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Does node.js not include packages in opkg yet?

  • Dan L.

    šŸ»šŸ»šŸ»

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  • Dan L.

    Have quickly re-implemented my Python GPIO helper in JavaScript, if anyone wants to give it a go? Wont be able to test for another 12 hours (supposed to be working!).

    EDIT: Code now here https://community.onion.io/topic/46/simple-node-js-wrapper-and-demo

    0 Theodore Borromeo 2 Replies
  • Theodore Borromeo

    @Dan-L. I would, but I got the micro dock and haven't had time to:
    1.) wire up the omega to a breadboard
    2.) breadboard -> micro dock so that I can get serial access
    3.) and wire up omega pin outs from breadboard to leds/buttons šŸ˜ž

    It's is probably why I've been tinkering around with just getting software to work šŸ˜‰

    I think I should probably guy the other docks, though I am awaiting the camera kit as I've been wanting to see if I can't create a forward facing camera for my car (rear facing cams are great, but I still can't tell where my hood is in relation to the other guy's bumper!) I test drove the new Tesla Model S, and their 360 sonar ranging was SWEET! Not to mention auto-pilot <digressing>

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  • Theodore Borromeo

    @Dan-L. Also, your use of 'this' is mangled for javascript. I'm trying to fix it now. You also meant to write:
    GPIOHelper.prototype.setPinDirection = function(pin, dir, callback) {
    if(dir !== 'out' && dir !== 'in') {
    throw new Error("Invalid pin direction, use 'in' or 'out'.");
    }
    fs.writeFile(this.pinDirectionPath.replace('$', pin), dir, callback);
    };

    GPIOHelper.prototype.setPinDirectionSync = function(pin, dir) {
    if(dir !== 'out' && dir !== 'in') {
    throw new Error("Invalid pin direction, use 'in' or 'out'.");
    }
    fs.writeFileSync(this.pinDirectionPath.replace('$', pin), dir);
    };

    I'll have to ensure that:
    fs.writeFileSync(this.pinValuePath.replace('$', pin), String(value));

    resolves to the this.pinValuePath you've defined in the GPIOHelper function. ES7, with proper class support, will hopefully make this moot šŸ˜› As of right now I get the error:

    /mnt/sda1/scripts/js/gpiotest/GPIOHelper.js:53
    fs.writeFileSync(this.pinDirectionPath.replace('$', pin), dir);
    ^
    TypeError: Cannot call method 'replace' of undefined

    0 Theodore Borromeo 1 Reply
  • Theodore Borromeo

    @Theodore-Borromeo Correction to last post:
    'this' usage is fine, but we can't 'see' :
    this.pinDirectionPath
    this.pinValuePath

    from outside the function definition. I've tried returning them at the end of the GPIOHelper() function, though that is still returning undefined. I think this wrapper may need a little bit of work, and I'm tinkering away with it now. However, I am only moderately skilled at javascript. . .

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  • Theodore Borromeo

    Uggh. Here's where I'm stuck.

    -- GPIOHelper.js --

    var fs = require('fs');

function GPIOHelper() {

this.exportPath = "/sys/class/gpio/gpiochip0/subsystem/export";
this.pinDirectionPath = "/sys/class/gpio/gpio$/direction";
this.pinValuePath = "/sys/class/gpio/gpio$/value";
this.pins = [0, 1, 6, 7, 8, 12, 13, 14, 23, 26, 21, 20, 19, 18];

for(var x = 0; x < this.pins.length; x++) {
    fs.writeFileSync(this.exportPath, String(this.pins[x]));
}

}

GPIOHelper.prototype.setPinDirection = function(pin, dir, callback) {
    if(dir !== 'out' && dir !== 'in') {
        throw new Error("Invalid pin direction, use 'in' or 'out'.");
    }
    fs.writeFile(this.pinDirectionPath.replace('$', pin), dir, callback);
};

GPIOHelper.prototype.setPin = function(pin, value, callback) {
    var newPinValuePath = this.pinValuePath.replace('$',pin);
    this.setPinDirection(pin, 'out', function(err) {
        if(err) {
            callback(err);
        } else {
            fs.writeFile(newPinValuePath, String(value), callback);
        }
    });
};

