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1 Commits
lcd ... 984a429cc0

Author SHA1 Message Date
Shaun Reed
984a429cc0 [cpp] Remove ignores 2022-12-24 10:16:37 -05:00
69 changed files with 603 additions and 12403 deletions
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2
.gitignore vendored
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@@ -10,5 +10,5 @@
**/Makefile
**/*.cbp
**/node-modules/
**/CMakeLists.txt.user
**/CmakeLists.txt.user
**/catch2/bin/

11
README.md
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@@ -2,16 +2,15 @@
This repository is a collection of useful code snippets and configurations.
```bash
shaunrd0/klips/
```
github.com/shaunrd0/klips/
├── ansible # Ansible roles, playbooks, and examples
├── blockchain # Blockchain related project templates and examples
├── cpp # C++ programs, datastructures, and other examples
├── dotnet # .NET projects and examples
├── esp # ESP32 projects and examples
├── figlet # Figlet fonts I like :)
├── javascript # Javascript projects and examples
├── python # Python scripts and tools I've made
├── scripts # Bash scripts
└── README.md
├── python # Python scripts or tools I've made
├── README.md
└── scripts # Bash scripts
```

2
ansible/README.md
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@@ -1,4 +1,4 @@
# ansible
# Ansible
A few simple roles / plays I've put together in learning how to use Ansible can be found under their corresponding directories.

1
blockchain/eth/truffle-solidity/README.md
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@@ -1,4 +1,3 @@
# blockchain
A template project for getting started working on the Ethereum blockchain.
This project comes with basic packages for compiling and deploying Solidity contracts with Truffle.

2
cpp/README.md
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@@ -1,4 +1,4 @@
# cpp
# Cpp
```bash
shaunrd0/klips/cpp/

197
cpp/qt/designer-plugin-collection/CMakeLists.txt.user Normal file
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@@ -0,0 +1,197 @@
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dotnet/README.md
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# dotnet
# Dotnet
```bash
shaunrd0/klips/dotnet/

38
esp/cpp/01_led-button/01_led-button.ino
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// set pin numbers
const int buttonPin = 4; // the number of the pushbutton pin
const int ledPin = 5; // the number of the LED pin
// variable for storing the pushbutton status
int buttonState = 0;
bool light_on = false;
bool handled = false;
void setup() {
Serial.begin(115200);
// initialize the pushbutton pin as an input
pinMode(buttonPin, INPUT);
// initialize the LED pin as an output
pinMode(ledPin, OUTPUT);
}
void loop() {
// read the state of the pushbutton value
buttonState = digitalRead(buttonPin);
// check if the pushbutton is pressed.
if (buttonState == HIGH) {
if (!handled) {
Serial.println("Handling button pressed.");
light_on = !light_on;
handled = true;
digitalWrite(ledPin, light_on ? HIGH : LOW);
}
// turn LED on
} else {
if (handled) {
Serial.println("Reset button handled state.");
handled = false;
}
}
}

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esp/cpp/01_led-button/README.md
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# 01_led-button
This example is largely adapted from those in [ESP32-basic-starter-kit.pdf](./ESP32-basic-starter-kit.pdf).
The APIs in the original examples paired with this PDF have changed, and I decided to do some different things with the code and/or circuits, but the original code can be [found here](https://www.dropbox.com/scl/fo/6znlij3eb23ih4jxcpv2w/AKvB1t9CCUgoVRVtGen8Yrw?rlkey=z84anl0hs940qf9fpl7l8q8q2&e=1&dl=0).
![schematic](./schematic.png)
Simple LED controlled by an on-board button.

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esp/cpp/02_led-button-web/02_led-button-web.ino
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#include <WiFi.h>
//
// Web server project globals
// Replace with your network credentials
const char* ssid = "network-name";
const char* password = "password";
WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;
//
// Button / light project globals
// set pin numbers
const int buttonPin = 4; // the number of the pushbutton pin
const int ledPin = 5; // the number of the LED pin
// variable for storing the pushbutton status
int buttonState = 0;
bool light_on = false;
bool handled = false;
void setup() {
Serial.begin(115200);
// initialize the pushbutton pin as an input
pinMode(buttonPin, INPUT);
// initialize the LED pin as an output
pinMode(ledPin, OUTPUT);
// wait for the Serial Monitor to be open
while (!Serial) {
delay(100);
}
// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// Print local IP address and start web server
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("Web Server IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
// Handles the on-board button press.
void handleButtonPress() {
// read the state of the pushbutton value
buttonState = digitalRead(buttonPin);
// check if the pushbutton is pressed.
if (buttonState == HIGH) {
if (!handled) {
Serial.println("Handling button pressed.");
light_on = !light_on;
handled = true;
digitalWrite(ledPin, light_on ? HIGH : LOW);
}
// turn LED on
} else {
if (handled) {
Serial.println("Reset button handled state.");
handled = false;
}
}
}
void displayPinState(WiFiClient client, int gpio_pin, bool state) {
// Display current state, and ON/OFF buttons for GPIO <gpio_pin>
client.println(String("<p>GPIO ") + String(gpio_pin) + String(" - Current State ") + String(state ? "ON" : "OFF") + String("</p>"));
// If the output state is off, it displays the ON button
if (state) {
client.println(String("<p><a href=\"/") + String(gpio_pin) + String("/off\"><button class=\"button button2\">OFF</button></a></p>"));
} else {
client.println(String("<p><a href=\"/") + String(gpio_pin) + String("/on\"><button class=\"button\">ON</button></a></p>"));
}
}
void handleStateChange(WiFiClient client, int gpio_pin) {
if (header.indexOf(String("GET /") + String(gpio_pin) + String("/on")) >= 0) {
Serial.println(String("GPIO ") + String(gpio_pin) + String(" on"));
light_on = true;
digitalWrite(gpio_pin, HIGH);
} else if (header.indexOf(String("GET /") + String(gpio_pin) + String("/off")) >= 0) {
Serial.println(String("GPIO ") + String(gpio_pin) + String(" off"));
light_on = false;
digitalWrite(gpio_pin, LOW);
}
}
void loop() {
WiFiClient client = server.available(); // Listen for incoming clients
handleButtonPress();
if (client) { // If a new client connects,
currentTime = millis();
previousTime = currentTime;
Serial.println("New Client."); // print a message out in the serial port
Serial.println("Web Server IP address: ");
Serial.println(WiFi.localIP());
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected
// Also handle the button press in this loop to not miss events.
handleButtonPress();
currentTime = millis();
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
// turns the GPIOs on and off
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #555555;}</style></head>");
//
// Web Page Heading
client.println("<body><h1>ESP32 Web Server</h1>");
//
// Web Page Body Contents
// Button Controls
displayPinState(client, ledPin, light_on);
//
// Close Web Page Body / Heading
client.println("</body></html>");
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}

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esp/cpp/02_led-button-web/README.md
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# 02_led-button-web
This example is largely adapted from those in [ESP32-basic-starter-kit.pdf](./ESP32-basic-starter-kit.pdf).
The APIs in the original examples paired with this PDF have changed, and I decided to do some different things with the code and/or circuits, but the original code can be [found here](https://www.dropbox.com/scl/fo/6znlij3eb23ih4jxcpv2w/AKvB1t9CCUgoVRVtGen8Yrw?rlkey=z84anl0hs940qf9fpl7l8q8q2&e=1&dl=0).
![schematic](./schematic.png)
This example uses the same schematic as [01_led-button](../01_led-button/).
The only difference is that you can also control the button through a web browser from any device connected to your local network.
This example was adapted from the example code in the [Arduino ESP32 API reference](https://docs.espressif.com/projects/arduino-esp32/en/latest/api/wifi.html#wi-fi-ap-example).
