apps/examples/rgbled: Add an example using the RGB LED driver

ChangeLog.txt

@@ -1555,4 +1555,7 @@
 	* apps/examples/leds: An example to demonstrate use of LED
 	  driver (2016-02-20).
 	* apps/examples/smp:  An verifying SMP configurations (2016-02-21).
+	* apps/examples/rgbled:  Example using the RGB LED driver to
+	  drive an RGB LED via PWM.  From Alan Carvalho de Assis
+	  (2016-02-23).
 

examples/Kconfig

@@ -64,6 +64,7 @@ source "$APPSDIR/examples/posix_spawn/Kconfig"
 source "$APPSDIR/examples/qencoder/Kconfig"
 source "$APPSDIR/examples/random/Kconfig"
 source "$APPSDIR/examples/relays/Kconfig"
+source "$APPSDIR/examples/rgbled/Kconfig"
 source "$APPSDIR/examples/rgmp/Kconfig"
 source "$APPSDIR/examples/romfs/Kconfig"
 source "$APPSDIR/examples/sendmail/Kconfig"

examples/README.txt

@@ -1695,6 +1695,12 @@ examples/relays
   NuttX is built as a protected, supervisor kernel (CONFIG_BUILD_PROTECTED
   or CONFIG_BUILD_KERNEL).
 
+examples/rgbled
+^^^^^^^^^^^^^^^
+
+  This example demonstrates the use of the RGB led driver to drive an RGB LED
+  with PWM outputs so that all color characteristcs of RGB LED can be controlled.
+
 examples/rgmp
 ^^^^^^^^^^^^^
 

examples/rgbled/.gitignore

@@ -0,0 +1,11 @@
+/Make.dep
+/.depend
+/.built
+/*.asm
+/*.obj
+/*.rel
+/*.lst
+/*.sym
+/*.adb
+/*.lib
+/*.src

examples/rgbled/Kconfig

@@ -0,0 +1,30 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_RGBLED
+	bool "RGB LED Test"
+	default n
+	---help---
+		Enable the RGB LED example
+
+if EXAMPLES_RGBLED
+
+config EXAMPLES_RGBLED_PROGNAME
+	string "Program name"
+	default "rgbled"
+	depends on BUILD_KERNEL
+	---help---
+		This is the name of the program that will be use when the NSH ELF
+		program is installed.
+
+config EXAMPLES_RGBLED_PRIORITY
+	int "RGBLED task priority"
+	default 100
+
+config EXAMPLES_RGBLED_STACKSIZE
+	int "RGBLED stack size"
+	default 2048
+
+endif # EXAMPLES_RGBLED

examples/rgbled/Make.defs

@@ -0,0 +1,39 @@
+############################################################################
+# apps/examples/rgbled/Make.defs
+# Adds selected applications to apps/ build
+#
+#   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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.
+#
+############################################################################
+
+ifeq ($(CONFIG_EXAMPLES_RGBLED),y)
+CONFIGURED_APPS += examples/rgbled
+endif

examples/rgbled/Makefile

@@ -0,0 +1,56 @@
+############################################################################
+# apps/examples/rgbled/Makefile
+#
+#   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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.
+#
+############################################################################
+
+-include $(TOPDIR)/Make.defs
+
+# RGBLED built-in application info
+
+CONFIG_EXAMPLES_RGBLED_PRIORITY ?= SCHED_PRIORITY_DEFAULT
+CONFIG_EXAMPLES_RGBLED_STACKSIZE ?= 2048
+
+APPNAME = rgbled
+PRIORITY = $(CONFIG_EXAMPLES_RGBLED_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_RGBLED_STACKSIZE)
+
+# RGBLED Example
+
+ASRCS =
+CSRCS =
+MAINSRC = rgbled.c
+
+CONFIG_EXAMPLES_RGBLED_PROGNAME ?= rgbled$(EXEEXT)
+PROGNAME = $(CONFIG_EXAMPLES_RGBLED_PROGNAME)
+
+include $(APPDIR)/Application.mk

examples/rgbled/rgbled.c

@@ -0,0 +1,116 @@
+/****************************************************************************
+ * 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
+ ****************************************************************************/
+
+#define RGBLED "/dev/rgb0"
+
+/****************************************************************************
+ * 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(RGBLED, O_WRONLY);
+
+  if (fd < 0)
+    {
+      printf("Error opening %s!\n", RGBLED);
+      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;
+}