Jackson Lv / RGBLED

using PWM to control RGB LED for RedBear Demo

Dependents:   BLENano_Mesh

Fork of ChainableLED by Jackson Lv

ChainableLED.cpp@0:e7513df9d7cb, 2016-04-27 (annotated)

Committer:
Jackson_lv
Date:
Wed Apr 27 09:47:09 2016 +0000
Revision:
0:e7513df9d7cb
BLE Nano RGB Demo with DAP board

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Jackson_lv 0:e7513df9d7cb 1 /*
Jackson_lv 0:e7513df9d7cb 2 * Copyright (C) 2013 Seeed Technology Inc.
Jackson_lv 0:e7513df9d7cb 3 * Copyright (C) 2012 Paulo Marques (pjp.marques@gmail.com)
Jackson_lv 0:e7513df9d7cb 4 *
Jackson_lv 0:e7513df9d7cb 5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
Jackson_lv 0:e7513df9d7cb 6 * this software and associated documentation files (the "Software"), to deal in
Jackson_lv 0:e7513df9d7cb 7 * the Software without restriction, including without limitation the rights to
Jackson_lv 0:e7513df9d7cb 8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
Jackson_lv 0:e7513df9d7cb 9 * the Software, and to permit persons to whom the Software is furnished to do so,
Jackson_lv 0:e7513df9d7cb 10 * subject to the following conditions:
Jackson_lv 0:e7513df9d7cb 11 *
Jackson_lv 0:e7513df9d7cb 12 * The above copyright notice and this permission notice shall be included in all
Jackson_lv 0:e7513df9d7cb 13 * copies or substantial portions of the Software.
Jackson_lv 0:e7513df9d7cb 14 *
Jackson_lv 0:e7513df9d7cb 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Jackson_lv 0:e7513df9d7cb 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
Jackson_lv 0:e7513df9d7cb 17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
Jackson_lv 0:e7513df9d7cb 18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
Jackson_lv 0:e7513df9d7cb 19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
Jackson_lv 0:e7513df9d7cb 20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Jackson_lv 0:e7513df9d7cb 21 */
Jackson_lv 0:e7513df9d7cb 22
Jackson_lv 0:e7513df9d7cb 23 /* Information about the P9813 protocol obtained from:
Jackson_lv 0:e7513df9d7cb 24 * http://www.seeedstudio.com/wiki/index.php?title=Twig_-_Chainable_RGB_LED
Jackson_lv 0:e7513df9d7cb 25 *
Jackson_lv 0:e7513df9d7cb 26 * HSB to RGB routine adapted from:
Jackson_lv 0:e7513df9d7cb 27 * http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
Jackson_lv 0:e7513df9d7cb 28 *
Jackson_lv 0:e7513df9d7cb 29 * This library is ported from Arduino to mbed
Jackson_lv 0:e7513df9d7cb 30 */
Jackson_lv 0:e7513df9d7cb 31
Jackson_lv 0:e7513df9d7cb 32
Jackson_lv 0:e7513df9d7cb 33 // --------------------------------------------------------------------------------------
Jackson_lv 0:e7513df9d7cb 34
Jackson_lv 0:e7513df9d7cb 35 #include "ChainableLED.h"
Jackson_lv 0:e7513df9d7cb 36
Jackson_lv 0:e7513df9d7cb 37 // Forward declaration
Jackson_lv 0:e7513df9d7cb 38 float hue2rgb(float p, float q, float t);
Jackson_lv 0:e7513df9d7cb 39
Jackson_lv 0:e7513df9d7cb 40 // --------------------------------------------------------------------------------------
Jackson_lv 0:e7513df9d7cb 41
Jackson_lv 0:e7513df9d7cb 42 ChainableLED::ChainableLED(PinName clk_pin, PinName data_pin, unsigned int number_of_leds) :
Jackson_lv 0:e7513df9d7cb 43 _clk_pin(clk_pin), _data_pin(data_pin)
