Diff: ChainableLED.cpp

Revision:

0:22cae1dee34b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ChainableLED.cpp	Mon Apr 11 04:19:53 2016 +0000
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2013 Seeed Technology Inc.
+ * Copyright (C) 2012 Paulo Marques (pjp.marques@gmail.com)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of 
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all 
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/* Information about the P9813 protocol obtained from:
+ * http://www.seeedstudio.com/wiki/index.php?title=Twig_-_Chainable_RGB_LED
+ *
+ * HSB to RGB routine adapted from:
+ * http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
+ *
+ * This library is ported from Arduino to mbed
+ */
+
+
+// --------------------------------------------------------------------------------------
+
+#include "ChainableLED.h"
+
+// Forward declaration
+float hue2rgb(float p, float q, float t);
+PwmOut          PWMR(P0_11);
+PwmOut          PWMG(P0_9);
+PwmOut          PWMB(P0_10);
+// --------------------------------------------------------------------------------------
+
+ChainableLED::ChainableLED(PinName r_pin, PinName g_pin, PinName b_pin,unsigned int number_of_leds) :
+    _r_pin(r_pin), _g_pin(g_pin),_b_pin(b_pin)
+{
+    _num_leds = number_of_leds;
+    
+
+    for (uint8_t i=0; i<_num_leds; i++)
+        setColorRGB(i, 0, 0, 0);
+}
+
+ChainableLED::~ChainableLED()
+{
+}
+
+// --------------------------------------------------------------------------------------
+
+
+ 
+void ChainableLED::sendColor(uint8_t red, uint8_t green, uint8_t blue)
+{
+    //control the RGB LED by PWM
+    PWMR = (float)red/255;
+    PWMG = (float)green/255;
+    PWMB = (float)blue/255;
+    
+}
+
+void ChainableLED::setColorRGB(unsigned int led, float red, float green, float blue)
+{
+    sendColor(0xff-red, 0xff-green, 0xff-blue );    
+}
+
+void ChainableLED::setColorHSB(unsigned int led, float hue, float saturation, float brightness)
+{
+    float r, g, b;
+    
+    if(saturation == 0.0)
+    {
+        r = g = b = brightness;
+    }
+    else
+    {
+        float q = brightness < 0.5 ? 
+            brightness * (1.0 + saturation) : brightness + saturation - brightness * saturation;
+        float p = 2.0 * brightness - q;
+        r = hue2rgb(p, q, hue + 1.0/3.0);
+        g = hue2rgb(p, q, hue);
+        b = hue2rgb(p, q, hue - 1.0/3.0);
+    }
+
+    setColorRGB(led, (uint8_t)(255.0*r), (uint8_t)(255.0*g), (uint8_t)(255.0*b));
+}
+
+// --------------------------------------------------------------------------------------
+
+float hue2rgb(float p, float q, float t)
+{
+    if (t < 0.0) 
+        t += 1.0;
+    if(t > 1.0) 
+        t -= 1.0;
+    if(t < 1.0/6.0) 
+        return p + (q - p) * 6.0 * t;
+    if(t < 1.0/2.0) 
+        return q;
+    if(t < 2.0/3.0) 
+        return p + (q - p) * (2.0/3.0 - t) * 6.0;
+
+    return p;
+}