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node-red/nodes/hardware/35-rpi-gpio-out.js
2013-09-05 15:02:48 +01:00

52 lines
1.3 KiB
JavaScript

/**
* Copyright 2013 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.
**/
var RED = require("../../red/red");
var gpio = require("pi-gpio");
function GPIOOutNode(n) {
RED.nodes.createNode(this,n);
this.pin = n.pin;
var node = this;
if (this.pin) {
gpio.open(this.pin,"output",function(err) {
if (err) {
node.error(err);
} else {
node.on("input",function(msg) {
gpio.write(node.pin,msg.payload,function(err) {
if (err) node.error(err);
});
});
}
});
} else {
this.error("Invalid GPIO pin: "+this.pin);
}
}
RED.nodes.registerType("rpi-gpio out",GPIOOutNode);
GPIOOutNode.prototype.close = function() {
gpio.close(this.pin);
}