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

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module.exports = function(RED) {
var m = require('mraa');
//console.log("BOARD :",m.getPlatformName());
function gpioDin(n) {
RED.nodes.createNode(this,n);
this.pin = n.pin;
this.interrupt = n.interrupt;
this.mode = n.mode;
this.initialMsg = n.initial;
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this.x = new m.Gpio(parseInt(this.pin));
this.board = m.getPlatformName();
this.defaultTimeout = 100;
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var node = this;
node.x.mode(parseInt(this.mode));
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node.x.dir(m.DIR_IN);
var eventHandler = function(g) {
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var msg = { payload:g, topic:node.board+"/D"+node.pin };
switch (g) {
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case 0: {
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node.status({fill:"green",shape:"ring",text:"low"});
if (node.interrupt=== "f" || node.interrupt === "b") {
node.send(msg);
}
break;
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}
case 1: {
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node.status({fill:"green",shape:"dot",text:"high"});
if (node.interrupt=== "r" || node.interrupt === "b") {
node.send(msg);
}
break;
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}
default: {
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node.status({fill:"grey",shape:"ring",text:"unknown"});
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}
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}
}
var isrCallback = function() {
eventHandler(node.x.read());
}
node.x.isr(m.EDGE_BOTH, isrCallback);
var initialState = node.x.read();
switch (initialState) {
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case 0: {
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node.status({fill:"green",shape:"ring",text:"low"});
break;
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}
case 1: {
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node.status({fill:"green",shape:"dot",text:"high"});
break;
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}
default: {
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node.status({});
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}
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}
if (this.initialMsg) {
setTimeout(() => {
node.send( { payload: node.x.read(), topic:node.board+"/D"+node.pin } );
}, this.defaultTimeout);
}
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this.on('close', function() {
node.x.isr(m.EDGE_BOTH, null);
node.x.isrExit();
node.x.close();
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});
}
RED.nodes.registerType("mraa-gpio-din", gpioDin);
}