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usb_connected: add documentation

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This commit is contained in:
Beat Küng 2017-05-04 16:44:01 +02:00
parent 8e965a7a2a
commit 68d754b65e
1 changed files with 16 additions and 2 deletions
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18
src/systemcmds/usb_connected/usb_connected.c
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@ -34,12 +34,11 @@
/**
* @file usb_connected.c
*
* utility to check if USB is connected. Used in startup scripts
*
* @author Andrew Tridgell
*/
#include <px4_config.h>
#include <px4_module.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
@ -49,8 +48,23 @@
__EXPORT int usb_connected_main(int argc, char *argv[]);
static void print_usage()
{
PRINT_MODULE_DESCRIPTION("Utility to check if USB is connected. Was previously used in startup scripts. "
"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 px4_arch_gpioread(GPIO_OTGFS_VBUS) ? 0 : 1;
}