![screenshot](./screenshot.png)

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161
esp/cpp/03_temp-humidity-web/03_temp-humidity-web.ino
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// Import required libraries
#include "WiFi.h"
#include "ESPAsyncWebServer.h"
#include <Adafruit_Sensor.h>
#include <DHT.h>
// Replace with your network credentials
const char* ssid = "network-name";
const char* password = "password";
#define DHTPIN 4 // Digital pin connected to the DHT sensor
// Uncomment the type of sensor in use:
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
DHT dht(DHTPIN, DHTTYPE);
// Create AsyncWebServer object on port 80
AsyncWebServer server(80);
String readDHTTemperature() {
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
//float t = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return "--";
}
else {
Serial.println(t);
return String(t);
}
}
String readDHTHumidity() {
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
if (isnan(h)) {
Serial.println("Failed to read from DHT sensor!");
return "--";
}
else {
Serial.println(h);
return String(h);
}
}
const char index_html[] PROGMEM = R"rawliteral(
<!DOCTYPE HTML><html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<style>
html {
font-family: Arial;
display: inline-block;
margin: 0px auto;
text-align: center;
}
h2 { font-size: 3.0rem; }
p { font-size: 3.0rem; }
.units { font-size: 1.2rem; }
.dht-labels{
font-size: 1.5rem;
vertical-align:middle;
padding-bottom: 15px;
}
</style>
</head>
<body>
<h2>ESP32 DHT Server</h2>
<p>
<i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
<span class="dht-labels">Temperature</span>
<span id="temperature">%TEMPERATURE%</span>
<sup class="units">&deg;C</sup>
</p>
<p>
<i class="fas fa-tint" style="color:#00add6;"></i>
<span class="dht-labels">Humidity</span>
<span id="humidity">%HUMIDITY%</span>
<sup class="units">&percnt;</sup>
</p>
</body>
<script>
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("temperature").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/temperature", true);
xhttp.send();
}, 10000 ) ;
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("humidity").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/humidity", true);
xhttp.send();
}, 10000 ) ;
</script>
</html>)rawliteral";
// Replaces placeholder with DHT values
String processor(const String& var){
//Serial.println(var);
if(var == "TEMPERATURE"){
return readDHTTemperature();
}
else if(var == "HUMIDITY"){
return readDHTHumidity();
}
return String();
}
void setup(){
// Serial port for debugging purposes
Serial.begin(115200);
dht.begin();
// Connect to Wi-Fi
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi..");
}
// Print ESP32 Local IP Address
Serial.println(WiFi.localIP());
// Route for root / web page
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/html", index_html, processor);
});
server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", readDHTTemperature().c_str());
});
server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", readDHTHumidity().c_str());
});
// Start server
server.begin();
}
void loop(){
}

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# 03_temp-humidity-web
This example is largely adapted from those in [ESP32-basic-starter-kit.pdf](./ESP32-basic-starter-kit.pdf).
The APIs in the original examples paired with this PDF have changed, and I decided to do some different things with the code and/or circuits, but the original code can be [found here](https://www.dropbox.com/scl/fo/6znlij3eb23ih4jxcpv2w/AKvB1t9CCUgoVRVtGen8Yrw?rlkey=z84anl0hs940qf9fpl7l8q8q2&e=1&dl=0).
![schematic](./schematic.png)
Temperature and humidity sensor served on a web page within the local network.
![screenshot](./screenshot.png)
## Dependencies
You need to install a couple of libraries for this project:
* The DHT and the Adafruit Unified Sensor Driver libraries to read from the DHT sensor.
* ESPAsyncWebServer and Async TCP libraries to build the asynchronous web server.
The default Arduino IDE installation will store libraries at `~/Arduino/ibraries` - if this directory doesn't exist, create it.
### Installing DHT Sensor Library
To read from the DHT sensor using Arduino IDE, you need to install the [DHT sensor library](https://github.com/adafruit/DHT-sensor-library).
```bash
wget -O DHT_sensor.zip https://github.com/adafruit/DHT-sensor-library/archive/master.zip
unzip DHT_sensor.zip
mv DHT-sensor-library-master/ ~/Arduino/libraries/DHT_sensor
```
## Install Adafruit Unified Sensor Driver Library
You also need to install the [Adafruit Unified Sensor Driver library](https://github.com/adafruit/Adafruit_Sensor) to work with the DHT sensor.
```bash
wget -O Adafruit_sensor.zip https://github.com/adafruit/Adafruit_Sensor/archive/master.zip
unzip Adafruit_sensor.zip
mv Adafruit_Sensor-master/ ~/Arduino/libraries/Adafruit_sensor
```
## Installing ESPAsyncWebServer Library
Follow the next steps to install the [ESPAsyncWebServer library](https://github.com/me-no-dev/ESPAsyncWebServer):
```bash
wget -O ESPAsyncWebServer.zip https://github.com/me-no-dev/ESPAsyncWebServer/archive/master.zip
unzip ESPAsyncWebServer.zip
mv ESPAsyncWebServer-master/ ~/Arduino/libraries/ESPAsyncWebServer
```
## Installing Async TCP Library
The ESPAsyncWebServer library requires the [AsyncTCP library](https://github.com/me-no-dev/AsyncTCP) to work. Follow the next steps to install that library:
```bash
wget -O AsyncTCP.zip https://github.com/me-no-dev/AsyncTCP/archive/master.zip
unzip AsyncTCP.zip
mv AsyncTCP-master/ ~/Arduino/libraries/AsyncTCP
```

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build
managed_components
dependencies.lock
sdkconfig.old

18
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# For more information about build system see
# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
# The following five lines of boilerplate have to be in your project's
# CMakeLists in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.26)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(
#[[NAME]] esp-idf-arduino
VERSION 0.1
DESCRIPTION "Example ESP-IDF cmake project"
LANGUAGES CXX
)
# For writing pure cmake components, see the documentation
# https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/build-system.html#writing-pure-cmake-components
idf_build_set_property(COMPILE_OPTIONS "-Wno-error" APPEND)

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# 04_esp-idf-arduino
There is no schematic for this example, it simply prints some output to the serial monitor at 115200.
This is more of a build system example for untethering yourself from the Arduino IDE.
To build this example you can run the following commands.
```bash
# See Dependencies section below for instructions.
source ~/path/to/esp-idf/export.sh
mkdir build
cd build
cmake ..
make -j $(nproc)
# Flash the example to the ESP.
make flash
# Check the serial monitor for 'Hello world!' output.
idf.py monitor -b 115200
```
To flash to your ESP or access the `idf.py menuconfig` menu from the ESP-IDF you can run the same commands with `make`.
```bash
make flash
make menuconfig
```
If Ninja is preferred:
```bash
mkdir build
cd build
cmake .. -G Nina
ninja
```
## Dependencies
Install the [ESP-IDF](https://github.com/espressif/esp-idf?tab=readme-ov-file#setup-build-environment)
```bash
# https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/get-started/linux-macos-setup.html#for-linux-users
sudo apt-get install -y git wget flex bison gperf python3 python3-pip python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
git clone -b v5.3.2 --recursive https://github.com/espressif/esp-idf
cd esp-idf
./install.sh
. ./export.sh
```
In CLion there is an official [Serial Monitor](https://plugins.jetbrains.com/plugin/8031-serial-port-monitor) plugin, or use ESP-IDF -
```bash
idf.py monitor -b 115200
```
## Starting Over
To set up this project from scratch the following commands were used
```bash
# My example project directory
cd ~/Code/klips/esp/cpp/04_esp-idf-arduino
idf.py set-target esp32
idf.py add-dependency "espressif/arduino-esp32^3.1.1"
# Autostart Arduino for use of `loop()` and `setup()` functions
# You can also use the esp-idf `app_main()` function if preferred
# https://docs.espressif.com/projects/arduino-esp32/en/latest/esp-idf_component.html#configuration
# You can alternatively do this in the GUI tool `idf.py menuconfig`
echo "CONFIG_AUTOSTART_ARDUINO=y" >> sdkconfig
sed -i -e 's/CONFIG_FREERTOS_HZ=100/CONFIG_FREERTOS_HZ=1000/' sdkconfig
# Build the project
idf.py build
```
To set this project up in CLion, see [JetBrains documentation](https://www.jetbrains.com/help/clion/esp-idf.html#env-vars).

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idf_component_register(
SRCS "main.cpp"
INCLUDE_DIRS "."