GPIOHelper.prototype.getPin = function(pin, callback) {
    var newPinValuePath = this.pinValuePath.replace('$',pin);
    this.setPinDirection(pin, 'in', function(err) {
        if(err) {
            callback(err);
        } else {
            fs.readFile(newPinValuePath, function(err, buf) {
                if(err) {
                    callback(err);
                } else {
                    callback(null, parseInt(buf.toString()));
                }
            });
        }
    });
};

GPIOHelper.prototype.setPinDirectionSync = function(pin, dir) {
    var newPinDirectionPath = this.pinDirectionPath.replace('$',pin);
    if(dir !== 'out' && dir !== 'in') {
        throw new Error("Invalid pin direction, use 'in' or 'out'.");
    }
    fs.writeFileSync(newPinDirectionPath, dir);
};
GPIOHelper.prototype.setPinSync = function(pin, value) {
    var newPinValuePath = this.pinValuePath.replace('$',pin);
    this.setPinDirectionSync(pin, 'out');
    fs.writeFileSync(newPinValuePath, String(value));
};

GPIOHelper.prototype.getPinSync = function(pin) {
    var newPinValuePath = this.pinValuePath.replace('$',pin);
    this.setPinDirectionSync(pin, 'in');
    var val = fs.readFileSync(this.pinValuePath.replace('$', pin));
    return parseInt(buf.toString());
};

module.exports = GPIOHelper;

    -- gpiotest.js --

    var gpiohelper = require('./GPIOHelper'),
    ledPins = [0],
    buttonPin = 26;

var Controller = gpiohelper();

function turnOn(){
    for (pin in ledPins){
            Controller.setPinSync(pin,1);
            print("Turning on pin {0}".format(pin));
    }
}

function turnOff(){
    for (pin in ledPins){
            Controller.setPinSync(pin,0);
            print("Turning off pin {0}".format(pin));
    }
}

do {
    setTimeout(turnOn,250);
    setTimeout(turnOff,250);
} while (1)

    -- log output --

    /mnt/sda1/scripts/js/gpiotest# /mnt/sda1/out/Release/node gpiotest.js

fs.js:528
  return binding.write(fd, buffer, offset, length, position);
             ^
Error: EBUSY, resource busy or locked
at Object.fs.writeSync (fs.js:528:18)
at Object.fs.writeFileSync (fs.js:975:21)
at GPIOHelper (/mnt/sda1/scripts/js/gpiotest/GPIOHelper.js:11:12)
at Object.<anonymous> (/mnt/sda1/scripts/js/gpiotest/gpiotest.js:5:18)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)

    šŸ˜ž

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  • Dan L.

    Hmm, looking into this now, I just woke up. I'm getting the same error, but also note you need to call var Controller = new gpiohelper(); ā€” the new keyword creates an object with the methods. Otherwise, the constructor function runs but you wont get an object out of it.

    0 Theodore Borromeo 1 Reply
  • Theodore Borromeo

    @Dan-L. updated code:

    var gpiohelper = require('./GPIOHelper'),
    ledPins = [0],
    buttonPin = 26;

var Controller = new gpiohelper();

function turnOn(){
    for (pin in ledPins){
            Controller.setPinSync(pin,1);
            print("Turning on pin {0}".format(pin));
    }
}

function turnOff(){
    for (pin in ledPins){
            Controller.setPinSync(pin,0);
            print("Turning off pin {0}".format(pin));
    }
}

do {
     var p1 = new Promise(
         function(resolve,reject){
             setTimeout(turnOn,1000);
         });
    p1.then(
        setTimeout(turnOff,1000)
    )
    .catch(
        function(reason) {
            console.log(reason + ' rejected');
        });
} while(1);

    Still no dice, and same error.

    0
  • Dan L.

    Turns out the export errors are kinda OK? Still works without em (if you try/catch). It's not working from the command line either.

    There were also a bunch of other bugs, like the wrong variable name as you found above, and if you called .setPin(5, true) it would send "true" rather than "1".

    Try the new code, then check the "/sys/class/gpio/" folder ā€” do you see a bunch of gpioX folders?

