Numworks.js

Utility classes to interract with a Numworks calculator using WebUSB.

Running the example

npm install
npm start

Getting started with Numworks.js

Numworks.js is simple and intuitive to use.

Connecting to the calculator

There are two ways to connect to the calculator, either by using WebUSB's auto-detect feature or by manual connection.

Auto detection

var calculator = new Numworks();

navigator.usb.addEventListener("disconnect", function(e) {
  calculator.onUnexpectedDisconnect(e, function() {
    // Do stuff when the calculator gets disconnected.
  });
});

calculator.autoConnect(function() {
  // Do stuff...
});

autoConnect will try to detect a NumWorks calculator once a second. You can use stopAutoConnect to make the loop stop.

Manual connection

var calculator = new Numworks();

navigator.usb.addEventListener("disconnect", function(e) {
  calculator.onUnexpectedDisconnect(e, function() {
    // Do stuff when the calculator gets disconnected.
  });
});

calculator.detect(function() {
  // Do stuff...
}, function(error) {
  // Handle errors.
});

This code should be called in an event handler, such as a click handler.

Combining both methods

Both methods can be combined, making life easier for the user.

var calculator = new Numworks();

navigator.usb.addEventListener("disconnect", function(e) {
  calculator.onUnexpectedDisconnect(e, function() {
    calculator.autoConnect(connectedHandler);

    // Do stuff when the calculator gets disconnected.
  });
});

calculator.autoConnect(connectedHandler);

calculator.autoConnect();

function someEventHandler(e) {
  calculator.detect(connectedHandler, function(error) {
    // Handle errors.
  });
}

function connectedHandler() {
  calculator.stopAutoConnect(); // It's connected, so autoConnect should stop.
  // Do stuff when the claculator gets connected.
}

Accessing data from the calculator.

Now that we are connected to the NumWorks calculator, we can do stuff with it (YAY!)

Determining the model

The function getModel can be used to determine the model of the connected calculator. It returns either 0100 or 0110.

Getting information about the software

getPlatformInfo can be used to get information about the software installed on the calculator. It returns an object, formatted as follows :

{
  // Whether or not the software is valid, based on a magic number. If false, the rest of the structure is absent.
  "magik": true,
  // Whether or not the software is considered as old (< Epsilon 11).
  // This is primarely used by the parser itself to know where to read data.
  "oldplatform": false,
  // This part of the data is related to the Omega fork of Epsilon.
  "omega": {
    // Whether or not Omega is installed on the Numworks. If false, the rest of the Omega structure is absent
    "installed": true
    // The version of Omega detected on the calculator.
    "version": "1.19.2",
    // Username written in the system. "" if none.
    "user": "M4x1m3"
  },
  // The version of Epsilon installed on the calculator.
  "version": "13.0.0",
  // The system's commit ID
  "commit": " 651abf9",
  "storage": {
    // Address of the script storage
    "address": 165467,
    // Size of the script storage
    "size": 65535
  }
}

Reading and writing to the script store

The script store can be read using backupStorage and can be written to using installStorage. Here is an example of adding a script in the storage

var storage = await calculator.backupStorage();
storage.records.push({"name": "test", "type":"py", "autoImport": true, "code": "print('Hello World!')\n"});
await calculator.installStorage(storage, function() {
  // Do stuff after writing to the storage is done
});

Flashing an update

The methods flashInternal and flashExternal can be used to flash an update. They write to the internal and the external flash, respectively. Not that the external flash is not available on a N0100.

Licensing

Numworks.js is released under the MIT license.

Numworks is a registered trademark of Numworks SAS, 24 Rue Godot de Mauroy, 75009 Paris, France. Numworks SAS isn't associated in any shape or form with this project.