Track digitalPortQueue as bits

firmata · Aug 24, 2018 · 7949f3f · 7949f3f
1 parent e8b9211
commit 7949f3f
Showing 1 changed file with 9 additions and 7 deletions.
diff --git a/lib/firmata.js b/lib/firmata.js
@@ -10,7 +10,7 @@ var com = require("./com");
 
 // Program specifics
 var i2cActive = new Map();
-var digitalPortQueue = [];
+var digitalPortQueue = 0x0000;
 
 /**
  * constants
@@ -958,9 +958,9 @@ Board.prototype.pinMode = function(pin, mode) {
 
 Board.prototype.digitalWrite = function(pin, value, enqueue) {
   let port = this.updateDigitalPort(pin, value);
-  
+
   if (enqueue) {
-    digitalPortQueue[port] = true;
+    digitalPortQueue |= 1 << port;
   } else {
     this.writeDigitalPort(port);
   }
@@ -992,10 +992,12 @@ Board.prototype.updateDigitalPort = function(pin, value) {
  */
 
 Board.prototype.flushDigitalPorts = function() {
-  Object.keys(digitalPortQueue).forEach( port => {
-    this.writeDigitalPort(port);
-  });
-  digitalPortQueue = [];
+  for (let i = 0; i < this.ports.length; i++) {
+    if (digitalPortQueue >> i) {
+      this.writeDigitalPort(i);
+    }
+  }
+  digitalPortQueue = 0x0000;
 };
 
 /**