Problems with more than one MCP3008 (#823)

* Add files via upload

* Update pimcp3008.js

implementation of the discussion

* Update pimcp3008.js

Co-authored-by: Dave Conway-Jones <[email protected]>

Author: CD2468

hardware/mcp3008/pimcp3008.html

@@ -32,6 +32,7 @@
         <select type="text" id="node-input-dnum" style="width:150px;">
           <option value=0>CE0</option>
           <option value=1>CE1</option>
+	  <option value=2>CE2</option>	
         </select>
     </div>
     <div class="form-row">
@@ -77,7 +78,7 @@
         outputs: 1,
         icon: "rpi.png",
         label: function() {
-            return this.name || "mcp"+this.dev+" "+((this.pin==="M")?"":this.pin);
+            return this.name || "mcp:"+this.dev+" "+" bus:"+this.bus+" CS:"+this.dnum+" pin:"+((this.pin==="M")?"":this.pin);
         },
         labelStyle: function() {
             return this.name?"node_label_italic":"";

hardware/mcp3008/pimcp3008.js

@@ -19,7 +19,7 @@ module.exports = function(RED) {
         RED.log.warn("Info : mcp3xxx : Not running on a Pi - Ignoring node");
     }
 
-    var mcp3xxx = [];
+    //var mcp3xxx = [];
 
     function PiMcpNode(n) {
         RED.nodes.createNode(this,n);
@@ -28,15 +28,17 @@ module.exports = function(RED) {
         this.dnum = parseInt(n.dnum || 0);
         this.bus = parseInt(n.bus || 0);
         this.dev = n.dev || "3008";
+        this.mcp3xxx = [];
         var node = this;
-        var cb = function (err) { if (err) { node.error("Error: "+err); } };
-        var opt = { speedHz:20000, deviceNumber:node.dnum, busNumber:node.bus };
+        this.cb = function (err) { if (err) { node.error("Error: "+err); } };
+        this.opt = { speedHz:20000, deviceNumber:node.dnum, busNumber:node.bus };
         var chans = parseInt(this.dev.substr(3));
+        var node = this;
 
         if (allOK === true) {
             try {
                 fs.statSync("/dev/spidev"+node.bus+"."+node.dnum);
-                if (mcp3xxx.length === 0) {
+                if (node.mcp3xxx.length === 0) {
                     for (var i=0; i<chans; i++) {
                         if (node.dev === "3002") { mcp3xxx.push(mcpadc.openMcp3002(i, opt, cb)); }
                         if (node.dev === "3004") { mcp3xxx.push(mcpadc.openMcp3004(i, opt, cb)); }
@@ -57,22 +59,22 @@ module.exports = function(RED) {
                     }
                     else { pin = parseInt(node.pin); }
                     if (pin !== null) {
-                        mcp3xxx[pin].read(function (err, reading) {
+                        node.mcp3xxx[pin].read(function (err, reading) {
                             if (err) { node.warn("Read error: "+err); }
                             else { node.send({payload:reading.rawValue, topic:"adc/"+pin}); }
                         });
                     }
                 });
             }
             catch(err) {
-                node.error("Error : Can't find SPI device - is SPI enabled in raspi-config ?");
+                node.error("Error : Can't find SPI device - is SPI enabled in raspi-config ?"+ err);
             }
 
             node.on("close", function(done) {
-                if (mcp3xxx.length !== 0) {
+                if (node.mcp3xxx.length !== 0) {
                     var j=0;
                     for (var i=0; i<chans; i++) {
-                        mcp3xxx[i].close(function() { j += 1; if (j === chans) {done()} });
+                        node.mcp3xxx[i].close(function() { j += 1; if (j === chans) {done()} });
                     }
                     mcp3xxx = [];
                 }