Modify the file main.cpp for M487

Revision:
0:a67fc999dd68
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/NuMaker-mbed-NuBrick/NuBrickMasterGas.h	Fri Sep 29 05:44:02 2017 +0000
@@ -0,0 +1,48 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef NUBRICK_MASTER_GAS_H
+#define NUBRICK_MASTER_GAS_H
+
+#include "mbed.h"
+#include "NuBrickMaster.h"
+
+
+/** A NuMaker Brick I2C master, used for communicating with NuMaker Brick I2C slave module Gas
+ *
+ * @Note Synchronization level: Thread safe
+ *
+ * @details Support fields for access through [] operator:
+ *          - feature.sleep_period
+ *          - feature.gas_AT
+ *          - input.gas
+ *          - input.over_flag
+ */
+class NuBrickMasterGas : public NuBrickMaster {
+
+public:
+
+    /** Create an I2C interface, connected to the specified pins
+     *
+     *  @param i2c I2C object
+     */
+    NuBrickMasterGas(I2C &i2c, bool debug);
+
+    virtual ~NuBrickMasterGas() {
+        // Do nothing
+    }
+};
+
+#endif