102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/****************************************************************************
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* apps/examples/rgbled/rgbled.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 <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_EXAMPLES_RGBLED_DEVNAME
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# define CONFIG_EXAMPLES_RGBLED_DEVNAME "/dev/rgbled0"
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* rgbled_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 red = 255;
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int green = 0;
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int blue = 0;
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int sred = -1;
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int sgreen = 1;
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int sblue = 0;
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int fd;
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char buffer[8];
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fd = open(CONFIG_EXAMPLES_RGBLED_DEVNAME, O_WRONLY);
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if (fd < 0)
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{
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printf("Error opening %s!\n", CONFIG_EXAMPLES_RGBLED_DEVNAME);
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return -1;
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}
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while (1)
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{
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red += sred;
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green += sgreen;
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blue += sblue;
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if (green == 255)
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{
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sred = 0;
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sgreen = -1;
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sblue = 1;
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}
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if (blue == 255)
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{
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sred = 1;
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sgreen = 0;
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sblue = -1;
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}
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if (red == 255)
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{
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sred = -1;
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sblue = 0;
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sgreen = 1;
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}
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snprintf(buffer, sizeof(buffer), "#%02X%02X%02X", red, green, blue);
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write(fd, buffer, 8);
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usleep(5000);
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}
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return 0;
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}
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