)

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## IDF Component Manager Manifest File
dependencies:
## Required IDF version
idf:
version: '>=4.1.0'
# # Put list of dependencies here
# # For components maintained by Espressif:
# component: "~1.0.0"
# # For 3rd party components:
# username/component: ">=1.0.0,<2.0.0"
# username2/component2:
# version: "~1.0.0"
# # For transient dependencies `public` flag can be set.
# # `public` flag doesn't have an effect dependencies of the `main` component.
# # All dependencies of `main` are public by default.
# public: true
espressif/arduino-esp32: ^3.1.1

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esp/cpp/04_esp-idf-arduino/main/main.cpp
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#include "Arduino.h"
void setup() {
Serial.begin(115200);
}
void loop() {
Serial.println("Hello world!");
delay(1000);
}

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build
managed_components
dependencies.lock
sdkconfig.old

18
esp/cpp/05_temp-humidity-web/CMakeLists.txt
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# For more information about build system see
# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
# The following five lines of boilerplate have to be in your project's
# CMakeLists in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.26)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(
#[[NAME]] temp-humidity-web
VERSION 0.1
DESCRIPTION "Temperature and humidity from DHT sensor served on a web page"
LANGUAGES CXX
)
# For writing pure cmake components, see the documentation
# https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/build-system.html#writing-pure-cmake-components
idf_build_set_property(COMPILE_OPTIONS "-Wno-error" APPEND)

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# 05_temp-humidity-web
This is the same example in [03_temp-humidity-web](./../03_temp-humidity-web), ported to the cmake ESP-IDF build system.
For instructions on setting up the ESP-IDF see [04_-esp-idf-arduino](./../04_esp-idf-arduino)
This example is largely adapted from those in [ESP32-basic-starter-kit.pdf](./ESP32-basic-starter-kit.pdf).
The APIs in the original examples paired with this PDF have changed, and I decided to do some different things with the code and/or circuits, but the original code can be [found here](https://www.dropbox.com/scl/fo/6znlij3eb23ih4jxcpv2w/AKvB1t9CCUgoVRVtGen8Yrw?rlkey=z84anl0hs940qf9fpl7l8q8q2&e=1&dl=0).
![schematic](./schematic.png)
Temperature and humidity sensor served on a web page within the local network.
![screenshot](./screenshot.png)
To build this example run the following commands.
```bash
source ~/path/to/esp-idf/export.sh
mkdir build
cd build
cmake ..
make -j $(nproc)
make flash
```

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idf_component_register(
SRCS "main.cpp"
INCLUDE_DIRS "."
)

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esp/cpp/05_temp-humidity-web/main/idf_component.yml
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@@ -1,19 +0,0 @@
## IDF Component Manager Manifest File
dependencies:
## Required IDF version
idf:
version: '>=4.1.0'
# # Put list of dependencies here
# # For components maintained by Espressif:
# component: "~1.0.0"
# # For 3rd party components:
# username/component: ">=1.0.0,<2.0.0"
# username2/component2:
# version: "~1.0.0"
# # For transient dependencies `public` flag can be set.
# # `public` flag doesn't have an effect dependencies of the `main` component.
# # All dependencies of `main` are public by default.
# public: true
espressif/arduino-esp32: ^3.1.1
zorxx/dht: ^1.0.1
esp32async/espasyncwebserver: ^3.7.0~1

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#include "WiFi.h"
#include "ESPAsyncWebServer.h"
#include "main.h"
// Replace with your network credentials
const char *ssid = "wifi";
const char *password = "password";
#define DHTPIN GPIO_NUM_4 // Digital pin connected to the DHT sensor
// Uncomment the type of sensor in use:
#define DHTTYPE DHT_TYPE_DHT11 // DHT 11
//#define DHTTYPE DHT_TYPE_DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT_TYPE_DHT21 // DHT 21 (AM2301)
float DHT::readTemperature(bool f)
{
float humidity = 0;
float temperature = 0;
esp_err_t result = dht_read_float_data(type_, gpio_, &humidity,
&temperature);
if (result == ESP_OK) {
ESP_LOGI("[DHT::readTemperature]", "Humidity: %.1f%% Temperature: %.1f°C",
humidity,
temperature);
} else {
ESP_LOGE("[DHT::readTemperature]", "Failed to read sensor data: %s",
esp_err_to_name(result));
}
return f ? (temperature * 1.8f) + 32 : temperature;
}
float DHT::readHumidity()
{
float humidity = 0;
float temperature = 0;
esp_err_t result = dht_read_float_data(type_, gpio_, &humidity,
&temperature);
if (result == ESP_OK) {
ESP_LOGI("[DHT::readTemperature]", "Humidity: %.1f%% Temperature: %.1f°C",
humidity,
temperature);
} else {
ESP_LOGE("[DHT::readTemperature]", "Failed to read sensor data: %s",
esp_err_to_name(result));
}
return humidity;
}
DHT dht(DHTPIN, DHTTYPE);
// Create AsyncWebServer object on port 80
AsyncWebServer server(80);
String readDHTTemperature()
{
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float t = dht.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return "--";
} else {
Serial.println(t);
return String(t);
}
}
String readDHTHumidity()
{
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
if (isnan(h)) {
Serial.println("Failed to read from DHT sensor!");
return "--";
} else {
Serial.println(h);
return String(h);
}
}
const char index_html[] PROGMEM = R"rawliteral(
<!DOCTYPE HTML><html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<style>
html {
font-family: Arial;
display: inline-block;
margin: 0px auto;
text-align: center;
}
h2 { font-size: 3.0rem; }
p { font-size: 3.0rem; }
.units { font-size: 1.2rem; }
.dht-labels{
font-size: 1.5rem;
vertical-align:middle;
padding-bottom: 15px;
}
</style>
</head>
<body>
<h2>ESP32 DHT Server</h2>
<p>
<i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
<span class="dht-labels">Temperature</span>
<span id="temperature">%TEMPERATURE%</span>
<sup class="units">&deg;C</sup>
</p>
<p>
<i class="fas fa-tint" style="color:#00add6;"></i>
<span class="dht-labels">Humidity</span>
<span id="humidity">%HUMIDITY%</span>
<sup class="units">&percnt;</sup>
</p>
</body>
<script>
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("temperature").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/temperature", true);
xhttp.send();
}, 10000 ) ;
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("humidity").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/humidity", true);
xhttp.send();
}, 10000 ) ;
</script>
</html>)rawliteral";
// Replaces placeholder with DHT values
String processor(const String &var)
{
//Serial.println(var);
if (var == "TEMPERATURE") {
return readDHTTemperature();
} else if (var == "HUMIDITY") {
return readDHTHumidity();
}
return String();
}
void setup()
{
// Serial port for debugging purposes
Serial.begin(115200);
// Connect to Wi-Fi
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi..");
}
// Print ESP32 Local IP Address
Serial.println(WiFi.localIP());
// Route for root / web page
server.on("/", HTTP_GET, [ ](AsyncWebServerRequest *request) {
request->send(200, "text/html", index_html, processor);
});
server.on("/temperature", HTTP_GET, [ ](AsyncWebServerRequest *request) {
request->send(200, "text/plain", readDHTTemperature().c_str());
});
server.on("/humidity", HTTP_GET, [ ](AsyncWebServerRequest *request) {
request->send(200, "text/plain", readDHTHumidity().c_str());
});
// Start server
server.begin();
}
void loop()
{
}

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#ifndef MAIN_H
#define MAIN_H
#include <cstdint>
#include "dht.h"
class DHT {
public:
DHT(gpio_num_t gpio, dht_sensor_type_t type) :
gpio_(gpio), type_(type) { }
~DHT() = default;
/**
* Read temperature from DHT sensor
*
* @param f True to return in Fahrenheit, False for Celsius.
*/
float readTemperature(bool f = true);
/**
* Read humidity from DHT sensor.
*/
float readHumidity();
private:
gpio_num_t gpio_;
dht_sensor_type_t type_;
};
#endif // MAIN_H

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build
managed_components
dependencies.lock
sdkconfig.old

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# For more information about build system see
# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
# The following five lines of boilerplate have to be in your project's
# CMakeLists in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.26)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(
#[[NAME]] i2c-scanner
VERSION 0.1
DESCRIPTION "Simple I2C device scanner"
LANGUAGES CXX
)
# For writing pure cmake components, see the documentation
# https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/build-system.html#writing-pure-cmake-components
idf_build_set_property(COMPILE_OPTIONS "-Wno-error" APPEND)

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# 06_i2c-scanner
![schematic](./schematic.png)
Simple I2C device scanner.
For this example I used this [SSD1306 OLED display](https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255).
To build the example run the following commands.
```bash
source ~/path/to/esp-idf/export.sh
mkdir build
cd build
cmake ..
make -j $(nproc)
# Flash to ESP32
make flash
# Open Serial Monitor, press CTRL+] to exit.
make monitor
```
Expected output in serial monitor at 115200 baud
```bash
Scanning I2C devices...
[0x3c]: Device found with clock rate 100000 and timeout 50
Done.
```

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@@ -1,4 +0,0 @@
idf_component_register(
SRCS "main.cpp"
INCLUDE_DIRS "."
