first commit and add gitignore, README.md

component/common/mbed/hal_ext/i2c_ex_api.h

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+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 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 I2C_EX_API_H
+#define I2C_EX_API_H
+
+#include "device.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    I2C_TX_COMPLETE     = 0,
+    I2C_RX_COMPLETE     = 1,
+    I2C_ERR_OCCURRED    = 2
+}I2CCallback;
+
+void i2c_set_user_callback(i2c_t *obj, I2CCallback i2ccb, void(*i2c_callback)(void *));
+void i2c_clear_user_callback(i2c_t *obj, I2CCallback i2ccb);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+