vcd-writer

Port PyVCD package from python to C++

Visit PyVCD on GitHub.

It writes Value Change Dump (VCD) files as specified in IEEE 1364-2005.

Install

# install gtests (ubuntu)
sudo apt-get install libgtest-dev

# compile library and tests
make

# run simple test
./test/main

# run unit tests
./test/test

Default result:

build/libvcdwriter.a    # static library
build/libvcdwriter.so   # shared library
build/main              # simple test execution file
build/test              # unit tests  execution file

Quick Start

	#include "vcd_writer.h"
	using namespace vcd;

	HeadPtr head = makeVCDHeader(TimeScale::ONE, TimeScaleUnit::ns, utils::now());
	std::string filename = "dump.vcd";
	VCDWriter writer(filename, head);
	VarPtr counter_var = writer.register_var("a.b.c", "counter", VariableType::integer, 8);
	VarPtr var_var = writer.register_var("a.b", "var", VariableType::integer, 8);
	for (int timestamp = 0; timestamp < 5; ++timestamp)
	{
		const int c_val = 10 + timestamp * 2;
		const int v_val = 11 + timestamp * 2;
		writer.change(counter_var, timestamp, std::bitset<8>(c_val).to_string());
		writer.change(var_var, timestamp, std::bitset<8>(v_val).to_string());
	}

Output:

$timescale 1 ns $end
$date 2022-04-18 11:12:38 $end
$scope module a $end
$scope module b $end
$var integer 8 1 var $end
$upscope $end
$scope module b $end
$scope module c $end
$var integer 8 0 counter $end
$upscope $end
$upscope $end
$upscope $end
$enddefinitions $end
#0
$dumpvars
b00001010 0
b00001011 1
$end
#1
b00001100 0
b00001101 1
#2
b00001110 0
b00001111 1
#3
b00010000 0
b00010001 1
#4
b00010010 0
b00010011 1