Tessel freezing when reading sensor data

[dtex]

If there is more than one Sensor instance, the Tessel 2 console output will freeze after a few seconds.

Tessel environment versions:

INFO t2-cli: 0.1.4
INFO t2-firmware: 0.0.16
INFO Node.js: 4.5.0

One sensor seems to work fine:

const five = require("johnny-five");
const tessel = require("tessel-io");

var board = new five.Board({ io: new tessel() });

board.on("ready", () => {
  var x = new five.Sensor({pin: "b2"})
  x.on("change", function() {
    console.log(x.value);
  }); 
});

But two sensors will freeze up after a few seconds:

const five = require("johnny-five");
const tessel = require("tessel-io");

var board = new five.Board({ io: new tessel() });

board.on("ready", () => {
  var x = new five.Sensor({pin: "b2"})
  var y = new five.Sensor({pin: "b4"})
  x.on("change", function() {
    console.log(x.value);
  }); 
});

Note that I'm not doing anything with that second sensor. The fact that it exists seems to matter.

Notes:

• The code on the Tessel keeps running. If I hook up an LED and control it with the sensor(s), it continues to respond to input events even after the freeze.

This code seems to work fine which is what leads me to believe the problem is in tessel-io:

var tessel = require('tessel');

var x = tessel.port.B.pin[2];
var y = tessel.port.B.pin[4];

const foo = function() {
  x.analogRead((error, xVal) => {
    y.analogRead((error, yVal) => {
      console.log(xVal, yVal);
    })  
  });
  setTimeout( function() { foo(); }, 10);
}

foo();

[dtex]

Updated

[rwaldron]

I can reproduce with:

"use strict";

const Tessel = require("../lib/");
const board = new Tessel();

board.on("ready", () => {
  const pins = ["A4","A7","B2","B4","B7"];
  const values = pins.reduce((accum, pin) => (accum[pin] = 0, accum), {});

  pins.forEach(p => {
    board.pinMode(p, board.MODES.ANALOG);
    board.analogRead(p, value => values[p] = value);
  });

  // 50Hz
  setInterval(() => {
    process.stdout.write(`\r ${Date.now()}: ${pins.map(p => padStart(values[p], 4, 0)).join("")}`);
  }, 1000 / 50);
});

function padStart(v, l, c) {
  v = String(v);
  return Array(l - v.length + 1).join(c || " ") + v;
}

[rwaldron]

I will have a branch for you to try later today

[rwaldron]

Here's an updated test program that I've been running:

"use strict";
const Tessel = require("../lib/");
const board = new Tessel();

board.on("ready", () => {

  console.log(`Started At: ${Date.now()}`);
  const pins = ["A4","A7","B2","B3","B4","B5","B6","B7"];
  const values = pins.reduce((accum, pin) => (accum[pin] = 0, accum), {});

  pins.forEach(p => {
    board.pinMode(p, board.MODES.ANALOG);
    board.analogRead(p, value => values[p] = value);
  });

  // 50Hz
  setInterval(() => {
    process.stdout.write(`\r ${Date.now()}: ${pins.map(p => padStart(values[p], 4, 0)).join("")}`);
  }, 1000 / 50);
});

function padStart(v, l, c) {
  v = String(v);
  return Array(l - v.length + 1).join(c || " ") + v;
}

This has been going steadily for over 10 minutes. I did a screen recording for about a minute of that, which shows me adjusting a potentiometer on A4: https://www.youtube.com/watch?v=3f_xcWk3DPg

[rwaldron]

I just stopped the program after it passed 20 minutes. I'm going to add some digital writing into the process and see what happens.

[rwaldron]

@dtex if you would...

npm install rwaldron/tessel-io#16

[rwaldron]

Here's the version that writes...

"use strict";

const Tessel = require("../lib/");
const board = new Tessel();

board.on("ready", () => {
  console.log(`Started At: ${Date.now()}`);
  const pins = ["A4","A7","B2","B3","B4","B5","B6","B7"];
  const values = pins.reduce((accum, pin) => (accum[pin] = 0, accum), {});

  pins.forEach(p => {
    board.pinMode(p, board.MODES.ANALOG);
    board.analogRead(p, value => values[p] = value);
  });

  const leds = ["L0", "L1", "L2", "L3"];
  let state = 1;

  leds.forEach(led => board.digitalWrite(led, state));

  // 50Hz
  setInterval(() => {
    process.stdout.write(`\r ${Date.now()}: ${pins.map(p => padStart(values[p], 4, 0)).join("")}`);
    state ^= 1;
    leds.forEach(led => board.digitalWrite(led, state));
  }, 1000 / 50);
});

function padStart(v, l, c) {
  v = String(v);
  return Array(l - v.length + 1).join(c || " ") + v;
}

[dtex]

I missed your request. Will test tonight.

[dtex]

Same result. No more freezing.

[rwaldron]

That's great! I will get this merged and released asap