| /**************************************************************************** |
| * examples/rgbled/rgbled.c |
| * |
| * Copyright (C) 2016 Gregory Nutt. All rights reserved. |
| * Author: Alan Carvalho de Assis <acassis@gmail.com> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * 3. Neither the name NuttX nor the names of its contributors may be |
| * used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| |
| /**************************************************************************** |
| * Pre-processor Definitions |
| ****************************************************************************/ |
| |
| #ifndef CONFIG_EXAMPLES_RGBLED_DEVNAME |
| # define CONFIG_EXAMPLES_RGBLED_DEVNAME "/dev/rgbled0" |
| #endif |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * rgbled_main |
| ****************************************************************************/ |
| |
| #ifdef CONFIG_BUILD_KERNEL |
| int main(int argc, FAR char *argv[]) |
| #else |
| int rgbled_main(int argc, char *argv[]) |
| #endif |
| { |
| 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; |
| } |
| |
| sprintf(buffer, "#%02X%02X%02X", red, green, blue); |
| (void)write(fd, buffer, 8); |
| usleep(5000); |
| } |
| |
| return 0; |
| } |