gpioprobe

Macros
#define	APP_EC_OK   0
	success exit code
#define	APP_EC_ARGS   2
	command-line options/arguments error exit code
#define	APP_EC_EXEC   4
	execution exit code

Functions
static int	strToInt (const string &str, int &val)
static int	strToBits (const string &str, byte_t *p)
static void	mainInit (int argc, char *argv[])
	Main initialization. More...
static int	sysfsProbe (gpio_info_t *pInfo)
	Probe GPIO state. More...
static int	sysfsProbeAndPrint ()
int	main (int argc, char *argv[])
	Main. More...

Variables
static char *	Argv0
	the command
static char *	OptsMethod = (char *)"sysfs"
	system file system
static int	ArgsGpio
	gpio number
static OptsPgmInfo_T	PgmInfo
	Program information. More...
static OptsInfo_T	OptsInfo []
	Command line options information. More...

Detailed Description

Function Documentation

int main	(	int	argc,
		char *	argv[]
	)

Main.

Parameters

argc	Command-line argument count.
argv	Command-line argument list.

Returns

Returns 0 on succes, non-zero on failure.

Definition at line 400 of file gpioprobe.cxx.

References APP_EC_ARGS, mainInit(), and OptsMethod.

{
  int   ec;

  mainInit(argc, argv);

  if( !strcmp(OptsMethod, "sysfs") )
  {
    ec = sysfsProbeAndPrint();
  }
#ifdef MMAP_GPIO
  else if( !strcmp(OptsMethod, "mmap") )
  {
    ec = mmapProbeAndPrint();
  }
#endif // MMAP_GPIO
  else
  {
    fprintf(stderr,"%s: Unknown GPIO access method.", OptsMethod);
    ec = APP_EC_ARGS;
  }

  return ec;
}

static void mainInit ( int  argc, char *  argv[]  )

static

Main initialization.

Parameters

argc	Command-line argument count.
argv	Command-line argument list.

Exits:

Program terminates on conversion error.

Definition at line 163 of file gpioprobe.cxx.

References APP_EC_ARGS, ArgsGpio, Argv0, OptsInfo, PgmInfo, and PkgInfo.

Referenced by main().

{
  // name of this process
  Argv0 = basename(argv[0]);

  // parse input options
  argv = OptsGet(Argv0, &PkgInfo, &PgmInfo, OptsInfo, true, &argc, argv);

  if( argc == 0 )
  {
    fprintf(stderr, "%s: No exported GPIO/header pin number specified.\n",
        Argv0);
    fprintf(stderr, "Try '%s --help' for more information.\n", Argv0);
    exit(APP_EC_ARGS);
  }

  else if( strToInt(argv[0], ArgsGpio) < 0 )
  {
    fprintf(stderr, "%s: '%s': Bad GPIO number.\n", Argv0, argv[0]);
    fprintf(stderr, "Try '%s --help' for more information.\n", Argv0);
    exit(APP_EC_ARGS);
  }
}

static int sysfsProbe ( gpio_info_t *  pInfo )

static

Probe GPIO state.

Method: sysfs

Parameters

[out]

pInfo

Pointer to GPIO info.

Returns

Application exit code.

Definition at line 196 of file gpioprobe.cxx.

References APP_EC_EXEC, APP_EC_OK, ArgsGpio, gpio_info_t::dir, gpio_info_t::edge, gpio_info_t::gpio, GPIO_DIR_IN, GPIO_DIR_IN_STR, GPIO_DIR_OUT, GPIO_DIR_OUT_STR, GPIO_EDGE_BOTH, GPIO_EDGE_BOTH_STR, GPIO_EDGE_FALLING, GPIO_EDGE_FALLING_STR, GPIO_EDGE_NONE, GPIO_EDGE_NONE_STR, GPIO_EDGE_RISING, GPIO_EDGE_RISING_STR, GPIO_PULL_DN, GPIO_PULL_DN_STR, GPIO_PULL_DS_STR, GPIO_PULL_UP, GPIO_PULL_UP_STR, gpioProbe(), gpio_info_t::pin, and gpio_info_t::value.

{
  int   ec;

  if( gpioProbe(ArgsGpio, pInfo) < 0 )
  {
    ec = APP_EC_EXEC;
  }
  else
  {
    ec = APP_EC_OK;
  }

  return ec;
}

Variable Documentation

OptsInfo_T OptsInfo[]

static

Initial value:

=
{














 

  {NULL, }
}

Command line options information.

Definition at line 82 of file gpioprobe.cxx.

Referenced by mainInit().

OptsPgmInfo_T PgmInfo

static

Initial value:

=
{
  
  "<gpio>",

  
  "Safely probe GPIO settings and state.",

  
  "The %P command probes the settings and state of GPIO exported number.",

  
  NULL
}

Program information.

Definition at line 64 of file gpioprobe.cxx.

Referenced by mainInit().