176 lines
5.2 KiB
C++
176 lines
5.2 KiB
C++
/*
|
|
* 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
|
|
*/
|
|
|
|
|
|
// --------------------------------------------------------------------------------------
|
|
|
|
#include "ChainableLED.h"
|
|
|
|
// Forward declaration
|
|
float hue2rgb(float p, float q, float t);
|
|
|
|
// --------------------------------------------------------------------------------------
|
|
|
|
ChainableLED::ChainableLED(byte clk_pin, byte data_pin, byte number_of_leds) :
|
|
_clk_pin(clk_pin), _data_pin(data_pin), _num_leds(number_of_leds)
|
|
{
|
|
_led_state = (byte*) calloc(_num_leds*3, sizeof(byte));
|
|
}
|
|
|
|
ChainableLED::~ChainableLED()
|
|
{
|
|
free(_led_state);
|
|
}
|
|
|
|
// --------------------------------------------------------------------------------------
|
|
|
|
void ChainableLED::init()
|
|
{
|
|
pinMode(_clk_pin, OUTPUT);
|
|
pinMode(_data_pin, OUTPUT);
|
|
|
|
for (byte i=0; i<_num_leds; i++)
|
|
setColorRGB(i, 0, 0, 0);
|
|
}
|
|
|
|
void ChainableLED::clk(void)
|
|
{
|
|
digitalWrite(_clk_pin, LOW);
|
|
delayMicroseconds(_CLK_PULSE_DELAY);
|
|
digitalWrite(_clk_pin, HIGH);
|
|
delayMicroseconds(_CLK_PULSE_DELAY);
|
|
}
|
|
|
|
void ChainableLED::sendByte(byte b)
|
|
{
|
|
// Send one bit at a time, starting with the MSB
|
|
for (byte i=0; i<8; i++)
|
|
{
|
|
// If MSB is 1, write one and clock it, else write 0 and clock
|
|
if ((b & 0x80) != 0)
|
|
digitalWrite(_data_pin, HIGH);
|
|
else
|
|
digitalWrite(_data_pin, LOW);
|
|
clk();
|
|
|
|
// Advance to the next bit to send
|
|
b <<= 1;
|
|
}
|
|
}
|
|
|
|
void ChainableLED::sendColor(byte red, byte green, byte blue)
|
|
{
|
|
// Start by sending a byte with the format "1 1 /B7 /B6 /G7 /G6 /R7 /R6"
|
|
byte prefix = 0b11000000;
|
|
if ((blue & 0x80) == 0) prefix|= 0b00100000;
|
|
if ((blue & 0x40) == 0) prefix|= 0b00010000;
|
|
if ((green & 0x80) == 0) prefix|= 0b00001000;
|
|
if ((green & 0x40) == 0) prefix|= 0b00000100;
|
|
if ((red & 0x80) == 0) prefix|= 0b00000010;
|
|
if ((red & 0x40) == 0) prefix|= 0b00000001;
|
|
sendByte(prefix);
|
|
|
|
// Now must send the 3 colors
|
|
sendByte(blue);
|
|
sendByte(green);
|
|
sendByte(red);
|
|
}
|
|
|
|
void ChainableLED::setColorRGB(byte led, byte red, byte green, byte 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 (byte 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(byte led, float hue, float saturation, float brightness)
|
|
{
|
|
float r, g, b;
|
|
|
|
hue=constrain(hue, 0.0, 1.0);
|
|
saturation=constrain(saturation, 0.0, 1.0);
|
|
brightness=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, (byte)(255.0*r), (byte)(255.0*g), (byte)(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;
|
|
}
|