systemcmds: convert c -> c++

src/systemcmds/usb_connected/usb_connected.cpp

@@ -0,0 +1,65 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2014 Andrew Tridgell. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file usb_connected.cpp
+ *
+ * @author Andrew Tridgell
+ */
+
+#include <px4_platform_common/px4_config.h>
+#include <px4_platform_common/module.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <board_config.h>
+
+static void print_usage()
+{
+	PRINT_MODULE_DESCRIPTION("Utility to check if USB is connected. Was previously used in startup scripts.\n"
+				 "A return value of 0 means USB is connected, 1 otherwise."
+				);
+
+	PRINT_MODULE_USAGE_NAME_SIMPLE("usb_connected", "command");
+}
+
+extern "C" __EXPORT int usb_connected_main(int argc, char *argv[])
+{
+	if (argc > 1) {
+		print_usage();
+		return 0;
+	}
+
+	return board_read_VBUS_state();
+}