a29d9ea9da
to get the prototypes or macros are defined in it Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/****************************************************************************
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* apps/examples/ltr308/ltr308_main.c
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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 <nuttx/sensors/ioctl.h>
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#include <nuttx/sensors/sensor.h>
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#include <nuttx/sensors/ltr308.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <poll.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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* ltr308_main
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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struct ltr308_calibval calibval;
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struct sensor_light light;
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struct pollfd pfd;
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int ret;
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int fd;
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fd = open("/dev/uorb/sensor_light0", O_RDONLY);
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if (fd < 0)
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{
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perror("Could not open file");
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return fd;
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}
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calibval.integration_time = 1;
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calibval.measurement_rate = 2;
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calibval.gain = 1;
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ret = ioctl(fd, SNIOC_CALIBRATE, &calibval);
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if (ret < 0)
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{
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perror("Could not calibrate sensor");
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goto err_out;
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}
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memset(&pfd, 0, sizeof(struct pollfd));
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pfd.fd = fd;
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pfd.events = POLLIN;
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ret = poll(&pfd, 1, -1);
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if (ret < 0)
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{
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perror("Could not poll sensor");
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goto err_out;
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}
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ret = read(fd, &light, sizeof(struct sensor_light));
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if (ret < 0)
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{
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perror("Could not read from sensor");
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goto err_out;
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}
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printf("timestamp: %llu, lux: %f\n", light.timestamp, light.light);
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return OK;
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err_out:
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close(fd);
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return ret;
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}
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