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