px4-firmware/apps/system/i2c/i2c_common.c

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/****************************************************************************
* apps/system/i2c/i2c_common.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdlib.h>
#include "i2ctool.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: common_args
****************************************************************************/
int common_args(FAR struct i2ctool_s *i2ctool, FAR char **arg)
{
FAR char *ptr = *arg;
long value;
int ret;
if (ptr[0] != '-')
{
goto invalid_argument;
}
switch (ptr[1])
{
case 'a':
ret = arg_hex(arg, &value);
if (value < CONFIG_I2CTOOL_MINADDR || value > CONFIG_I2CTOOL_MAXADDR)
{
goto out_of_range;
}
i2ctool->addr = (uint8_t) value;
return ret;
case 'b':
ret = arg_decimal(arg, &value);
if (value < CONFIG_I2CTOOL_MINBUS || value > CONFIG_I2CTOOL_MAXBUS)
{
goto out_of_range;
}
i2ctool->bus = (uint8_t) value;
return ret;
case 'f':
ret = arg_decimal(arg, &value);
if (value == 0)
{
goto out_of_range;
}
i2ctool->freq = value;
return ret;
case 'i':
i2ctool->autoincr = true;
return 1;
case 'j':
i2ctool->autoincr = false;
return 1;
case 'n':
i2ctool->start = false;
return 1;
case 'r':
ret = arg_hex(arg, &value);
if (value < 0 || value > CONFIG_I2CTOOL_MAXREGADDR)
{
goto out_of_range;
}
i2ctool->regaddr = (uint8_t) value;
return ret;
case 's':
i2ctool->start = true;
return 1;
case 'w':
ret = arg_decimal(arg, &value);
if (value != 8 && value != 16)
{
goto out_of_range;
}
i2ctool->width = (uint8_t) value;
return ret;
default:
goto invalid_argument;
}
invalid_argument:
i2ctool_printf(i2ctool, g_i2carginvalid, ptr);
return ERROR;
out_of_range:
i2ctool_printf(i2ctool, g_i2cargrange, ptr);
return ERROR;
}
/****************************************************************************
* Name: arg_string
****************************************************************************/
int arg_string(FAR char **arg, FAR char **value)
{
FAR char *ptr = *arg;
if (ptr[2] == '\0')
{
*value = arg[1];
return 2;
}
else
{
*value = &ptr[2];
return 1;
}
}
/****************************************************************************
* Name: arg_decimal
****************************************************************************/
int arg_decimal(FAR char **arg, FAR long *value)
{
FAR char *string;
int ret;
ret = arg_string(arg, &string);
*value = strtol(string, NULL, 10);
return ret;
}
/****************************************************************************
* Name: arg_hex
****************************************************************************/
int arg_hex(FAR char **arg, FAR long *value)
{
FAR char *string;
int ret;
ret = arg_string(arg, &string);
*value = strtol(string, NULL, 16);
return ret;
}