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/****************************************************************************
* apps/system/lm75/lm75.c
*
* Copyright (C) 2015 Gregory Nutt. All rights reserved.
* Authors: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <sys/types.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <fixedmath.h>
#include <nuttx/sensors/lm75.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_SYSTEM_LM75_DEVNAME
# warning CONFIG_SYSTEM_LM75_DEVNAME is not defined
# define CONFIG_SYSTEM_LM75_DEVNAME "/dev/temp"
#endif
#if !defined(CONFIG_SYSTEM_LM75_FAHRENHEIT) && !defined(CONFIG_SYSTEM_LM75_CENTIGRADE)
# warning one of CONFIG_SYSTEM_LM75_FAHRENHEIT or CONFIG_SYSTEM_LM75_CENTIGRADE must be defined
# defeind CONFIG_SYSTEM_LM75_FAHRENHEIT 1
#endif
#if defined(CONFIG_SYSTEM_LM75_FAHRENHEIT) && defined(CONFIG_SYSTEM_LM75_CENTIGRADE)
# warning both of CONFIG_SYSTEM_LM75_FAHRENHEIT and CONFIG_SYSTEM_LM75_CENTIGRADE defined
# undef CONFIG_SYSTEM_LM75_CENTIGRADE
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
#ifdef CONFIG_BUILD_KERNEL
int main(int argc, FAR char *argv[])
#else
int lm75_main(int argc, char *argv[])
#endif
{
#ifdef CONFIG_LIBC_FLOATINGPOINT
double temp;
#endif
b16_t temp16;
ssize_t nbytes;
int fd;
int ret;
/* Open the temperature sensor device */
fd = open(CONFIG_SYSTEM_LM75_DEVNAME, O_RDONLY);
if (fd < 0)
{
fprintf(stderr, "ERROR: Failed to open %s: %d\n",
CONFIG_SYSTEM_LM75_DEVNAME, errno);
return EXIT_FAILURE;
}
#ifdef CONFIG_SYSTEM_LM75_FAHRENHEIT
/* Select Fahrenheit scaling */
ret = ioctl(fd, SNIOC_FAHRENHEIT, 0);
if (ret < 0)
{
fprintf(stderr, "ERROR: ioctl(SNIOC_FAHRENHEIT) failed: %d\n",
errno);
return EXIT_FAILURE;
}
#else
/* Select Fahrenheit scaling */
ret = ioctl(fd, SNIOC_CENTIGRADE, 0);
if (ret < 0)
{
fprintf(stderr, "ERROR: ioctl(SNIOC_CENTIGRADE) failed: %d\n",
errno);
return EXIT_FAILURE;
}
#endif
/* Read the current temperature as a fixed precision number */
nbytes = read(fd, &temp16, sizeof(b16_t));
close(fd);
if (nbytes < 0)
{
fprintf(stderr, "ERROR: read(%d) failed: %d\n",
sizeof(b16_t), errno);
return EXIT_FAILURE;
}
if (nbytes != sizeof(b16_t))
{
fprintf(stderr, "ERROR: Unexpected read size: %Ld vs %d\n",
(long)nbytes, sizeof(b16_t));
return EXIT_FAILURE;
}
/* Print the current temperature on stdout */
#ifdef CONFIG_LIBC_FLOATINGPOINT
temp = (double)temp16 / 65536.0;
#ifdef CONFIG_SYSTEM_LM75_FAHRENHEIT
printf("%3.2f degrees Fahrenheit\n", temp);
#else
printf("%3.2f degrees Centigrade\n", temp);
#endif
#else
#ifdef CONFIG_SYSTEM_LM75_FAHRENHEIT
printf("0x%04x.%04x degrees Fahrenheit\n", temp16 >> 16, temp16 & 0xffff);
#else
printf("0x%04x.%04x degrees Centigrade\n", temp16 >> 16, temp16 & 0xffff);
#endif
#endif
return EXIT_SUCCESS;
}
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