px4-firmware/apps/system/i2c/i2c_get.c

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/****************************************************************************
* apps/system/i2c/i2c_get.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 <nuttx/i2c.h>
#include "i2ctool.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: i2ccmd_get
****************************************************************************/
int i2ccmd_get(FAR struct i2ctool_s *i2ctool, int argc, FAR char **argv)
{
FAR struct i2c_dev_s *dev;
FAR char *ptr;
uint16_t result;
uint8_t regaddr;
long repititions;
int nargs;
int argndx;
int ret;
int i;
/* Parse any command line arguments */
for (argndx = 1; argndx < argc; )
{
/* Break out of the look when the last option has been parsed */
ptr = argv[argndx];
if (*ptr != '-')
{
break;
}
/* Otherwise, check for common options */
nargs = common_args(i2ctool, &argv[argndx]);
if (nargs < 0)
{
return ERROR;
}
argndx += nargs;
}
/* There may be one more thing on the command line: The repitition
* count.
*/
repititions = 1;
if (argndx < argc)
{
repititions = strtol(argv[argndx], NULL, 16);
if (repititions < 1)
{
i2ctool_printf(i2ctool, g_i2cargrange, argv[0]);
return ERROR;
}
argndx++;
}
if (argndx != argc)
{
i2ctool_printf(i2ctool, g_i2ctoomanyargs, argv[0]);
return ERROR;
}
/* Get a handle to the I2C bus */
dev = up_i2cinitialize(i2ctool->bus);
if (!dev)
{
i2ctool_printf(i2ctool, "Failed to get bus %d\n", i2ctool->bus);
return ERROR;
}
/* Set the frequency and the address (NOTE: Only 7-bit address supported now) */
I2C_SETFREQUENCY(dev, i2ctool->freq);
I2C_SETADDRESS(dev, i2ctool->addr, 7);
/* Loop for the requested number of repititions */
regaddr = i2ctool->regaddr;
ret = OK;
for (i = 0; i < repititions; i++)
{
/* Read from the I2C bus */
ret = i2ctool_get(i2ctool, dev, regaddr, &result);
/* Display the result */
if (ret == OK)
{
i2ctool_printf(i2ctool, "READ Bus: %d Addr: %02x Subaddr: %02x Value: ",
i2ctool->bus, i2ctool->addr, i2ctool->regaddr);
if (i2ctool->width == 8)
{
i2ctool_printf(i2ctool, "%02x\n", result);
}
else
{
i2ctool_printf(i2ctool, "%04x\n", result);
}
}
else
{
i2ctool_printf(i2ctool, g_i2cxfrerror, argv[0], -ret);
break;
}
/* Auto-increment the address if so configured */
if (i2ctool->autoincr)
{
regaddr++;
}
}
(void)up_i2cuninitialize(dev);
return ret;
}
/****************************************************************************
* Name: i2ctool_get
****************************************************************************/
int i2ctool_get(FAR struct i2ctool_s *i2ctool, FAR struct i2c_dev_s *dev,
uint8_t regaddr, uint16_t *result)
{
struct i2c_msg_s msg[2];
union
{
uint16_t data16;
uint8_t data8;
} u;
int ret;
/* Set up data structures */
msg[0].addr = i2ctool->addr;
msg[0].flags = 0;
msg[0].buffer = &regaddr;
msg[0].length = 1;
msg[1].addr = i2ctool->addr;
msg[1].flags = I2C_M_READ;
if (i2ctool->width == 8)
{
msg[1].buffer = &u.data8;
msg[1].length = 1;
}
else
{
msg[1].buffer = (uint8_t*)&u.data16;
msg[1].length = 2;
}
if (i2ctool->start)
{
ret = I2C_TRANSFER(dev, &msg[0], 1);
if (ret== OK)
{
ret = I2C_TRANSFER(dev, &msg[1], 1);
}
}
else
{
ret = I2C_TRANSFER(dev, msg, 2);
}
/* Return the result of the read operation */
if (ret == OK)
{
if (i2ctool->width == 8)
{
*result = (uint16_t)u.data8;
}
else
{
*result = u.data16;
}
}
return ret;
}