node-red-nodes/hardware/intel/mraa-gpio-pwm.js

/**
 * Copyright 2015 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

module.exports = function(RED) {
    var m = require('mraa');

    function gpioPWM(n) {
        RED.nodes.createNode(this, n);
        this.pin = Number(n.pin);
        this.period = Number(n.period) || 100;
        var node = this;
        node.p = new m.Pwm(node.pin);
        //node.p.dir(m.DIR_OUT);
        //node.p.mode(m.PIN_PWM);
        node.p.enable(true);
        node.p.period_ms(node.period);

        node.on("input", function(msg) {
            if (msg.payload) {
                node.p.write(Number(msg.payload));
            }
        });

        this.on('close', function() {
            node.p.enable(false);
        });
    }
    RED.nodes.registerType("mraa-gpio-pwm", gpioPWM);

    RED.httpAdmin.get('/mraa-gpio/:id', RED.auth.needsPermission('mraa-gpio.read'), function(req,res) {
        res.json(m.getPlatformType());
    });

    RED.httpAdmin.get('/mraa-version/:id', RED.auth.needsPermission('mraa-version.read'), function(req,res) {
        res.json(m.getVersion());
    });
}