GROVE ChainableLED LIBRARY

Dependents:   BLENano_RGB_Demo BLENano_RGB_Demo_DAP ble-devicelink-example connected-lights

Files at this revision

API Documentation at this revision

Comitter:
Jackson_lv
Date:
Wed Apr 27 09:47:09 2016 +0000
Commit message:
BLE Nano RGB Demo with DAP board

Changed in this revision

ChainableLED.cpp Show annotated file Show diff for this revision Revisions of this file
ChainableLED.h Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r e7513df9d7cb ChainableLED.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ChainableLED.cpp	Wed Apr 27 09:47:09 2016 +0000
@@ -0,0 +1,172 @@
+/*
+ * 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);
+
+// --------------------------------------------------------------------------------------
+
+ChainableLED::ChainableLED(PinName clk_pin, PinName data_pin, unsigned int number_of_leds) :
+    _clk_pin(clk_pin), _data_pin(data_pin)
+{
+    _num_leds = number_of_leds;
+    
+    for (uint8_t i=0; i<_num_leds; i++)
+        setColorRGB(i, 0, 0, 0);
+}
+
+ChainableLED::~ChainableLED()
+{
+}
+
+// --------------------------------------------------------------------------------------
+
+void ChainableLED::clk(void)
+{
+    _clk_pin = 0;
+    wait_us(_CLK_PULSE_DELAY);
+    _clk_pin = 1;
+    wait_us(_CLK_PULSE_DELAY);
+}
+
+void ChainableLED::sendByte(uint8_t b)
+{
+    // Send one bit at a time, starting with the MSB
+    for (uint8_t i=0; i<8; i++)
+    {
+        // If MSB is 1, write one and clock it, else write 0 and clock
+        if ((b & 0x80) != 0)
+            _data_pin = 1;
+        else
+            _data_pin = 0;
+            
+        clk();
+
+        // Advance to the next bit to send
+        b <<= 1;
+    }
+}
+ 
+void ChainableLED::sendColor(uint8_t red, uint8_t green, uint8_t blue)
+{
+    // Start by sending a uint8_t with the format "1 1 /B7 /B6 /G7 /G6 /R7 /R6"
+    uint8_t prefix = 0xC0;
+    if ((blue & 0x80) == 0)     prefix|= 0x20;
+    if ((blue & 0x40) == 0)     prefix|= 0x10; 
+    if ((green & 0x80) == 0)    prefix|= 0x08;
+    if ((green & 0x40) == 0)    prefix|= 0x04;
+    if ((red & 0x80) == 0)      prefix|= 0x02;
+    if ((red & 0x40) == 0)      prefix|= 0x01;
+    sendByte(prefix);
+        
+    // Now must send the 3 colors
+    sendByte(blue);
+    sendByte(green);
+    sendByte(red);
+}
+
+void ChainableLED::setColorRGB(unsigned int led, uint8_t red, uint8_t green, uint8_t blue)
+{
+    // Send data frame prefix (32x "0")
+    sendByte(0x00);
+    sendByte(0x00);
+    sendByte(0x00);
+    sendByte(0x00);
+    
+    // Send color data for each one of the leds
+    for (uint8_t i=0; i<_num_leds; i++)
+    {
+        if (i == led)
+        {
+            _led_state[i*3 + _CL_RED] = red;
+            _led_state[i*3 + _CL_GREEN] = green;
+            _led_state[i*3 + _CL_BLUE] = blue;
+        }
+                    
+        sendColor(_led_state[i*3 + _CL_RED], 
+                  _led_state[i*3 + _CL_GREEN], 
+                  _led_state[i*3 + _CL_BLUE]);
+    }
+
+    // Terminate data frame (32x "0")
+    sendByte(0x00);
+    sendByte(0x00);
+    sendByte(0x00);
+    sendByte(0x00);
+}
+
+void ChainableLED::setColorHSB(unsigned int led, float hue, float saturation, float brightness)
+{
+    float r, g, b;
+    
+//     constrain(hue, 0.0, 1.0);
+//     constrain(saturation, 0.0, 1.0);
+//     constrain(brightness, 0.0, 1.0);
+
+    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;
+}
diff -r 000000000000 -r e7513df9d7cb ChainableLED.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ChainableLED.h	Wed Apr 27 09:47:09 2016 +0000
@@ -0,0 +1,64 @@
+/*
+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.
+*/
+
+/* 
+ * Library for controlling a chain of RGB LEDs based on the P9813 protocol.
+ * E.g., supports the Grove Chainable RGB LED product.
+ *
+ * Information about the P9813 protocol obtained from:
+ * http://www.seeedstudio.com/wiki/index.php?title=Twig_-_Chainable_RGB_LED
+ */
+
+
+
+#ifndef __ChainableLED_h__
+#define __ChainableLED_h__
+
+#include "mbed.h"
+
+#define _CL_RED             0
+#define _CL_GREEN           1
+#define _CL_BLUE            2
+#define _CLK_PULSE_DELAY    20
+
+class ChainableLED
+{
+public:
+    ChainableLED(PinName clk_pin, PinName data_pin, unsigned int number_of_leds);
+    ~ChainableLED();
+    
+    void setColorRGB(unsigned int led, uint8_t red, uint8_t green, uint8_t blue);
+    void setColorHSB(unsigned int led, float hue, float saturation, float brightness);
+
+private:
+    DigitalOut _clk_pin;
+    DigitalOut _data_pin;
+    unsigned int _num_leds; 
+
+    uint8_t _led_state[3];
+    
+    void clk(void);
+    void sendByte(uint8_t b);
+    void sendColor(uint8_t red, uint8_t green, uint8_t blue);
+};
+
+#endif