nuttx-apps/system/i2c/i2c_dev.c

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/****************************************************************************
* apps/system/i2c/i2c_dev.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdlib.h>
#include <nuttx/i2c/i2c_master.h>
#include "i2ctool.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: i2ccmd_dev
****************************************************************************/
int i2ccmd_dev(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
{
struct i2c_msg_s msg;
FAR char *ptr;
uint8_t regaddr;
uint8_t saveaddr;
long first;
long last;
int addr;
int nargs;
int argndx;
int ret;
int fd;
int i;
int j;
/* A register address other than zero may be provided on the command line.
* However, for backward compatibility, the address zero will be used
* unless the address is specifically included on the command line for
* this command.
*/
saveaddr = i2ctool->regaddr;
i2ctool->regaddr = 0;
/* Parse any command line arguments */
for (argndx = 1; argndx < argc; )
{
/* Break out of the loop when the last option has been parsed */
ptr = argv[argndx];
if (*ptr != '-')
{
break;
}
/* Otherwise, check for common options */
nargs = i2ctool_common_args(i2ctool, &argv[argndx]);
if (nargs < 0)
{
goto errout;
}
argndx += nargs;
}
/* There should be exactly two more things on the command line:
* The first and last addresses to be probed.
*/
if (argndx + 1 < argc)
{
first = strtol(argv[argndx], NULL, 16);
last = strtol(argv[argndx + 1], NULL, 16);
if (first < 0 || first > 0x7f || last < 0 ||
last > 0x7f || first > last)
{
i2ctool_printf(i2ctool, g_i2cargrange, argv[0]);
goto errout;
}
argndx += 2;
}
else
{
i2ctool_printf(i2ctool, g_i2cargrequired, argv[0]);
goto errout;
}
if (argndx != argc)
{
i2ctool_printf(i2ctool, g_i2ctoomanyargs, argv[0]);
goto errout;
}
/* Get a handle to the I2C bus */
fd = i2cdev_open(i2ctool->bus);
if (fd < 0)
{
i2ctool_printf(i2ctool, "Failed to get bus %d\n",
i2ctool->bus);
goto errout;
}
/* Probe each address */
i2ctool_printf(i2ctool,
" 0 1 2 3 4 5 6 7 8 9 a b c d e f\n");
for (i = 0; i < 128; i += 16)
{
i2ctool_printf(i2ctool, "%02x: ", i);
for (j = 0; j < 16; j++)
{
/* Skip addresses that are out of the selected range */
addr = i + j;
if (addr < first || addr > last)
{
i2ctool_printf(i2ctool, " ");
continue;
}
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/* Set up data structures */
regaddr = i2ctool->regaddr;
msg.frequency = i2ctool->freq;
msg.addr = addr;
msg.flags = I2C_M_READ;
msg.buffer = &regaddr;
msg.length = 1;
ret = i2cdev_transfer(fd, &msg, 1);
if (ret == OK)
{
i2ctool_printf(i2ctool, "%02x ", addr);
}
else
{
i2ctool_printf(i2ctool, "-- ");
}
i2ctool_flush(i2ctool);
}
i2ctool_printf(i2ctool, "\n");
i2ctool_flush(i2ctool);
}
close(fd);
errout:
/* Restore the previous "sticky" register address unless a new register
* address was provided on the command line. In that case the new
* register address is retained.
*/
if (i2ctool->regaddr == 0)
{
i2ctool->regaddr = saveaddr;
}
return OK;
}