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