ws2812b效果研究之三 ColorTemperature

对应于arduino中的fastled库中的ColorTemperature例子，没啥好说的，也没啥算法，简单就可以理解。
例子一段时间显示A色温，然后黑一段，再显示B色温，通过第一个led的颜色来标识当前是什么色温。当然里面的fill_rainbow函数值得分析，稍后移植到stm32的时候会进行分析。

/// @file    ColorTemperature.ino
/// @brief   Demonstrates how to use @ref ColorTemperature based color correction
/// @example ColorTemperature.ino

#include <FastLED.h>

#define LED_PIN     2

// Information about the LED strip itself
#define NUM_LEDS    108
#define CHIPSET     WS2812B
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];

#define BRIGHTNESS  128


// FastLED provides two color-management controls:
//   (1) color correction settings for each LED strip, and
//   (2) master control of the overall output 'color temperature' 
//
// THIS EXAMPLE demonstrates the second, "color temperature" control.
// It shows a simple rainbow animation first with one temperature profile,
// and a few seconds later, with a different temp