Allow i2cConfig(options) to pass address object.

This is necessary for supporting LCD JHD1313M1 which has 2 addresses:

- lcd
- rgb (Backlight control)

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

lib/tessel.js

@@ -589,6 +589,7 @@ Tessel.prototype.servoWrite = function(pin, value) {
 // Note: Tessel-IO will default to Port A if no bus is specified.
 Tessel.prototype.i2cConfig = function(options) {
   var state = priv.get(this);
+  var addresses = [];
   var delay;
 
   if (options === undefined) {
@@ -613,17 +614,23 @@ Tessel.prototype.i2cConfig = function(options) {
     }
   }
 
-  if (options.addresses && Array.isArray(options.addresses)) {
-    options.addresses.forEach(function(address) {
-      if (address && !state.i2c[address]) {
-        state.i2c[address] = new tessel.port[ToI2CBusPort(options.bus)].I2C(address);
-      }
-    });
+  if (typeof options.address === "number") {
+    addresses = [options.address];
   } else {
-    if (options.address && !state.i2c[options.address]) {
-      state.i2c[options.address] = new tessel.port[ToI2CBusPort(options.bus)].I2C(options.address);
+    if (typeof options.address === "object" && options.address !== null) {
+      addresses = Object.keys(options.address).map(key => options.address[key]);
     }
   }
+
+  if (options.addresses && Array.isArray(options.addresses)) {
+    addresses = addresses.concat(options.addresses);
+  }
+
+  addresses.forEach(function(address) {
+    if (address && !state.i2c[address]) {
+      state.i2c[address] = new tessel.port[ToI2CBusPort(options.bus)].I2C(address);
+    }
+  });
 };
 
 // Map to Board.prototype.sendI2CWriteRequest

test/tessel.js

@@ -1109,6 +1109,16 @@ exports["Tessel.prototype.i2cConfig"] = {
     test.done();
   },
 
+  calledWithObjectOfAddresses: function(test) {
+    test.expect(3);
+    this.tessel.i2cConfig({ address: { lcd: 0x04, rgb: 0x05 }, port: "B" });
+    // One call for each address
+    test.equal(this.b.callCount, 2);
+    test.equal(this.b.firstCall.args[0], 0x04);
+    test.equal(this.b.lastCall.args[0], 0x05);
+    test.done();
+  }
+
 };
 
 exports["Tessel.prototype.i2cWrite"] = {