)

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esp/cpp/06_i2c-scanner/main/idf_component.yml
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@@ -1,17 +0,0 @@
## IDF Component Manager Manifest File
dependencies:
## Required IDF version
idf:
version: '>=5.3.0'
# # Put list of dependencies here
# # For components maintained by Espressif:
# component: "~1.0.0"
# # For 3rd party components:
# username/component: ">=1.0.0,<2.0.0"
# username2/component2:
# version: "~1.0.0"
# # For transient dependencies `public` flag can be set.
# # `public` flag doesn't have an effect dependencies of the `main` component.
# # All dependencies of `main` are public by default.
# public: true
espressif/arduino-esp32: ^3.1.1

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#include "Arduino.h"
#include "Wire.h"
[[maybe_unused]] static const char *TAG = "i2c-scanner";
void i2c_scan()
{
uint8_t device_num = 0;
Serial.println("Scanning I2C devices...");
for (byte address = 1; address < 127; address++) {
Wire.beginTransmission(address);
byte error = Wire.endTransmission();
if (error == 0) {
Serial.printf(
"[0x%.2x]: Device found with clock rate %lu and timeout %u\n",
address,
Wire.getClock(), Wire.getTimeOut());
device_num++;
} else if (error == 4) {
Serial.printf("[0x%.2x]: Unknown error.\n", address);
}
}
Serial.println(device_num > 0 ? "Done.\n" : "No I2C devices found.\n");
}
void setup()
{
Serial.begin(115200);
Wire.begin();
}
void loop()
{
i2c_scan();
}

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build
managed_components
dependencies.lock
sdkconfig.old

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# For more information about build system see
# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
# The following five lines of boilerplate have to be in your project's
# CMakeLists in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.26)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(
#[[NAME]] lcd-panel-i2c
VERSION 0.1
DESCRIPTION "Using the SSD1306 LCD display with ESP-IDF and LVGL over I2C"
LANGUAGES CXX
)
# For writing pure cmake components, see the documentation
# https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-guides/build-system.html#writing-pure-cmake-components
idf_build_set_property(COMPILE_OPTIONS "-Wno-error" APPEND)

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# 07_lcd-panel-i2c
Using the ESP IDF for drawing to a LCD screen over I2C.
[ESP IDF - I2C](https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/api-reference/peripherals/i2c.html)
[ESP IDF - LCD](https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/api-reference/peripherals/lcd/index.html)
[ESP IDF - FreeRTOS](https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/api-reference/system/freertos.html)
![schematic](./schematic.png)
![example](./example.gif)
For instructions on setting up the ESP-IDF see [04_-esp-idf-arduino](./../04_esp-idf-arduino)
To build this example run the following commands.
```bash
source ~/path/to/esp-idf/export.sh
mkdir build
cd build
cmake ..
make -j $(nproc)
make flash
```

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idf_component_register(
SRCS
main.cpp display.cpp panel_device.cpp scoped_lock.cpp
i2c.h time_keeper.h panel.h ssd1306.h
INCLUDE_DIRS .
REQUIRES driver
)

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#include <lv_init.h>
#include "display.h"
// Static TimeKeeper for managing ESP timers across all displays.
TimeKeeper Display::timers_;
Display::Display(IPanelDevice &device) :
panel_(device)
{
if (!lv_is_initialized()) {
ESP_LOGI(TAG, "Initialize LVGL");
lv_init();
}
ESP_LOGI(TAG, "Creating LVGL display");
lv_display_ = panel_.device_->create_display();
// associate the i2c panel handle to the display
lv_display_set_user_data(lv_display_, panel_.esp_panel_);
panel_.register_display_callbacks(lv_display_);
}
void Display::set_text(const char *text,
const char *name,
lv_label_long_mode_t long_mode,
lv_align_t align)
{
// Lock the mutex due to the LVGL APIs are not thread-safe.
ScopedLock lock;
ESP_LOGI(TAG, "Display LVGL Scroll Text");
lv_obj_t *scr = lv_display_get_screen_active(lv_display_);
// Create the label if it's `name` doesn't already exist in the map keys.
if (!lv_objects_.count(name)) {
lv_objects_[name] = lv_label_create(scr);
}
auto obj = lv_objects_[name];
// Set text and long mode.
lv_label_set_long_mode(obj, long_mode);
lv_label_set_text(obj, text);
// Set the size of the screen.
// If you use rotation 90 or 270 use lv_display_get_vertical_resolution.
lv_obj_set_width(obj, lv_display_get_horizontal_resolution(lv_display_));
lv_obj_align(obj, align, 0, 0);
}

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef DISPLAY_H
#define DISPLAY_H
#include <widgets/label/lv_label.h>
#include <unordered_map>
#include "time_keeper.h"
#include "panel.h"
#include "scoped_lock.h"
/**
* Encapsulates lv_display handle and related LVGL operations.
* Contains helper methods that wrap basic LVGL operations such as drawing text.
* The underlying lv_display can be obtained for manual LVGL operations.
* @sa ScopedLock
* @sa Display::get()
*/
class Display {
public:
/**
* Construct a new Display using an object that implements IPanelDevice.
*
* @param device An object that implements the IPanelDevice interface.
*/
explicit Display(IPanelDevice &device);
~Display() = default;
Display(const Display &) = delete;
Display(Display &) = delete;
Display &operator=(Display &) = delete;
using lv_display_handle_t = lv_display_t *;
//
// GETTERS
/**
* Getter for accessing LVGL display handle.
*
* @sa ScopedLock for calling custom LVGL API's not implemented by Display.
*/
[[nodiscard]] inline lv_display_handle_t get() const { return lv_display_; }
/**
* Getter for accessing LVGL display handle.
*
* @sa ScopedLock for calling custom LVGL API's not implemented by Display.
*/
[[nodiscard]] inline lv_display_handle_t get() { return lv_display_; }
/// Dereference operator for accessing LVGL display handle.
[[nodiscard]] inline lv_display_handle_t operator*() const { return get(); }
/// Dereference operator for accessing LVGL display handle.
[[nodiscard]] inline lv_display_handle_t operator*() { return get(); }
//
// LVGL OPERATIONS
/**
* Create a LVGL label with some given text on the current display.
* The name of the object can be reused to change text on this label later.
*
* @param text Text to write to the display.
* @param name Name for the LVGL label object associated with this text.
* @param long_mode LVGL long mode for text wider than the current display.
* @param align LVGL alignment to use for placing the label on the display.
*/
void set_text(const char *text,
const char *name,
lv_label_long_mode_t long_mode = LV_LABEL_LONG_SCROLL_CIRCULAR,
lv_align_t align = LV_ALIGN_TOP_MID);
//
// PUBLIC STATIC MEMBERS
/// Public static TimeKeeper for managing ESP timers across all displays.
static TimeKeeper timers_;
private:
//
// PRIVATE MEMBERS
/// Panel associated with this Display.
Panel panel_;
/// LVGL display handle.
lv_display_handle_t lv_display_;
/**
* LVGL object handles stored in the LVGL screen associated with this Display.
*
* @sa Display::set_text
* @sa lv_display_get_screen_active
*/
std::unordered_map<const char *, lv_obj_t *> lv_objects_;
/// Tag used for ESP logging.
constexpr static const char *TAG = "Display";
};
#endif // DISPLAY_H

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef I2C_H
#define I2C_H
#define I2C_BUS_PORT 0
#include <driver/i2c_master.h>
/**
* Encapsulates ESP I2C creation and usage.
*/
struct I2C {
/**
* Construct and initialize an ESP I2C master bus.
* An I2C constructor may only be called one time in any application.
*
* @param sda GPIO pin number for SDA
* @param scl GPIO pin number for SCL
* @param rst GPIO pin number for RST
*/
I2C(gpio_num_t sda, gpio_num_t scl, int rst = -1) :
I2C((i2c_master_bus_config_t) {
.i2c_port = I2C_BUS_PORT,
.sda_io_num = sda,
.scl_io_num = scl,
.clk_source = I2C_CLK_SRC_DEFAULT,
.glitch_ignore_cnt = 7,
.flags {
.enable_internal_pullup = true,
},
},
rst
) { }
/**
* Construct an ESP I2C master bus given a specific ESP I2C configuration.
* An I2C constructor may only be called one time in any application.
*
* @param config ESP I2C master bus configuration.
