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14a39ee7ce
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>
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/****************************************************************************
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* apps/examples/tmp112/tmp112_main.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tmp112_main
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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int fd;
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int ret;
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float sample;
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fd = open(CONFIG_EXAMPLES_TMP112_DEVPATH, O_RDONLY);
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if (fd < 0)
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{
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printf("Failed to open TMP112 sensor at %s: %s (%d)\n",
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CONFIG_EXAMPLES_TMP112_DEVPATH, strerror(errno), errno);
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return EXIT_FAILURE;
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}
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ret = read(fd, &sample, sizeof(float));
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if (ret != sizeof(sample))
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{
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perror("Could not read");
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ret = EXIT_FAILURE;
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}
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else
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{
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printf("TMP112 = %.03f degrees Celsius\n", sample);
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ret = EXIT_SUCCESS;
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}
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close(fd);
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return ret;
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}
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