Sergey Lyubka cpq

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Founder, Director at Cesanta. In the past: Engineering Manager at Google, CTO at NetFort

cpq / preact.html

Last active July 16, 2019 14:40

minimal preact app with ES3 syntax

	<html>
	<head>
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
	<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
	<script src="https://unpkg.com/preact"></script>
	</head>
	<body> </body>
	<script>
	var h = preact.h;
	var App = function(props) {

cpq / pwa-preact-bulma.html

Created July 19, 2019 09:35

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>mDash Smart Light</title>
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.5/css/bulma.min.css">
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
	<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

cpq / parser.c

Last active September 1, 2019 18:07

Simple recursive descent expression parser

	// Copyright (c) 2019 Sergey Lyubka
	// All rights reserved

	#include <stdio.h>
	#include <string.h>

	enum { TOK_EOF = '#', TOK_NUM = 'N', TOK_IDENT = 'I' };
	enum { ERR_OK, ERR_EXPECTED_NUM, ERR_EXPECTED_PAREN };
	//#define DEBUG(fmt, ...) printf("%s:" fmt "\n", __func__, __VA_ARGS__)
	#define DEBUG(fmt, ...)

cpq / main.c

Last active September 27, 2019 12:05

ESP-IDF mDash skeleton firmware code

	// Copyright (c) Cesanta Software Limited
	// All rights reserved

	#include "main.h"

	#define REPORT_FREQUENCY_MS 5000

	// This function is called by the main superloop every 10ms.
	// We trigger shadow update each REPORT_FREQUENCY_MS milliseconds.
	// The other way to do it is to start a dedicated FreeRTOS task.

cpq / print_linked_list.c

Created September 7, 2019 14:25

Print singly linked list in reverse order

	#include <stdio.h>

	struct entry {
	int value;
	struct entry *next;
	};

	static void out(struct entry *e) {
	if (e->next != NULL) out(e->next);
	printf("%d\n", e->value);

cpq / min.html

Created November 1, 2019 22:31

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>hiii</title>
	<meta charset="utf-8" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<link rel="stylesheet" href="https://unpkg.com/bootstrap@4.3.1/dist/css/bootstrap.min.css" />
	<script src="https://unpkg.com/preact@8.4.2"></script>
	<script src="https://unpkg.com/htm@2.2.1"></script>

cpq / read_json.c

Last active November 5, 2019 17:59

	char read_file(const char path) {
	FILE *fp;
	char *data = NULL;
	if ((fp = fopen(path, "rb")) == NULL) {
	} else if (fseek(fp, 0, SEEK_END) != 0) {
	fclose(fp);
	} else {
	size_t size = ftell(fp);
	data = (char *) malloc(size + 1);
	if (data != NULL) {

cpq / wsserver.js

Created November 21, 2019 11:36

	const WebSocket = require('ws'); // npm install -g ws
	const server = new WebSocket.Server({port: 8000}, function() {
	console.log('WS server started');
	});
	server.on('connection', function connection(ws, req) {
	let i = 0;
	ws.on('message', function incoming(message) {
	console.log('received', message);
	});
	console.log('connected', req.connection.remoteAddress);

cpq / passthrough.ino

Created July 4, 2020 08:52

	static int BAUD = 115200, RTS = -1, DTR = -1, ESP32_GPIO = 11, ESP32_RESETN = 12;

	void setup() {
	Serial.begin(baud);
	Serial1.begin(baud);
	pinMode(ESP32_GPIO0, OUTPUT);
	pinMode(ESP32_RESETN, OUTPUT);

	// Reset ESP32, put into upload mode
	digitalWrite(ESP32_GPIO0, LOW);

cpq / UartControl.ino

Created August 30, 2020 14:46

	void setup() {
	Serial.begin(115200);
	pinMode(LED_BUILTIN, OUTPUT);
	}

	void loop() {
	if (Serial.available() > 0) {
	int character = Serial.read();
	if (character == '0') digitalWrite(LED_BUILTIN, LOW); // '0' switches LED off
	if (character == '1') digitalWrite(LED_BUILTIN, HIGH); // '1' switches LED on