Unable to produce dump.vcd file using run function with Verilator #267
Description
Description
I am unable to generate the dump.vcd waveform file when using the run function from cocotb-test.
Steps for reproduce:
1. Environment setup
cocotb-test version: 0.2.5
Python version: 3.9.16
Verilator version: 5.030
cocotb version: 1.9.2
OS: CentOS 7
2. Run the following Python code:
from cocotb_test.simulator import run
run(
verilog_sources=["path/to/your.sv"], # Replace with your Verilog source file path
simulator="verilator",
toplevel="toplevel_module_name", # Replace with your top-level module name
module="test", # Replace with your test module name
extra_args=["--trace", "--trace-structs"],
plus_args=["--trace"],
waves=True,
force_compile=False
)
Expected Behavior: The dump.vcd file should be produced in the expected output location, containing the simulation waveforms.
Actual Behavior: The simulation runs without errors, but the dump.vcd file is not generated.
Additional Notes
- I also tried variations in the run configuration, such as moving "--trace-structs" from extra_args to plus_args, but the issue persists.
- This issue might be related to how Verilator interacts with cocotb-test, or there could be a missing configuration step.