From 552ed255f6719450645566ee377e0f17ecb8d8a9 Mon Sep 17 00:00:00 2001
From: Jeff <idiotcatalyst@gmail.com>
Date: Thu, 27 Jul 2017 07:43:59 -0600
Subject: [PATCH] Add support for inverted LEDS.  See common anode RGB LED
 discussion in the Yahoo group

---
 drivers/leds/Kconfig  |  9 +++++++++
 drivers/leds/rgbled.c | 12 +++++++++---
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index edcbb97528..0d7b47e347 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -48,6 +48,15 @@ config RGBLED
                 This selection enables building of the "upper-half" RGB LED driver.
                 See include/nuttx/rgbled.h for further PWM driver information.
 
+config RGBLED_INVERT
+	bool "Invert RGB LED Output"
+	depends on RGBLED
+	default n
+	---help---
+		If the board has a common anode RGB LED (a LOW output turns ON
+		each LED), this selection inverts the outputs so that the
+		colors are displayed correctly.
+
 config PCA9635PW
 	bool "PCA9635PW I2C LED Driver"
 	default n
diff --git a/drivers/leds/rgbled.c b/drivers/leds/rgbled.c
index 81b2ff5591..bb85d3f5e3 100644
--- a/drivers/leds/rgbled.c
+++ b/drivers/leds/rgbled.c
@@ -304,9 +304,15 @@ static ssize_t rgbled_write(FAR struct file *filep, FAR const char *buffer,
 
   /* Convert 8bit to 16bits */
 
-  red   <<= 8;
-  green <<= 8;
-  blue  <<= 8;
+  red   = (red   << 8) | red;
+  green = (green << 8) | green;
+  blue  = (blue  << 8) | blue;
+
+#ifdef CONFIG_RGBLED_INVERT
+  red   ^= 0xffff;
+  green ^= 0xffff;
+  blue  ^= 0xffff;
+#endif
 
   /* Setup LED R */