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examples/tmp112: Add new example for TMP112 temperature sensor

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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>
This commit is contained in:
Niccolò Maggioni 2025-08-14 16:24:30 +02:00 • committed by Xiang Xiao
parent d8dcc9926e
commit 14a39ee7ce
5 changed files with 201 additions and 0 deletions
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35
examples/tmp112/CMakeLists.txt Normal file
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# ##############################################################################
# apps/examples/tmp112/CMakeLists.txt
#
# 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.
#
# ##############################################################################
if(CONFIG_EXAMPLES_TMP112)
nuttx_add_application(
NAME
${CONFIG_EXAMPLES_TMP112_PROGNAME}
PRIORITY
${CONFIG_EXAMPLES_TMP112_PRIORITY}
STACKSIZE
${CONFIG_EXAMPLES_TMP112_STACKSIZE}
MODULE
${CONFIG_EXAMPLES_TMP112}
SRCS
tmp112_main.c)
endif()

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examples/tmp112/Kconfig Normal file
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#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#
config EXAMPLES_TMP112
tristate "TMP112 temperature sensor example"
default n
depends on SENSORS_TMP112
---help---
Enable the TMP112 example
if EXAMPLES_TMP112
config EXAMPLES_TMP112_PROGNAME
string "Program name"
default "tmp112"
---help---
This is the name of the program that will be used when the NSH ELF
program is installed.
config EXAMPLES_TMP112_PRIORITY
int "TMP112 task priority"
default 100
config EXAMPLES_TMP112_STACKSIZE
int "TMP112 stack size"
default DEFAULT_TASK_STACKSIZE
config EXAMPLES_TMP112_DEVPATH
string "TMP112 device path"
default "/dev/temp0"
---help---
The default path to the TMP112 temperature sensor device
endif

25
examples/tmp112/Make.defs Normal file
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############################################################################
# apps/examples/tmp112/Make.defs
#
# 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.
#
############################################################################
ifneq ($(CONFIG_EXAMPLES_TMP112),)
CONFIGURED_APPS += $(APPDIR)/examples/tmp112
endif

36
examples/tmp112/Makefile Normal file
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############################################################################
# apps/examples/tmp112/Makefile
#
# 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.
#
############################################################################
include $(APPDIR)/Make.defs
# TMP112 temperature sensor example built-in application info
PROGNAME = $(CONFIG_EXAMPLES_TMP112_PROGNAME)
PRIORITY = $(CONFIG_EXAMPLES_TMP112_PRIORITY)
STACKSIZE = $(CONFIG_EXAMPLES_TMP112_STACKSIZE)
MODULE = $(CONFIG_EXAMPLES_TMP112)
# TMP112 temperature sensor example
MAINSRC = tmp112_main.c
include $(APPDIR)/Application.mk

69
examples/tmp112/tmp112_main.c Normal file
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/****************************************************************************
* 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;
}