usb_connected.c
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/****************************************************************************
*
* 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.c
*
* @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>
__EXPORT int usb_connected_main(int argc, char *argv[]);
static void print_usage(void)
{
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");
}
int
usb_connected_main(int argc, char *argv[])
{
if (argc > 1) {
print_usage();
return 0;
}
return board_read_VBUS_state();
}