let port2, reader2, writer2;

​

async function setup() {

  createCanvas(400, 400);

​

  // Set up first serial port

  ({ port: port1, reader: reader1, writer: writer1 } = await getPort());

​

  // Set up second serial port

  ({ port: port2, reader: reader2, writer: writer2 } = await getPort());

​

  // Start reading from the serial ports

  runSerial();

}

​

async function runSerial() {

  try {

    while (true) {

      // Read from the first serial port

      const { value: value1, done: done1 } = await reader1.read();

      if (!done1) {

        console.log("Received from port 1:", value1);

        // Write to the second serial port

        await writer2.write(value1);

      }

​

      // Read from the second serial port

      const { value: value2, done: done2 } = await reader2.read();

      if (!done2) {

        console.log("Received from port 2:", value2);

        // Write to the first serial port

        await writer1.write(value2);

      }

    }

  } catch (e) {

    console.error(e);

  }

}

​

function draw() {

  background(220);

  textSize(20);

  text("Open the browser console to see serial output.", 20, height / 2);

}

​

function keyPressed() {

  // Write to the first serial port when 'a' key is pressed

  if (key === "a") {

    writeSerial1("Hello from port 1!\n");

  }

  // Write to the second serial port when 'b' key is pressed

  if (key === "b") {

    writeSerial2("Hello from port 2!\n");

  }

}

​

async function writeSerial1(msg) {

  await writer1.write(msg);

}

​

async function writeSerial2(msg) {

  await writer2.write(msg);

}

​