
       type=str,
@@ -82,7 +86,7 @@ class Icarus(csim.Icarus):
     # lives easier and create a minimum timescale through the command-line.
     cmd_file = os.path.join(objDir, "cmds.f")
     with open(cmd_file, "w+") as f:
-      f.write("+timescale+1ns/1ps\n")
+      f.write("+timescale+1ns/100ps\n")
 
     self.compile_args.extend([
         f"-f{cmd_file}",
@@ -117,7 +121,7 @@ class Questa(csim.Questa):
     # lives easier and create a minimum timescale through the command-line.
     cmd_file = os.path.join(objDir, "cmds.f")
     with open(cmd_file, "w+") as f:
-      f.write("+timescale+1ns/1ps")
+      f.write("+timescale+1ns/100ps")
 
     self.gui = gui
     self.extra_compile_args = ["-f", f"{cmd_file}"]
@@ -151,6 +155,7 @@ def main():
       "verilog_sources": sources,
       "python_search": [f.strip() for f in args.pythonFolders.split(",")],
       "work_dir": objDir,
+      "waves": args.waves,
   }
   try:
     if args.simulator == "icarus":