Jackson_lv 0:e7513df9d7cb 44 {
Jackson_lv 0:e7513df9d7cb 45 _num_leds = number_of_leds;
Jackson_lv 0:e7513df9d7cb 46
Jackson_lv 0:e7513df9d7cb 47 for (uint8_t i=0; i<_num_leds; i++)
Jackson_lv 0:e7513df9d7cb 48 setColorRGB(i, 0, 0, 0);
Jackson_lv 0:e7513df9d7cb 49 }
Jackson_lv 0:e7513df9d7cb 50
Jackson_lv 0:e7513df9d7cb 51 ChainableLED::~ChainableLED()
Jackson_lv 0:e7513df9d7cb 52 {
Jackson_lv 0:e7513df9d7cb 53 }
Jackson_lv 0:e7513df9d7cb 54
Jackson_lv 0:e7513df9d7cb 55 // --------------------------------------------------------------------------------------
Jackson_lv 0:e7513df9d7cb 56
Jackson_lv 0:e7513df9d7cb 57 void ChainableLED::clk(void)
Jackson_lv 0:e7513df9d7cb 58 {
Jackson_lv 0:e7513df9d7cb 59 _clk_pin = 0;
Jackson_lv 0:e7513df9d7cb 60 wait_us(_CLK_PULSE_DELAY);
Jackson_lv 0:e7513df9d7cb 61 _clk_pin = 1;
Jackson_lv 0:e7513df9d7cb 62 wait_us(_CLK_PULSE_DELAY);
Jackson_lv 0:e7513df9d7cb 63 }
Jackson_lv 0:e7513df9d7cb 64
Jackson_lv 0:e7513df9d7cb 65 void ChainableLED::sendByte(uint8_t b)
Jackson_lv 0:e7513df9d7cb 66 {
Jackson_lv 0:e7513df9d7cb 67 // Send one bit at a time, starting with the MSB
Jackson_lv 0:e7513df9d7cb 68 for (uint8_t i=0; i<8; i++)
Jackson_lv 0:e7513df9d7cb 69 {
Jackson_lv 0:e7513df9d7cb 70 // If MSB is 1, write one and clock it, else write 0 and clock
Jackson_lv 0:e7513df9d7cb 71 if ((b & 0x80) != 0)
Jackson_lv 0:e7513df9d7cb 72 _data_pin = 1;
Jackson_lv 0:e7513df9d7cb 73 else
Jackson_lv 0:e7513df9d7cb 74 _data_pin = 0;
Jackson_lv 0:e7513df9d7cb 75
Jackson_lv 0:e7513df9d7cb 76 clk();
Jackson_lv 0:e7513df9d7cb 77
Jackson_lv 0:e7513df9d7cb 78 // Advance to the next bit to send
Jackson_lv 0:e7513df9d7cb 79 b <<= 1;
Jackson_lv 0:e7513df9d7cb 80 }
Jackson_lv 0:e7513df9d7cb 81 }
Jackson_lv 0:e7513df9d7cb 82
Jackson_lv 0:e7513df9d7cb 83 void ChainableLED::sendColor(uint8_t red, uint8_t green, uint8_t blue)
Jackson_lv 0:e7513df9d7cb 84 {
Jackson_lv 0:e7513df9d7cb 85 // Start by sending a uint8_t with the format "1 1 /B7 /B6 /G7 /G6 /R7 /R6"
Jackson_lv 0:e7513df9d7cb 86 uint8_t prefix = 0xC0;
Jackson_lv 0:e7513df9d7cb 87 if ((blue & 0x80) == 0) prefix|= 0x20;
Jackson_lv 0:e7513df9d7cb 88 if ((blue & 0x40) == 0) prefix|= 0x10;
Jackson_lv 0:e7513df9d7cb 89 if ((green & 0x80) == 0) prefix|= 0x08;
Jackson_lv 0:e7513df9d7cb 90 if ((green & 0x40) == 0) prefix|= 0x04;
Jackson_lv 0:e7513df9d7cb 91 if ((red & 0x80) == 0) prefix|= 0x02;
Jackson_lv 0:e7513df9d7cb 92 if ((red & 0x40) == 0) prefix|= 0x01;
Jackson_lv 0:e7513df9d7cb 93 sendByte(prefix);
Jackson_lv 0:e7513df9d7cb 94
Jackson_lv 0:e7513df9d7cb 95 // Now must send the 3 colors
Jackson_lv 0:e7513df9d7cb 96 sendByte(blue);
Jackson_lv 0:e7513df9d7cb 97 sendByte(green);
Jackson_lv 0:e7513df9d7cb 98 sendByte(red);
Jackson_lv 0:e7513df9d7cb 99 }
Jackson_lv 0:e7513df9d7cb 100
Jackson_lv 0:e7513df9d7cb 101 void ChainableLED::setColorRGB(unsigned int led, uint8_t red, uint8_t green, uint8_t blue)
Jackson_lv 0:e7513df9d7cb 102 {
Jackson_lv 0:e7513df9d7cb 103 // Send data frame prefix (32x "0")
Jackson_lv 0:e7513df9d7cb 104 sendByte(0x00);
Jackson_lv 0:e7513df9d7cb 105 sendByte(0x00);
Jackson_lv 0:e7513df9d7cb 106 sendByte(0x00);
Jackson_lv 0:e7513df9d7cb 107 sendByte(0x00);
Jackson_lv 0:e7513df9d7cb 108
