add servo support

added servo support , used @chnewso 's fork for reference
tested on BealeBone Blue BeagleBoard.org Debian Image 2018-03-05
Linux beaglebone 4.9.105-ti-r113
rc_version : 0.4.4
fix indendation issues

binding.gyp

@@ -3,18 +3,18 @@
         {
             "target_name": "roboticscape",
 	    "variables": {
-		   'RC_version': '<!(rc_version)',
+		   'RC_version': '<!(rc_version)'
             },
             "conditions": [
                     ['RC_version=="0.3.4"', {
-                      'sources': [
-                          'rc-node-bindings034.cc'
-                      ],
+                          'sources': [
+                              'rc-node-bindings034.cc'
+                          ]
                     }],
                     ['RC_version!="0.3.4"', {
                           'sources': [
                               'rc-node-bindings041.cc'
-                          ],
+                          ]
                     }]
             ],
             "cflags": [ "-Wall", "-g", "-std=c++1y" ],

rc-node-bindings041.cc

@@ -330,6 +330,44 @@ namespace rc {
         info.GetReturnValue().Set(value);
     }
 
+    void RCservo(const Nan::FunctionCallbackInfo<v8::Value>& info) {
+        int result = 0;
+        if (info.Length() == 1) {
+            if (info[0]->IsString()) {
+                v8::String::Utf8Value str(info[0]->ToString());
+                char * s = (char *)*str;
+                if (!strcmp(s, "ENABLE")) rc_servo_init();
+                else if (!strcmp(s, "POWER_RAIL_ENABLE")) rc_servo_power_rail_en(1);
+                else if (!strcmp(s, "POWER_RAIL_DISABLE")) rc_servo_power_rail_en(0);
+                else if (!strcmp(s, "DISABLE")) rc_servo_cleanup();
+                else {
+                    Nan::ThrowTypeError("Wrong value (should be "\
+                        "'ENABLE', 'DISABLE' "\
+                        "'POWER_RAIL_ENABLE', 'POWER_RAIL_DISABLE' or a numeric channel no)");
+                }
+                return;
+            }
+            else {
+              Nan::ThrowTypeError("Wrong type for argument (should be String)");
+              return;
+            }
+        }
+        else {
+            if (!info[0]->IsInt32()) {
+                Nan::ThrowTypeError("Wrong type for argument (should be integer)");
+                return;
+            }
+            int channel = (int)info[0]->ToInt32()->Value();
+            float value = (float)info[1]->ToNumber()->Value();
+            if (channel < 0 || channel > 8) {
+                Nan::ThrowTypeError("Wrong value for argument 1 (should be between 0 and 8)");
+                return;
+            }
+            result = rc_servo_send_pulse_normalized(channel, value );
+            info.GetReturnValue().Set(result);
+      }
+    }
+
     void ModuleInit(v8::Local<v8::Object> exports) {
         /* Init and Cleanup */
         exports->Set(Nan::New("initialize").ToLocalChecked(),
@@ -352,6 +390,9 @@ namespace rc {
         /* ADC */
         exports->Set(Nan::New("adc").ToLocalChecked(),
             Nan::New<v8::FunctionTemplate>(RCadc)->GetFunction());
+        /* Servo */
+        exports->Set(Nan::New("servo").ToLocalChecked(),
+            Nan::New<v8::FunctionTemplate>(RCservo)->GetFunction());
         node::AtExit(RCexit);
     }