    EDIT: Code now here https://community.onion.io/topic/46/simple-node-js-wrapper-and-demo

    0 Theodore Borromeo 1 Reply
  • Theodore Borromeo

    @Dan-L. SO with this code in test.js:

    // test.js
var GPIOHelper = require('./gpiohelper');

var helper = new GPIOHelper();

// Get pin value synchronously
console.log("Sync value was "+helper.getPinSync(1));

// Set some pins synchronously
helper.setPinSync(0, true);

// Get pin async
helper.getPin(0, function(err, val) {
    if(err) {
        console.log("Couldn't set pin?", err);
    } else {
        console.log("Value is", val);
    }
});

// Set pin async
helper.setPin(0, true, function(err) {
    if(err) {
        console.log("Couldn't set pin?", err);
    }
});

helper.setPinSync(0,false);
console.log("Sync value was "+helper.getPinSync(0));

    I get:

    /mnt/sda1/out/Release/node test.js
Ignoring pin 0 export error Error: EBUSY, resource busy or locked
Ignoring pin 1 export error Error: EBUSY, resource busy or locked
Ignoring pin 6 export error Error: EBUSY, resource busy or locked
Ignoring pin 7 export error Error: EBUSY, resource busy or locked
Ignoring pin 8 export error Error: EBUSY, resource busy or locked
Ignoring pin 12 export error Error: EBUSY, resource busy or locked
Ignoring pin 13 export error Error: EBUSY, resource busy or locked
Ignoring pin 14 export error Error: EBUSY, resource busy or locked
Ignoring pin 23 export error Error: EBUSY, resource busy or locked
Ignoring pin 26 export error Error: EBUSY, resource busy or locked
Ignoring pin 21 export error Error: EBUSY, resource busy or locked
Ignoring pin 20 export error Error: EBUSY, resource busy or locked
Ignoring pin 19 export error Error: EBUSY, resource busy or locked
Ignoring pin 18 export error Error: EBUSY, resource busy or locked
Sync value was 1
Sync value was 0
Value is 1

    So with some static typing, I perhaps could have realized I should have been using 'true' and 'false' instead of int values šŸ˜ž Though I don't even think that it would have mattered. I'm modifying code now to get a simple blink example off of pin 0.

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  • Dan L.

    @Theodore-Borromeo Ahh, well 1 or 0 would have worked with the previous code ā€” but I updated it so any "truthy" value will be sent as "1".

    Next step is adding some event listening, which should really get things moving. It'll be hacky though and have to use polling! Will try and implement tonight though šŸ™‚

    1 Theodore Borromeo 1 Reply
  • Theodore Borromeo

    It seems that depending on javascript to take care of file handle closing, especially with asynchronous calls, is a bit too much with the current state of this sample šŸ™‚

    I get, when I just try to run a blink example in an infinite loop, this error:

    Error: EMFILE, too many open files '/sys/class/gpio/gpio0/direction'
    at Object.fs.openSync (fs.js:427:18)
    at Object.fs.writeFileSync (fs.js:966:15)
    at GPIOHelper.setPinDirectionSync (/mnt/sda1/scripts/js/gpiotest/gpiohelper.js:61:8)
    at GPIOHelper.setPinSync (/mnt/sda1/scripts/js/gpiotest/gpiohelper.js:65:10)
    at Object.<anonymous> (/mnt/sda1/scripts/js/gpiotest/test.js:15:23)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)

    I think that, perhaps it wouldn't be a bad idea to utilize a command line to fast-gpio, so that this stuff is taken care of for simple access. Until, that is, lower level and better syncing primitives are explored. This driver, I think, would best be implemented in C and wrapped up into a js lib, right? Heck, I'm not exactly well versed in getting the js side hooked up to the C low end drivers, so I wouldn't be the best person to ask.

    In any case, this is a good start and proves that your system works. Of course, for pins, EBUSY doesn't make any sense for those coming from the arduino/avr world. But, having linux on your device is going to expose all the ugly embedded nonsense that makes it not that fun šŸ˜ž

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  • Theodore Borromeo

    @Dan-L. Cool! I'm honestly not really that great with Javascript yet, just knowledgeable enough to get myself into and out of trouble. However, the reason I bought the omega was the idea that we as the community could define node packages, have node.js on device, and just extend the capabilities for the device with npm.

    The solution I stumbled upon did seem to have npm, and can be built with the script:
    https://github.com/nneves/openwrt_mips_ar9331_nodejs/blob/master/npm_mips_ar9331.sh

    So, when I get time on Monday, I'll probably have to update the Dockerfile for nneve's scripts to build npm too. That should allow us to quickly iterate on stuff, push to npm, and then disseminate that way until official support for a slimmer node.js server comes from Onion, Inc. šŸ™‚

    Great stuff and great progress!

