Add fakesensor driver.

This driver can read sensor data from csv file.

Signed-off-by: buyuer <dingddding@163.com>

include/nuttx/sensors/fakesensor.h

@@ -0,0 +1,67 @@
+/****************************************************************************
+ * include/nuttx/sensors/fakesensor.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you 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 __INCLUDE_NUTTX_SENSORS_FAKESENSOR_H
+#define __INCLUDE_NUTTX_SENSORS_FAKESENSOR_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/****************************************************************************
+ * Name: fakesensor_init
+ *
+ * Description:
+ *   This function generates a sensor node under /dev/sensor/. And then
+ *   report the data from csv file.
+ *
+ * Input Parameters:
+ *   type      - The type of sensor and Defined in <nuttx/sensors/sensor.h>
+ *   file_name - The name of csv name and the file structure is as follows:
+ *               First row : set interval,  unit millisecond
+ *               Second row: csv file header
+ *               third row : data
+ *               (Each line should not exceed 50 characters)
+ *               For example:
+ *               interval:12
+ *               x,y,z
+ *               2.1234,3.23443,2.23456
+ *               ...
+ *   devno     - The user specifies which device of this type, from 0.
+ ****************************************************************************/
+
+int fakesensor_init(int type, FAR const char *file_name, int devno);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif