i2ccheck.c File Reference

Check if I2C device with the specified address exists on the I2C Bus. More...

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <libgen.h>
#include <unistd.h>
#include "rnr/rnrconfig.h"
#include "rnr/log.h"
#include "rnr/opts.h"
#include "rnr/i2c-dev.h"
#include "rnr/i2c.h"
#include "version.h"

Go to the source code of this file.

Functions
static int	execCheck (i2c_t *pI2C, int addr)
	Execute I2C slave device check. More...
static void	MainInit (int argc, char *argv[], i2c_t *pI2C)
	Command initialization. More...
int	main (int argc, char *argv[])
	i2ccheck main() More...

Variables
static char *	Argv0
	command name
static int	OptVerbose = 0
	verbose option
static char *	OptDevName = "/dev/i2c/0"
	i2c bus device option
static int	OptDevFd = -1
	opened i2c bus device fd option
static int	OptI2CAddr = -1
	slave device address option
static OptsPgmInfo_T	I2CCheckPgmInfo
	Program Information. More...
static OptsInfo_T	I2CCheckOptsInfo []
	Command Line Options Information.

Detailed Description

Check if I2C device with the specified address exists on the I2C Bus.

LastChangedDate

2011-09-12 16:08:28 -0600 (Mon, 12 Sep 2011)

Rev

1279

Author

Robin Knight (robin.nosp@m..kni.nosp@m.ght@r.nosp@m.oadn.nosp@m.arrow.nosp@m.s.co.nosp@m.m)

Copyright

© 2007-2017. RoadNarrows LLC.
http://www.roadnarrows.com
All Rights Reserved

Definition in file i2ccheck.c.

Function Documentation

static int execCheck ( i2c_t *  pI2C, int  addr  )

static

Execute I²C slave device check.

Parameters

pI2C	Pointer to I2C handle.
addr	Slave device address.

Returns

Returns ≥ 0 on success, -1 on failure.

Definition at line 167 of file i2ccheck.c.

References Argv0, i2c_exists(), and OptVerbose.

Referenced by main().

{
  int     rc;

  if( OptVerbose )
  {
    printf("%s checking 0x%02x...\n", Argv0, (byte_t)addr);
  }

  rc = i2c_exists(pI2C, (i2c_addr_t)addr);

  if( OptVerbose )
  {
   printf("device %s\n", (rc? "found": "not found"));
  }

  return rc;
}

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

i2ccheck main()

Parameters

argc	Count of command-line options and arguments.
argv	Array of command-line options and arguments.

Returns

Exit value.

Definition at line 257 of file i2ccheck.c.

References execCheck(), MainInit(), and OptI2CAddr.

{
  i2c_t i2c;
  int   rc;

  MainInit(argc, argv, &i2c);

  rc = execCheck(&i2c, OptI2CAddr);

  return rc > 0? 0: (rc == 0? 1: 2);
}

static void MainInit ( int  argc, char *  argv[], i2c_t *  pI2C  )

static

Command initialization.

Parameters

argc	Command-line argument count.
argv	Command-line arguments.
pI2C	Pointer to I2C handle.

Definition at line 197 of file i2ccheck.c.

References i2c_struct::addr, Argv0, i2c_struct::fd, I2C_ADDR_DEV_HIGH, I2C_ADDR_DEV_LOW, i2c_open(), I2CCheckOptsInfo, I2CCheckPgmInfo, OptDevFd, OptDevName, OptI2CAddr, OptVerbose, and PkgInfo.

Referenced by main().

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

  // Get the environment
  //EnvGet();

  // Parse input arguments
  argv = OptsGet(Argv0, &PkgInfo, &I2CCheckPgmInfo, I2CCheckOptsInfo, true,
                 &argc, argv);

  // Final option checks
  if( OptI2CAddr < 0x00 )
  {
    fprintf(stderr, "%s: Address option required\n", Argv0);
    exit(EC_BAD_OPT);
  }
  else if( (OptI2CAddr < I2C_ADDR_DEV_LOW) || (OptI2CAddr > I2C_ADDR_DEV_HIGH) )
  {
    fprintf(stderr, "%s: Address out of range: 0x%x\n", Argv0, OptI2CAddr);
    exit(EC_BAD_OPT);
  }

  // Opened device specified
  if( OptDevFd >= 0 )
  {
    pI2C->fd    = OptDevFd;
    pI2C->addr  = (ushort_t)(-1);
  }

  // I2C Bus device specified
  else
  {
    if( OptDevName == NULL || OptDevName[0] == 0 )
    {
      OptDevName = "/dev/i2c/0";
    }

    if( OptVerbose )
    {
      printf("I2C device: %s\n\n", OptDevName);
    }
  
    if( i2c_open(pI2C, OptDevName) < 0 )
    {
     LOGSYSERROR("%s: Failed to open.", OptDevName);
     exit(EC_ERROR);
    }
  }
}

Variable Documentation

OptsPgmInfo_T I2CCheckPgmInfo

static

Initial value:

=
{
  .usage_args = "--address <addr>",

  .synopsis = "Check if an I2C device exists on an I2C Bus.",

  .long_desc = 
    "The %P command queries the specified I2C Bus for a device "
    "with the specified address.",

  .diagnostics = 
    "Exit status is 0 if device with address is found, 1 otherwise. "
    "Exit status is >= 2 if error(s) are encountered."
}

Program Information.

Definition at line 83 of file i2ccheck.c.

Referenced by MainInit().