GaryLee’s gists

GaryLee / circular_buffer.h

Created March 8, 2025 15:06

The circular buffer class in c++.

	/**
	* @file circular_buffer.h The circular buffer.
	*/

	#ifndef CIRCULAR_BUFFER_H
	#define CIRCULAR_BUFFER_H

	/**
	* @brief The circular buffer class.
	*/

GaryLee / lpf_zdomain.py

Created October 28, 2024 07:10

How to calculate the coefficient of low-pass filter of z-domain?

	#!python

	from math import pi

	# The first-order low-pass filter has following transfer function of s-domain
	# H(s) = a / (s + a).
	# Its pole is s = −a, and the pole in digital filter will be z = e^−aT
	# Therefore the H(z) is (1 - e^-aT)*z / ( z - e^-aT )
	FREQ_SAMPLING = 50e3
	TIME_SAMPLING = 1 / FREQ_SAMPLING

GaryLee / simple_kalman_filter_demo.py

Last active October 29, 2024 01:55

	#!python
	# coding: utf-8

	import numpy as np
	import matplotlib.pyplot as plt

	dt = 0.1 # The time interval of sampling.

	# Make input data with some white noise.
	z = np.arange(1, 100, dt)

GaryLee / make_reg_svg.py

Created August 31, 2024 10:07

A example to generate register definition with drawsvg module.

	#!python
	# -- coding: utf-8 --

	import drawsvg as draw


	# Reference: https://github.com/cduck/drawsvg/blob/master/docs/index.md

	reg = {
	'31': 'EN',

GaryLee / coding_style_format.sh

Created August 29, 2024 01:41

My setting of coding style of verilog. Use verible-verilog-format to re-format the code.

	#!/bin/sh
	verible-verilog-format \
	--inplace \
	--column_limit=200 \
	--indentation_spaces=4 \
	--line_break_penalty=4 \
	--assignment_statement_alignment=align \
	--case_items_alignment=align \
	--class_member_variable_alignment=align \
	--formal_parameters_alignment=align \

GaryLee / tasks.py

Last active December 16, 2024 01:47

An example showing how to use invoke as standalone program.

	#!python
	# coding: utf-8

	import sys
	from invoke import task, Program, Collection

	@task
	def task1(c):
	# c.run will invoke a shell context to run the commands.
	c.run("echo Put your first task command here.")

GaryLee / toml2tmpl.py

Last active July 31, 2024 06:42

Generate document with TOML and MAKO template.

	#!python3
	# coding: utf-8

	import sys
	from os import path
	import tomli as toml
	from mako.template import Template

	def main():
	if len(sys.argv) != 3:

GaryLee / pip_proxy_install.sh

Last active June 26, 2024 03:26

How to use proxy to do PIP/YUM/DNF installation.

	# Refer to https://stackoverflow.com/questions/48343669/how-to-install-python-packages-over-ssh-port-forwarding.

	# Login to server via following ssh command. Your computer must have permission to connect to PIP server directly.
	ssh -R 9999 [email protected]

	# After login to your server.host.name. Use following command to install proxy package.
	pip install package_name --proxy socks5h:127.0.0.1:9999

	# The apt and yum can work with this tunnel by setting proxy.
	# Add following line in /etc/yum.conf

GaryLee / least_sqrt_root.py

Created June 24, 2024 00:35

Simple linear regression example using least square root for solution.

	import numpy as np

	def linear_regression(x, y):
	"""The input are x and y for 2D"""
	assert isinstance(x, np.ndarray)
	assert isinstance(y, np.ndarray)
	w = np.sum((y - np.average(y)) * x) / np.sum((x - np.average(x))**2)
	b = np.average(y) - w * np.average(x)
	return w, b

GaryLee / parse_verilog_number.py

Last active June 17, 2024 02:41

Parse verilog number literal.

	def parse_verilog_number(s):
	"""Parse a verilog number literal to the tuple (sign, bits, base, value).
	sign: 1 for postive, -1 for negative.
	bits: The bits token in the number literal.
	base: The base of number(2, 10 or 16).
	value: The value token.
	"""
	base_token = {'b': 2, 'd': 10, 'h': 16}
	pattern = re.compile(r"""(?P<sign>[\-\+])?(?P<define>\`)?(?P<bits>[\w]+)?\'((?P<base2>[bB])(?P<value2>[01]+)\|(?P<base10>[dD])(?P<value10>\d+)\|(?P<base16>[hH])(?P<value16>[0-9a-fA-F]+)\|(?P<value>\d+))""")
	m = pattern.match(s)

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