Files
nuttx-apps/examples/tmp112/tmp112_main.c
Niccolò Maggioni 14a39ee7ce examples/tmp112: Add new example for TMP112 temperature sensor
Add a new example that shows how to read the temperature from a
TMP112 sensor registered on the I2C bus.

Signed-off-by: Niccolò Maggioni <nicco.maggioni+nuttx@gmail.com>
2025-08-19 14:27:45 +08:00

70 lines
2.2 KiB
C

/****************************************************************************
* apps/examples/tmp112/tmp112_main.c
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 <stdio.h>
#include <fcntl.h>
#include <unistd.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tmp112_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
int fd;
int ret;
float sample;
fd = open(CONFIG_EXAMPLES_TMP112_DEVPATH, O_RDONLY);
if (fd < 0)
{
printf("Failed to open TMP112 sensor at %s: %s (%d)\n",
CONFIG_EXAMPLES_TMP112_DEVPATH, strerror(errno), errno);
return EXIT_FAILURE;
}
ret = read(fd, &sample, sizeof(float));
if (ret != sizeof(sample))
{
perror("Could not read");
ret = EXIT_FAILURE;
}
else
{
printf("TMP112 = %.03f degrees Celsius\n", sample);
ret = EXIT_SUCCESS;
}
close(fd);
return ret;
}