    1
  • Dan L.

    Hey @Theodore-Borromeo, can I see your blink code? I'm managing to write a bunch of things and not getting the EMFILE, too many open files message at any point. If you were using setPinSync you shouldn't get that, but maybe with just setPin you might? šŸ˜•

    0 Theodore Borromeo 1 Reply
  • Theodore Borromeo

    @Dan-L.

    // test.js
var GPIOHelper = require('./gpiohelper');

var helper = new GPIOHelper();

//blink LED hooked up to pin0
do {
    setTimeout(helper.setPinSync(0,true), 500);
    setTimeout(helper.setPinSync(1,false),500);
} while (1)

    As I don't have access to sleep() (haven't figured out how to do that yet in js), I may be hosing myself by using non-synchronized setTimeout. . . Again, js is not my forte.

    I was thinking this would be better:

     // test.js
var GPIOHelper = require('./gpiohelper');

var helper = new GPIOHelper();

function toggle(value) {
     return value == true : false ? true;
}
//blink LED hooked up to pin0
var truthy = false;
do {
    truthy = toggle(truthy);
    setInterval(helper.setPinSync(0,truthy), 2000);
} 
while (1)

    Though I left my omega at home so can't test right now šŸ˜ž

    1
  • Theodore Borromeo

    Also, as per https://github.com/paul99/v8m-rb/pull/19#issuecomment-24131056 , you can tune node via libv8 parameters via command line, which may help getting this tuned. šŸ™‚

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  • Dan L.

    Hey @Theodore-Borromeo

    setTimeout(helper.setPinSync(0,true), 500); will set the pin immediately. The first argument of setTimeout should be a function, but you're actually just passing in the return value of setPinSync (which is undefined). You probably meant to do this:

    setTimeout(function() {
    helper.setPinSync(0, true);
}, 500);

    šŸ™‚

    BUT, doing that will still just delay that call by 0.5s. If you do that a bunch of times in an infinite while loop, you're actually just queueing an infinite amount of timers to run, but since the loop never ends, the timers never get a chance to run. An infinite while/for loop will halt all timers, due to the way V8's event loop works.

    Instead you probably want to use setInterval, not in a loop:

    var lightState = false;
setInterval(function() {
	
	// Toggle
	lightState = !lightState;
	
	// Set value
	helper.setPinSync(0, lightState);
	
}, 500);

    Or you could recursively call setTimeout. This one will toggle the light on/off at random intervals:

    var lightState = false;

// Function which is triggered every 0+ to 1 seconds
var next = function() {
	
	lightState = !lightState;
	
	helper.setPinSync(0, lightState);
	
	setTimeout(next, Math.random() * 1000);
	
}

next();

    I also put some samples on GitHub šŸ˜Ž

    https://github.com/manspaniel/node-omega-gpio

    2 Theodore Borromeo 1 Reply
  • Theodore Borromeo

    @Dan-L. Yeah, as soon as I posted the do-while loop that will continuously call a function some half a second into the future, I realized that I wasn't going to get far. In any case, the do while loop was a hold over from me sleeping for half a second and toggling on and off forever.

    But I'll def take a look later and see your examples. Coincidentally, the newest firmware has a way to set the GPIO pins directly via the "GPIO Helper Tool" app! I hope that they reimplement their landing page as a webapp hosted by a node.js server running on device! That would be poetic šŸ™‚

    0 Lazar Demin 1 Reply
  • Lazar Demin
    administrators

    @Theodore-Borromeo About the Console, the front-end is implemented in HTML and Javascript, and the back-end uses the OpenWRT UBUS service, which is language independent.

    Don't worry, we plan to release a detailed guide on how to implement your own apps and how to extend the UBUS service! No definite timeline for this guide but it's definitely on our list of priorities.

    0
  • Theodore Borromeo

    @Boken-Lin @Lazar-Demin
    from borromeotlhs/onion-omega:v1

    is now available for use in a Dockerfile. it'll contain the entirety of the toolchain per your cross compile environment setup guide.

    Regards,
    TJ

    3 B 1 Reply
opkg 60 node.js 39 javascript 6
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