90 lines
3.7 KiB
JavaScript
90 lines
3.7 KiB
JavaScript
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module.exports = function(RED) {
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"use strict";
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var fs = require('fs');
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var allOK = false;
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var mcpadc;
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// unlikely if not on a Pi
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try {
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var cpuinfo = fs.readFileSync("/proc/cpuinfo").toString();
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if (cpuinfo.indexOf(": BCM") === -1) {
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RED.log.warn("Info : mcp3xxx : Not running on a Pi - Ignoring node");
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}
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else {
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mcpadc = require('mcp-spi-adc');
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allOK = true;
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}
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}
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catch(err) {
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RED.log.warn("Info : mcp3xxx : Not running on a Pi - Ignoring node");
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}
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//var mcp3xxx = [];
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function PiMcpNode(n) {
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RED.nodes.createNode(this,n);
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this.pin = n.pin || 0;
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this.interval = n.interval || 1000;
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this.dnum = parseInt(n.dnum) || 0;
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this.bus = parseInt(n.bus) || 0;
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this.dev = n.dev || "3008";
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this.mcp3xxx = [];
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this.cb = function (err) { if (err) { node.error("Error: "+err); } };
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this.opt = { speedHz:20000, deviceNumber:this.dnum, busNumber:this.bus };
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var chans = parseInt(this.dev.substr(3));
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var node = this;
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if (allOK === true) {
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try {
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fs.statSync("/dev/spidev"+node.bus+"."+node.dnum);
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if (node.mcp3xxx.length === 0) {
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for (var i=0; i<chans; i++) {
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if (node.dev === "3002") { node.mcp3xxx.push(mcpadc.openMcp3002(i, node.opt, node.cb)); }
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if (node.dev === "3004") { node.mcp3xxx.push(mcpadc.openMcp3004(i, node.opt, node.cb)); }
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if (node.dev === "3008") { node.mcp3xxx.push(mcpadc.openMcp3008(i, node.opt, node.cb)); }
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if (node.dev === "3201") { node.mcp3xxx.push(mcpadc.openMcp3201(i, node.opt, node.cb)); }
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if (node.dev === "3202") { node.mcp3xxx.push(mcpadc.openMcp3202(i, node.opt, node.cb)); }
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if (node.dev === "3204") { node.mcp3xxx.push(mcpadc.openMcp3204(i, node.opt, node.cb)); }
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if (node.dev === "3208") { node.mcp3xxx.push(mcpadc.openMcp3208(i, node.opt, node.cb)); }
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if (node.dev === "3304") { node.mcp3xxx.push(mcpadc.openMcp3304(i, node.opt, node.cb)); }
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}
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}
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node.on("input", function(msg) {
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var pin = null;
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if (node.pin === "M") {
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var pay = parseInt(msg.payload.toString());
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if ((pay >= 0) && (pay < chans)) { pin = pay; }
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else { node.warn("Payload needs to select channel 0 to "+(chans-1)); }
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}
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else { pin = parseInt(node.pin); }
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if (pin !== null) {
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node.mcp3xxx[pin].read(function (err, reading) {
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if (err) { node.warn("Read error: "+err); }
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else { node.send({payload:reading.rawValue, topic:"adc/"+pin}); }
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});
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}
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});
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}
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catch(err) {
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node.error("Error : Can't find SPI device - is SPI enabled in raspi-config ?"+ err);
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}
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node.on("close", function(done) {
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if (node.mcp3xxx.length !== 0) {
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var j=0;
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for (var i=0; i<chans; i++) {
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node.mcp3xxx[i].close(function() { j += 1; if (j === chans) {done()} });
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}
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node.mcp3xxx = [];
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}
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else { done(); }
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});
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}
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else {
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node.status({text:"node inactive."})
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}
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}
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RED.nodes.registerType("pimcp3008",PiMcpNode);
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}
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