* @param rst GPIO pin number for RST
*/
explicit I2C(i2c_master_bus_config_t config, int rst = -1) :
esp_bus_config_(config),
rst_num_(rst)
{
i2c_master_bus_handle_t i2c;
ESP_LOGI(TAG, "Initializing new master I2C bus");
ESP_ERROR_CHECK(i2c_new_master_bus(&esp_bus_config_, &i2c));
}
~I2C() = default;
//
// GETTERS
/**
* ESP I2C master bus handle getter.
* This will fail if an I2C instance was never constructed.
*/
static i2c_master_bus_handle_t get()
{
i2c_master_bus_handle_t i2c = nullptr;
ESP_ERROR_CHECK(i2c_master_get_bus_handle(0, &i2c));
return i2c;
}
//
// PUBLIC MEMBERS
/// ESP I2C master bus configuration used during initialization.
i2c_master_bus_config_t esp_bus_config_;
/// RST GPIO pin number.
int rst_num_;
private:
//
// PRIVATE MEMBERS
/// Tag used for ESP logging.
constexpr static const char *TAG = "I2C";
};
#endif //I2C_H

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## IDF Component Manager Manifest File
dependencies:
idf: '>=5.3.0'
espressif/arduino-esp32: ^3.1.1
lvgl/lvgl: "9.2.0"
esp_lcd_sh1107: "^1"

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#include "display.h"
#include "ssd1306.h"
// Pin may vary based on your schematic.
#define PIN_SDA GPIO_NUM_21
#define PIN_SCL GPIO_NUM_22
#define PIN_RST (-1)
I2C i2c(PIN_SDA, PIN_SCL, PIN_RST);
void setup()
{
SSD1306 ssd1306(i2c);
Display d(ssd1306);
d.set_text("Test test 12345678910",
"test-text1",
LV_LABEL_LONG_SCROLL,
LV_ALIGN_CENTER);
d.set_text("Test test changing text",
"test-text1",
LV_LABEL_LONG_SCROLL,
LV_ALIGN_CENTER);
d.set_text("Hello hello hello hello hello hello hello hello!", "test-text2");
d.set_text("A random sentence with no meaning at all.",
"test-text3",
LV_LABEL_LONG_CLIP,
LV_ALIGN_BOTTOM_MID);
}
void loop() { }

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef PANEL_H
#define PANEL_H
#include "panel_device.h"
/**
* Encapsulates esp_lcd_panel handles and operations.
* The only exception is esp_lcd_panel_io_i2c_config_t owned by IPanelDevice.
* This structure requires details specific to the implementing device.
*
* Panel is an implementation detail of Display, not meant to be used directly.
*/
struct Panel {
/**
* Construct a new Panel using an object that implements IPanelDevice.
*
* @param device An object that implements the IPanelDevice interface.
*/
explicit Panel(IPanelDevice &device) :
device_(&device),
esp_io_(nullptr),
esp_panel_(nullptr),
esp_panel_config_(
(esp_lcd_panel_dev_config_t) {
.reset_gpio_num = device_->rst_num_,
.bits_per_pixel = 1,
.vendor_config = device_->vendor_config(),
}
)
{
esp_io_ = device_->create_io_handle();
device_->create_panel(esp_panel_config_, esp_io_, esp_panel_);
ESP_LOGI(TAG, "Resetting panel display");
ESP_ERROR_CHECK(esp_lcd_panel_reset(esp_panel_));
ESP_LOGI(TAG, "Initializing panel display");
ESP_ERROR_CHECK(esp_lcd_panel_init(esp_panel_));
ESP_LOGI(TAG, "Turning on panel display");
ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(esp_panel_, true));
}
~Panel() = default;
//
// PUBLIC MEMBERS
/// Pointer to object using known interface for IPanelDevice.
IPanelDevice *device_;
/// ESP LCD panel IO handle.
esp_lcd_panel_io_handle_t esp_io_;
/// ESP LCD panel handle.
esp_lcd_panel_handle_t esp_panel_;
/// ESP LCD panel configuration structure.
esp_lcd_panel_dev_config_t esp_panel_config_;
/**
* Registers LVGL draw buffers and callbacks for rendering the display.
*
* @param display_handle Pointer to the LVGL display to use for rendering.
*/
inline void register_display_callbacks(lv_display_t *display_handle) const
{
device_->register_rendering_data(display_handle, esp_io_);
device_->register_lvgl_tick_timer();
}
private:
//
// PRIVATE MEMBERS
/// Tag used for ESP logging.
constexpr static const char *TAG = "Panel";
};
#endif //PANEL_H

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#include "panel_device.h"
#include "display.h"
bool IPanelDevice::lvgl_flush_ready_cb(esp_lcd_panel_io_handle_t,
esp_lcd_panel_io_event_data_t *,
void *user_ctx)
{
auto *disp = (lv_display_t *) user_ctx;
lv_display_flush_ready(disp);
return false;
}
void IPanelDevice::lvgl_flush_cb(lv_display_t *display, const lv_area_t *area,
uint8_t *px_map) // NOLINT(*-non-const-parameter)
{
auto panel_handle =
(esp_lcd_panel_handle_t) lv_display_get_user_data(display);
// Necessary because LVGL reserves 2x4 bytes in the buffer for a palette.
// Since we are monochrome, we don't need these additional bytes.
// For more information about the monochrome, please refer to:
// https://docs.lvgl.io/9.2/porting/display.html#monochrome-displays
// Skip the palette here.
px_map += LVGL_PALETTE_SIZE;
uint16_t hor_res = lv_display_get_physical_horizontal_resolution(display);
int32_t x1 = area->x1;
int32_t x2 = area->x2;
int32_t y1 = area->y1;
int32_t y2 = area->y2;
// As of 03/01/2025 master branch of LVGL contains this helper for the same.
// https://docs.lvgl.io/master/API/draw/sw/lv_draw_sw_utils.html
// lv_draw_sw_i1_convert_to_vtiled()
for (int32_t y = y1; y <= y2; y++) {
for (int32_t x = x1; x <= x2; x++) {
// Get the byte offset of the pixel coordinates using horizontal-mapping.
int h_offset = Pixel::horizontal_byte_offset(x, y, hor_res);
// True if the pixel is lit, else false.
bool chroma_color = px_map[h_offset] & Pixel::msb_mask(x);
// We need an additional buffer for transposing the pixel data to the
// vertical format required by the display driver.
uint8_t *buf = IPanelDevice::get_additional_draw_buffer();
// Move to the position in the auxillary buffer where the pixel is stored.
buf += Pixel::vertical_byte_offset(x, y, hor_res);
// Write the single bit to the monochrome display mapped vertically.
// Take the Least Significant Bit mask of the Y coordinate to select the
// bit representing a pixel at position y in a vertically-mapped display.
if (chroma_color) {
// Set the vertically-mapped pixel to on.
*buf &= ~Pixel::lsb_mask(y);
} else {
// Set the vertically-mapped pixel to off.
*buf |= Pixel::lsb_mask(y);
}
}
}
// Pass the draw buffer to the driver.
ESP_ERROR_CHECK(
esp_lcd_panel_draw_bitmap(panel_handle, x1, y1, x2 + 1, y2 + 1,
IPanelDevice::get_additional_draw_buffer()));
}
void IPanelDevice::lvgl_increase_tick_cb(void *)
{
// Tell LVGL how many milliseconds has elapsed
lv_tick_inc(LVGL_TICK_PERIOD_MS);
}
[[noreturn]] void IPanelDevice::lvgl_port_task(void *)
{
// Optionally initialize some LVGL objects here before entering loop below.
ESP_LOGI(TAG, "Starting LVGL task");
for (uint32_t time_to_next_ms = 0; true; usleep(1000 * time_to_next_ms)) {
// Obtain LVGL API lock before calling any LVGL methods.
ScopedLock lock;
// Optionally handle LVGL input or event logic here.
// Update LVGL periodic timers.
time_to_next_ms = lv_timer_handler();
}
}
void IPanelDevice::register_rendering_data(lv_display_t *display_handle,
esp_lcd_panel_io_handle_t io_handle)
{
// Create draw buffer.
ESP_LOGI(TAG, "Allocate separate LVGL draw buffers");
lv_buf_ = heap_caps_calloc(1, lv_buf_size_,
MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
assert(lv_buf_);
ESP_LOGI(TAG, "Set LVGL draw buffers");
// Color format must be set first, LVGL9 suooprt new monochromatic format.
lv_display_set_color_format(display_handle, LV_COLOR_FORMAT_I1);
lv_display_set_buffers(display_handle, lv_buf_, nullptr,
lv_buf_size_,
LV_DISPLAY_RENDER_MODE_FULL);
lv_display_set_rotation(display_handle, LV_DISPLAY_ROTATION_0);
ESP_LOGI(TAG, "Set LVGL callback for flushing to the display");
lv_display_set_flush_cb(display_handle, IPanelDevice::lvgl_flush_cb);
ESP_LOGI(TAG, "Register io panel callback for LVGL flush ready notification");
const esp_lcd_panel_io_callbacks_t cbs = {
.on_color_trans_done = IPanelDevice::lvgl_flush_ready_cb,
};
ESP_ERROR_CHECK(
esp_lcd_panel_io_register_event_callbacks(io_handle, &cbs,
display_handle));
}
void IPanelDevice::register_lvgl_tick_timer()
{
ESP_LOGI(TAG, "Use esp_timer to increase LVGL tick");
const esp_timer_create_args_t esp_timer_args = {
.callback = &IPanelDevice::lvgl_increase_tick_cb,
// Data to pass to the IPanelDevice::lvgl_port_task callback.
.arg = nullptr,
.name = "lvgl_tick",
};
Display::timers_.start_new_timer_periodic(esp_timer_args,
LVGL_TICK_PERIOD_MS * 1000);
// LVGL requires a FreeRTOS task for running it's event loop.
// The lvgl_port_task callback can update the UI or handle input logic.
// For this basic example we don't do either of these things.
ESP_LOGI(TAG, "Create LVGL FreeRTOS task");
// Optionally set user data to pass to LVGL's FreeRTOS task callback here.
void *user_data = nullptr;
xTaskCreate(lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE,
user_data, LVGL_TASK_PRIORITY, nullptr);
}

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef PANEL_DEVICE_H
#define PANEL_DEVICE_H
#include <esp_lcd_panel_dev.h>
#include <esp_lcd_panel_ops.h>
#include <esp_lcd_panel_io.h>
#include <esp_log.h>
#include <display/lv_display.h>
#include "i2c.h"
// LVGL reserves 2x4 bytes in the buffer to be used as a palette.
// This additional space must be added to the IPanelDevice::buf_size_.
#define LVGL_PALETTE_SIZE 8
#define LVGL_TICK_PERIOD_MS 5
#define LVGL_TASK_STACK_SIZE (4 * 1024)
#define LVGL_TASK_PRIORITY 2
#define LCD_H_RES 128
#define LCD_V_RES 64
/**
* Wraps some foundational operations performed on pixel coordinates when
* dealing with pointer arithmetic. Most of these could be done ad-hoc as needed
* but using this helper reduces the risk of errors.
*/
struct Pixel {
/**
* Calculate byte offset for the pixel at [x,y] within a horizontally-mapped
* monochrome uint8 draw buffer, using the initialized horizontal resolution.
*
* We use `>> 3` because each pixel requires 1 bit, but each uint8 in the draw
* buffer can hold 8 bits. To find the uint8 value in our draw buffer that
* stores this pixel's value we must compensate for this when using pixel
* coordinates in byte math.
*
* Therefore, each uint8 in the draw buffer stores the state of 8 pixels.
* Below is an example of calculating for [x, y] pixel coordinates [20, 10].
*
* For the horizontal case, each row (y_) of the image is represented by
* `hor_res_ >> 3` bytes (16). The byte-offset of the first pixel in the 10th
* row for example is `16 * 10` = 160.
*
* Since the pixels are stored horizontally we must calculate the 20th pixel
* column (x_) as `160 + (20 >> 3)`, or `160 + (20 / 8)` to get a final offset
* of 162.
*
* @param x X pixel coordinate to find byte offset.
* @param y Y pixel coordinate to find byte offset.
* @return byte offset for a single-byte monochrome pixel at [x,y].
*/
[[maybe_unused]] [[nodiscard]] static ptrdiff_t
horizontal_byte_offset(const int32_t &x, const int32_t &y, const int32_t& hor_res)
{
// Convert pixel (bit) coordinates to byte coordinates in the draw buffer.
return (hor_res >> 3) * y + (x >> 3);
}
/**
* Calculate byte offset for the pixel at [x,y] within a vertically-mapped
* monochrome uint8 draw buffer, using the initialized horizontal resolution.
*
* We use `>> 3` because each pixel requires 1 bit, but each uint8 in the draw
* buffer can hold 8 bits. To find the uint8 value in our draw buffer that
* stores this pixel's value we must compensate for this when using pixel
* coordinates in byte math.
*
* Therefore, each uint8 in the draw buffer stores the state of 8 pixels.
* Below is an example of calculating for [x, y] pixel coordinates [20, 10].
*
* For the vertical case, each row (y_) of the image is represented by
* `hor_res_` bytes (128) - one for each column (x_). Because the pixels are
* stored vertically, the byte-offset of the first pixel in the 10th row is
* `128 * (10 >> 3)` or * `128 * (10 / 8)` = 128.
*
* From this location we can simply calculate the 20th pixel column (x_) as
* `128 + 20` to get a final offset of 148, because the pixels are stored in a
* columnar format.
*
* @param x X pixel coordinate to find byte offset.
* @param y Y pixel coordinate to find byte offset.
* @return byte offset for a single-byte monochrome pixel at [x,y].
*/
[[maybe_unused]] [[nodiscard]] static ptrdiff_t
vertical_byte_offset(const int32_t &x, const int32_t &y, const int32_t& hor_res)
{
// Convert pixel (bit) coordinates to byte coordinates in the draw buffer.
return hor_res * (y >> 3) + x;
}
/**
* Finds the Most Significant Bit location of bit `i` in a byte.
*
* MSB LSB
* bits 7 6 5 4 3 2 1 0
* data 8 7 6 5 4 3 2 1
* Left Right
*
* @return bitmask for MSB location of `i`.
*/
[[maybe_unused]] [[nodiscard]] static uint8_t
msb_mask(const int32_t &i) { return 1 << (7 - i % 8); }
/**
* Finds the Least Significant Bit location of bit `i` in a byte.
*
* LSB MSB
* bits 0 1 2 3 4 5 6 7
* data 1 2 3 4 5 6 7 8
* Left Right
*
* @return bitmask for LSB location of `i`.
*/
[[maybe_unused]] [[nodiscard]] static uint8_t
lsb_mask(const int32_t &i) { return 1 << (i % 8); }
};
/**
* Encapsulates vendor specific ESP LCD panel initialization logic.
* This pure virtual interface can be inherited from for using new LCD devices.
* See SSD1306 as an example to implement IPanelDevice for NT35510 or ST7789.
*
* At this time only I2C is supported.
* Classes that inherit from this interface should likely be marked final.
*/
class IPanelDevice {
public:
/**
* Construct an IPanelDevice.
*
* @param i2c I2C object. Eventually this will mature to IProtocol or similar.
* @param config I2C configuration for this device.
* @param height Height of the device screen in pixels.
* @param width Width of the device screen in pixels.
*/
explicit IPanelDevice(I2C &i2c,
esp_lcd_panel_io_i2c_config_t config,
int width,
int height) :
IPanelDevice(i2c, config, width, height,
width * height / 8 + LVGL_PALETTE_SIZE) { }
/**
* Construct an IPanelDevice.
*
* @param i2c I2C object. Eventually this will mature to IProtocol or similar.
* @param config I2C configuration for this device.
* @param height Height of the device screen in pixels.
* @param width Width of the device screen in pixels.
* @param draw_buf_size Size of the draw buffer for this device.
*/
explicit IPanelDevice(I2C &i2c,
esp_lcd_panel_io_i2c_config_t io_config,
int width,
int height,
size_t draw_buf_size) :
width_(width),
height_(height),
rst_num_(i2c.rst_num_),
lv_buf_size_(draw_buf_size),
esp_io_config_(io_config) { }
virtual ~IPanelDevice() = default;
//
// PUBLIC METHODS
/**
* Create an LVGL display using the width and height of this device.
*
* @return Handle to the created LVGL display.
*/
[[nodiscard]] lv_display_t *create_display() const
{
auto display = lv_display_create(width_, height_);
assert(display);
return display;
}
/**
* Create an ESP LCD panel IO handle.
*
* @return The created ESP LCD panel IO handle.