Jackson_lv 0:e7513df9d7cb 109 // Send color data for each one of the leds
Jackson_lv 0:e7513df9d7cb 110 for (uint8_t i=0; i<_num_leds; i++)
Jackson_lv 0:e7513df9d7cb 111 {
Jackson_lv 0:e7513df9d7cb 112 if (i == led)
Jackson_lv 0:e7513df9d7cb 113 {
Jackson_lv 0:e7513df9d7cb 114 _led_state[i*3 + _CL_RED] = red;
Jackson_lv 0:e7513df9d7cb 115 _led_state[i*3 + _CL_GREEN] = green;
Jackson_lv 0:e7513df9d7cb 116 _led_state[i*3 + _CL_BLUE] = blue;
Jackson_lv 0:e7513df9d7cb 117 }
Jackson_lv 0:e7513df9d7cb 118
Jackson_lv 0:e7513df9d7cb 119 sendColor(_led_state[i*3 + _CL_RED],
Jackson_lv 0:e7513df9d7cb 120 _led_state[i*3 + _CL_GREEN],
Jackson_lv 0:e7513df9d7cb 121 _led_state[i*3 + _CL_BLUE]);
Jackson_lv 0:e7513df9d7cb 122 }
Jackson_lv 0:e7513df9d7cb 123
Jackson_lv 0:e7513df9d7cb 124 // Terminate data frame (32x "0")
Jackson_lv 0:e7513df9d7cb 125 sendByte(0x00);
Jackson_lv 0:e7513df9d7cb 126 sendByte(0x00);
Jackson_lv 0:e7513df9d7cb 127 sendByte(0x00);
Jackson_lv 0:e7513df9d7cb 128 sendByte(0x00);
Jackson_lv 0:e7513df9d7cb 129 }
Jackson_lv 0:e7513df9d7cb 130
Jackson_lv 0:e7513df9d7cb 131 void ChainableLED::setColorHSB(unsigned int led, float hue, float saturation, float brightness)
Jackson_lv 0:e7513df9d7cb 132 {
Jackson_lv 0:e7513df9d7cb 133 float r, g, b;
Jackson_lv 0:e7513df9d7cb 134
Jackson_lv 0:e7513df9d7cb 135 // constrain(hue, 0.0, 1.0);
Jackson_lv 0:e7513df9d7cb 136 // constrain(saturation, 0.0, 1.0);
Jackson_lv 0:e7513df9d7cb 137 // constrain(brightness, 0.0, 1.0);
Jackson_lv 0:e7513df9d7cb 138
Jackson_lv 0:e7513df9d7cb 139 if(saturation == 0.0)
Jackson_lv 0:e7513df9d7cb 140 {
Jackson_lv 0:e7513df9d7cb 141 r = g = b = brightness;
Jackson_lv 0:e7513df9d7cb 142 }
Jackson_lv 0:e7513df9d7cb 143 else
Jackson_lv 0:e7513df9d7cb 144 {
Jackson_lv 0:e7513df9d7cb 145 float q = brightness < 0.5 ?
Jackson_lv 0:e7513df9d7cb 146 brightness * (1.0 + saturation) : brightness + saturation - brightness * saturation;
Jackson_lv 0:e7513df9d7cb 147 float p = 2.0 * brightness - q;
Jackson_lv 0:e7513df9d7cb 148 r = hue2rgb(p, q, hue + 1.0/3.0);
Jackson_lv 0:e7513df9d7cb 149 g = hue2rgb(p, q, hue);
Jackson_lv 0:e7513df9d7cb 150 b = hue2rgb(p, q, hue - 1.0/3.0);
Jackson_lv 0:e7513df9d7cb 151 }
Jackson_lv 0:e7513df9d7cb 152
Jackson_lv 0:e7513df9d7cb 153 setColorRGB(led, (uint8_t)(255.0*r), (uint8_t)(255.0*g), (uint8_t)(255.0*b));
Jackson_lv 0:e7513df9d7cb 154 }
Jackson_lv 0:e7513df9d7cb 155
Jackson_lv 0:e7513df9d7cb 156 // --------------------------------------------------------------------------------------
Jackson_lv 0:e7513df9d7cb 157
Jackson_lv 0:e7513df9d7cb 158 float hue2rgb(float p, float q, float t)
Jackson_lv 0:e7513df9d7cb 159 {
Jackson_lv 0:e7513df9d7cb 160 if (t < 0.0)
Jackson_lv 0:e7513df9d7cb 161 t += 1.0;
Jackson_lv 0:e7513df9d7cb 162 if(t > 1.0)
Jackson_lv 0:e7513df9d7cb 163 t -= 1.0;
Jackson_lv 0:e7513df9d7cb 164 if(t < 1.0/6.0)
Jackson_lv 0:e7513df9d7cb 165 return p + (q - p) * 6.0 * t;
Jackson_lv 0:e7513df9d7cb 166 if(t < 1.0/2.0)
Jackson_lv 0:e7513df9d7cb 167 return q;
Jackson_lv 0:e7513df9d7cb 168 if(t < 2.0/3.0)
Jackson_lv 0:e7513df9d7cb 169 return p + (q - p) * (2.0/3.0 - t) * 6.0;
Jackson_lv 0:e7513df9d7cb 170
Jackson_lv 0:e7513df9d7cb 171 return p;
Jackson_lv 0:e7513df9d7cb 172 }