gpiowrite

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 void	mainInit (int argc, char *argv[])
	Main initialization. More...
static int	sysfsWrite ()
	Write value to GPIO. More...
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 int	ArgsValue
	value to write
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 231 of file gpiowrite.cxx.

References APP_EC_ARGS, APP_EC_OK, mainInit(), OptsMethod, and sysfsWrite().

{
  int   pin;
  int   ec = APP_EC_OK;

  mainInit(argc, argv);

  if( !strcmp(OptsMethod, "sysfs") )
  {
    ec = sysfsWrite();
  }

#ifdef MMAP_GPIO
  else if( !strcmp(OptsMethod, "mmap") )
  {
    ec = mmapWrite();
  }
#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 130 of file gpiowrite.cxx.

References APP_EC_ARGS, ArgsGpio, ArgsValue, 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 GPIO pin number <gpio> 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);
  }

  if( argc == 1 )
  {
    fprintf(stderr, "%s: No value specified.\n", Argv0);
    fprintf(stderr, "Try '%s --help' for more information.\n", Argv0);
    exit(APP_EC_ARGS);
  }

  else if( (strToInt(argv[1], ArgsValue) < 0) || 
          ((ArgsValue != 0) && (ArgsValue != 1)) )
  {
    fprintf(stderr, "%s: '%s': Bad value.\n", Argv0, argv[1]);
    fprintf(stderr, "Try '%s --help' for more information.\n", Argv0);
    exit(APP_EC_ARGS);
  }
}

static int sysfsWrite ( )

static

Write value to GPIO.

Method: sysfs

Returns

Application exit code.

Definition at line 175 of file gpiowrite.cxx.

References APP_EC_EXEC, APP_EC_OK, ArgsGpio, ArgsValue, and gpioWrite().

Referenced by main().

{
  int   ec;

  if( gpioWrite(ArgsGpio, ArgsValue) < 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 86 of file gpiowrite.cxx.

Referenced by mainInit().

OptsPgmInfo_T PgmInfo

static

Initial value:

=
{
  
  "<gpio> {0 | 1}",

  
  "Write a value to a GPIO pin.",

  
  "The %P command writes the specified value to the GPIO at the given "
  "<gpio> exported number."
  "A value of 0 sets the pin low. "
  "A value of 1 set the pin high.",

  
  NULL
}

Program information.

Definition at line 65 of file gpiowrite.cxx.

Referenced by mainInit().