*/
[[nodiscard]] esp_lcd_panel_io_handle_t create_io_handle()
{
ESP_LOGI(TAG, "Creating panel IO handle");
esp_lcd_panel_io_handle_t handle = nullptr;
ESP_ERROR_CHECK(
esp_lcd_new_panel_io_i2c(I2C::get(), &esp_io_config_, &handle));
return handle;
}
/**
* Create and initialize an ESP panel handle.
* IPanelDevice implementors must initialize the panel within init_panel.
*
* @param config ESP LCD panel configuration.
* @param io ESP LCD panel IO handle.
* @param [out] panel ESP LCD panel handle output pointer location.
*/
void create_panel(esp_lcd_panel_dev_config_t &config,
esp_lcd_panel_io_handle_t io,
esp_lcd_panel_handle_t &panel)
{
// If the passed handle is already allocated, delete it.
if (panel != nullptr) {
ESP_LOGI(TAG, "Removing unused panel");
esp_lcd_panel_del(panel);
}
ESP_LOGI(TAG, "Installing vendor panel driver");
// Call pure virtual method responsible for initializing the panel handle.
init_panel(config, io, panel);
}
/**
* Retrieve the device specific vendor configuration structure.
*
* @return Address of vendor configuration structure.
* @sa SSD1306::vendor_config
*/
virtual void *vendor_config() = 0;
//
// PUBLIC MEMBERS
/// Width of the device screen in pixels.
int32_t width_;
/// Height of the device screen in pixels.
int32_t height_;
/// RST GPIO pin number.
int rst_num_;
/// LVGL draw buffer size for the device.
size_t lv_buf_size_;
/// ESP LCD panel IO configuration.
esp_lcd_panel_io_i2c_config_t esp_io_config_;
/**
* Registers LVGL draw buffers and callbacks for this display.
*
* An implementation of the interface can optionally override this method to
* provide custom LVGL callbacks and display configurations.
*
* @param display_handle LVGL display handle to use for rendering.
* @param io_handle IO handle for the ESP LCD panel.
*/
virtual void register_rendering_data(lv_display_t *display_handle,
esp_lcd_panel_io_handle_t io_handle);
/**
* Registers LVGL ticker timer callback for rendering this display.
*
* An implementation of the interface can optionally override this method to
* provide custom LVGL callbacks and tick configurations.
*/
virtual void register_lvgl_tick_timer();
protected:
/**
* Static accessor to a static buffer to store draw buffer data for the panel.
*
* This method is protected to allow an implementation to provide a custom
* callback method similar to IPanelDevice::lvgl_flush_cb.
*
* The buffer is allocated statically within the scope of this function to
* allow creating multiple panels that _each_ manage their own statically
* allocated draw buffer data. This simplifies implementing the interface by
* taking this responsibility off of the implementor. The buffer will only be
* allocated if this method is called, so the memory is only used if required.
*
* @return Pointer to uint8 draw buffer data.
* @sa register_rendering_data for overriding LVGL rendering callbacks.
*/
static uint8_t *get_additional_draw_buffer()
{
// Static to the scope of this function, not the compilation unit.
// For LV_COLOR_FORMAT_I1 we need an extra buffer to hold converted data.
static uint8_t oled_buffer[LCD_H_RES * LCD_V_RES / 8];
return oled_buffer;
}
private:
//
// PRIVATE METHODS
/**
* Initializes the ESP panel using vendor specific APIs and configurations.
* This method should implement any setup logic specific to the device.
*
* @param config ESP LCD panel configuration.
* @param io ESP LCD panel IO handle.
* @param [out] panel ESP LCD panel handle output pointer location.
*/
virtual void init_panel(esp_lcd_panel_dev_config_t &config,
esp_lcd_panel_io_handle_t io,
esp_lcd_panel_handle_t &panel) = 0;
//
// PRIVATE STATIC METHODS
/**
* The callback invoked when panel IO finishes transferring color data.
* This signals that the panel is ready to flush image data to the display.
*
* @param panel LCD panel IO handles.
* @param data Panel IO event data, fed by driver.
* @param user_ctx User data, passed from `esp_lcd_panel_io_xxx_config_t`.
* @return Whether a high priority task has been waken up by this function.
* @sa SSD1306::SSD1306 for setting user_ctx data passed to the callback.
* @sa register_rendering_data for overriding this callback.
*/
static bool lvgl_flush_ready_cb(esp_lcd_panel_io_handle_t panel,
esp_lcd_panel_io_event_data_t *data,
void *user_ctx);
/**
* The callback invoked for flushing the rendered image to the display.
*
* `px_map` contains the rendered image as raw pixel map and it should be
* copied to `area` on the display.
*
* The following details are crucial for understanding the logic surrounding
* flushing to the display in this example.
*
* The order of bits within the px_map from _LVGL_ is MSB first.
* MSB LSB
* bits 7 6 5 4 3 2 1 0
* pixels 0 1 2 3 4 5 6 7
* Left Right
*
* The bytes from _LVGL_ are mapped to pixel rows of the display
* 8 bits (pixels) per byte -
* [0, 0, 0, 0, 0, 0, 0, 0]
* [0, 0, 0, 0, 0, 0, 0, 0]
* [0, 0, 0, 0, 0, 0, 0, 0]
*
* The order of bits expected by the _display driver_ is LSB first.
* We must preserve pairing of each bit and pixel when writing to the display.
* LSB MSB
* bits 0 1 2 3 4 5 6 7
* pixels 7 6 5 4 3 2 1 0
* Left Right
*
* Bytes expected by the _display driver_ map to pixel columns of the display.
* 8 bits (pixels) per byte -
* [0, [0, [0, [0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0] 0] 0] 0]
*
* These layouts in memory have no opinion on the shape of the image. The
* beginning and end of a row or a column for example is entirely dependent
* on how the data is accessed. The vertical and horitzontal resolution may
* vary between displays.
*
* For the LV_COLOR_FORMAT_I1 color format we are using, an additional buffer
* is needed for transposing the bits to the vertical arrangement required by
* the display driver that is outlined above.
*
* This callback implementation is an example of handling this transposition
* and flushing the data to the display in the expected format.
*
* @param display LVGL display handle to use for rendering.
* @param area Area of the display being flushed.
* @param px_map Rendered image data for writing to the display area.
* @sa register_rendering_data for overriding this callback.
* @sa get_additional_draw_buffer
*/
static void lvgl_flush_cb(lv_display_t *display,
const lv_area_t *area,
uint8_t *px_map);
/**
* Callback invoked for every period of the timer.
*
* This callback _must_ call lv_tick_inc to inform LVGL how much time has
* elapsed since the last period of the timer.
*
* @param data User data passed to the callback.
* @sa register_lvgl_tick_timer for setting user data and the tick period of
* the timer, or overriding this callback entirely.
*/
static void lvgl_increase_tick_cb(void *data);
/**
* FreeRTOS task callback invoked for handling LVGL events or updating the UI.
*
* This function is intentionally an endless loop and should never return.
* LVGL initialization logic can optionally be added before entering the loop.
* Input logic can optionally be handled within the loop.
*
* This callback _must_ call lv_timer_handler to handle LVGL periodic timers.
*
* @param data User data passed to the callback.
* @sa register_lvgl_tick_timer for overriding this callback.
*/
[[noreturn]] static void lvgl_port_task(void *data);
//
// PRIVATE MEMBERS
/// LVGL draw buffer associated with this Display's lv_display_t.
void *lv_buf_;
/// Tag used for ESP logging.
constexpr static const char *TAG = "IPanelDevice";
};
#endif // PANEL_DEVICE_H

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#include "scoped_lock.h"
// LVGL library is not thread-safe, this example calls LVGL APIs from tasks.
// We must use a mutex to protect it.
_lock_t ScopedLock::lv_lock_;

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef SCOPED_LOCK_H
#define SCOPED_LOCK_H
#include <mutex>
/**
* Obtains LVGL API mutex lock for the duration of local scope.
*
* LVGL library is not thread-safe, this lock should be held when making calls
* to the LVGL API, and released as soon as possible when finished.
*/
struct ScopedLock {
explicit ScopedLock() { _lock_acquire(&lv_lock_); }
~ScopedLock() { _lock_release(&lv_lock_); }
/// Mutex used to protect LVGL API calls.
static _lock_t lv_lock_;
};
#endif // SCOPED_LOCK_H

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef SSD1306_H
#define SSD1306_H
#include <esp_lcd_panel_ssd1306.h>
#include "panel_device.h"
// According to specific display hardware.
// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
#define SCREEN_WIDTH 128 // OLED display width, in pixels.
#define SCREEN_HEIGHT 64 // OLED display height, in pixels.
// According to SSD1306 datasheet.
// https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
#define I2C_HW_ADDR 0x3C
#define LCD_PIXEL_CLOCK_HZ (400 * 1000)
// Bit number used to represent command and parameter
#define LCD_CMD_BITS 8
#define LCD_PARAM_BITS 8
/**
* Example of implementing the IPanelDevice interface for SSD1306 LCD device.
*/
class SSD1306 final : public IPanelDevice {
public:
/**
* Construct a new SSD1306 device.
*
* @param i2c I2C master bus to manage this device.
*/
explicit SSD1306(I2C &i2c) :
SSD1306(i2c, {.height = SCREEN_HEIGHT}) { }
/**
* Construct a new SSD1306 device given a specific SSD1306 configuration.
*
* @param i2c I2C master bus to manage this device.
* @param config SSD1306 vendor configuration.
* @param width Width of the device screen in pixels.
* @param height Height of the device screen in pixels.
*/
SSD1306(I2C &i2c,
esp_lcd_panel_ssd1306_config_t config,
int width = SCREEN_WIDTH,
int height = SCREEN_HEIGHT
) :
IPanelDevice(i2c,
(esp_lcd_panel_io_i2c_config_t) {
.dev_addr = I2C_HW_ADDR,
// User data to pass to the LVGL flush_ready callback.
// See IPanelDevice::lvgl_flush_ready_cb
.user_ctx = nullptr,
.control_phase_bytes = 1,
.dc_bit_offset = 6,
.lcd_cmd_bits = LCD_CMD_BITS,
.lcd_param_bits = LCD_PARAM_BITS,
.scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
},
width,
height
),
ssd1306_config_(config) { }
~SSD1306() final = default;
//
// PUBLIC METHODS
/**
* Provides the SSD1306 vendor configuration to IPanelDevice consumers.
*
* @return Address of the SSD1306 vendor configuration structure.
*/
void *vendor_config() override
{
return &ssd1306_config_;
}
//
// PUBLIC MEMBERS
/// SSD1306 configuration structure.
esp_lcd_panel_ssd1306_config_t ssd1306_config_;
private:
//
// PRIVATE METHODS
/// Initializes the ESP LCD panel handle for the SSD1306 device.
void init_panel(esp_lcd_panel_dev_config_t &config,
esp_lcd_panel_io_handle_t io,
esp_lcd_panel_handle_t &panel) override
{
ESP_ERROR_CHECK(esp_lcd_new_panel_ssd1306(io, &config, &panel));
}
};
#endif // SSD1306_H

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/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef TIME_KEEPER_H
#define TIME_KEEPER_H
#include <esp_log.h>
#include <esp_timer.h>
#include "i2c.h"
/**
* Stores arguments and ESP timer handle for a Timer.
* In general Timers should be used via the TimeKeeper interface only.
*
* Timers cannot be copied, and are only created by a TimeKeeper instance.
* The TimeKeeper can delete existing Timers, calling it's destructor.
* The ESP timer will be deleted when this class desctructor is called.
*/
struct Timer {
explicit Timer(esp_timer_create_args_t args) :
args_(args), esp_timer_(nullptr)
{
ESP_LOGI(TAG, "Creating esp_timer with name: '%s'", args_.name);
ESP_ERROR_CHECK(esp_timer_create(&args, &esp_timer_));
}
~Timer()
{
ESP_LOGI(TAG, "Destroying esp_timer with name: '%s'", args_.name);
ESP_ERROR_CHECK(esp_timer_delete(esp_timer_));
}
Timer(const Timer &) = delete;
Timer(Timer &) = delete;
Timer &operator=(Timer &) = delete;
//
// PUBLIC MEMBERS
/// Arguments passed to ESP API during timer creation.
esp_timer_create_args_t args_;
/// ESP timer handle.
esp_timer_handle_t esp_timer_;
private:
//
// PRIVATE MEMBERS
/// Tag used for ESP logging.
constexpr static const char *TAG = "Timer";
};
/**
* ESP timer mananger class.
*
* Timers should only be accessed using the get_handle method.
* If the Timer destructor is called the underlying ESP timer will be deleted.
*/
struct TimeKeeper {
/// Timer handle type used for referring to Timers.
using TimerHandle = Timer *;
//
// GETTERS
TimerHandle get_handle(const char *name)
{
return &managed_timers_.at(name);
}
TimerHandle operator[](const char *name) { return get_handle(name); }
//
// PUBLIC METHODS
/**
* Create a new managed Timer with the provided ESP arguments.
* The timer can be retrieved later using the args.name field value.
*
* @param args ESP timer creation arguments.
* @return TimerHandle Handle to a Timer managed by this TimeKeeper.
* @sa get_handle
* @sa operator[](const char*)
*/
[[maybe_unused]] TimerHandle create_timer(esp_timer_create_args_t args)
{
auto rt = managed_timers_.emplace(args.name, args);
if (!rt.second) {
ESP_LOGE(TAG, "Timer already exists with name '%s'", args.name);
return nullptr;
}
return &rt.first->second;
}
/// Stop a Timer with the given name.
[[maybe_unused]] void stop_timer(const char *name)
{
ESP_ERROR_CHECK(esp_timer_stop(get_handle(name)->esp_timer_));
}
/// Delete a Timer with the given name.
[[maybe_unused]] void delete_timer(const char *name)
{
if (managed_timers_.erase(name) == 0) {
ESP_LOGE(TAG, "Attempt to delete timer that does not exist: '%s'", name);
}
}
/// Create a Timer with the ESP args and call esp_timer_start_periodic.
[[maybe_unused]] void
start_new_timer_periodic(esp_timer_create_args_t args,
uint64_t period)
{
start_timer_periodic(create_timer(args)->args_.name, period);
}
/// Calls esp_timer_start_periodic on the Timer with the given name.
[[maybe_unused]] void start_timer_periodic(const char *name,
uint64_t period)
{
ESP_ERROR_CHECK(
esp_timer_start_periodic(get_handle(name)->esp_timer_, period));
}
/// Create a Timer with the ESP args and call esp_timer_start_once.
[[maybe_unused]] void start_new_timer_once(esp_timer_create_args_t args,
uint64_t timeout_us)
{
start_timer_once(create_timer(args)->args_.name, timeout_us);
}
/// Calls esp_timer_start_once on the Timer with the given name.
[[maybe_unused]] void start_timer_once(const char *name,
uint64_t timeout_us)
{
ESP_ERROR_CHECK(
esp_timer_start_once(get_handle(name)->esp_timer_, timeout_us));
}
private:
//
// PRIVATE MEMBERS
/// Existing ESP timers created for this TimeKeeper instance.
std::unordered_map<const char *, Timer> managed_timers_;
/// Tag used for ESP logging.
constexpr static const char *TAG = "TimeKeeper";
};
#endif // TIME_KEEPER_H

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# esp
```bash
shaunrd0/klips/esp/
├── 01_led-button # Simple LED circuit controlled by an on board button.
├── 02_led-button-web # LED controlled by a button or within a web browser.
├── 03_temp-humidity-web # Temperature and humidity sensor within a web browser.
├── 04_esp-idf-arduino # CMake example instead of Arduino IDE for ESP development.
├── 05_temp-humidity-web # Temperature and humidity sensor within a web browser.
├── 06_i2c-scanner # Simple I2C device scanner.
├── 07_lcd-panel-i2c # Drawing to a LCD display with LVGL over I2C.
├── ESP32-basic-starter-kit.pdf # PDF for tutorials in ESP32 starter kit.
├── ESP32-dev-module.png
└── README.md
```
Examples 1-3 are built using the Arduino IDE.
All examples after `04_esp-idf-arduino` are built with cmake and the [ESP-IDF](https://github.com/espressif/esp-idf).
[Arduino ESP32 GitHub](https://github.com/espressif/arduino-esp32) \
[Arduino ESP32 API reference](https://docs.espressif.com/projects/arduino-esp32/en/latest/libraries.html)

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# javascript
# Javascript
This directory contains Javascript projects and examples that I've made.
```bash
shaunrd0/klips/javascript
```
github.com/shaunrd0/klips/javascript
├── webgl # Examples of using WebGL within JS
└── README.md
```

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# python
This directory contains a collection of Python scripts or CLI tools that I've made.
Each of these projects provide a `requirements.txt` that can be used to