node-red-contrib-pitft/pitft-node.js

Node red node for lcd on framebuffer.

module.exports = function(RED) {
    var pitft = require("pitft");
    var vm = require('vm');
    function PiTftOutNode(config) {
        var node = this;
        RED.nodes.createNode(this, config);
        this.device = config.device || "/dev/fb1";
        this.script = vm.createScript(config.script || "");
        this.fb = pitft(this.device);
        var sandbox = {
            fb: this.fb,
            log: this.log,
            warn: this.warn,
            error: this.error,
            status: this.status,
            context: {
                global:RED.settings.functionGlobalContext || {}
            },
            setTimeout: setTimeout,
            clearTimeout: clearTimeout
        };
        var context = vm.createContext(sandbox);
        try {
            this.script.runInContext(context);
            if (context.update != undefined) {
                this.on("input", function(msg) {
                    context.update(msg);
                });
            }
            if (context.close != undefined) {
                this.on("close", context.close);
            }
        } catch(err) {
            // eg SyntaxError - which v8 doesn't include line number information
            // so we can't do better than this
            this.error(err);
        }
    }
    RED.nodes.registerType("pitft out", PiTftOutNode);
};