WS2812B RGB - Fade Color

digital32

I'm trying to fade from one color to another with a WS2812B RGB strip.
Working in the Simple IDE compiler so if possible I need it in C Code.
I can turn the RGBs on/off/set the colors... Now I want to fade from one color to another.
Anyone got some C code to smoothly fade from one color to another?

Looking for a procedure like this:
void Color_Fade(long _Start_Color, long _End_Color, int speedMS)

Here is example declarations for the color that I found in the Elev-8 flight controller.

// WS2812B RGB LED Module Variable Definitions
const int Extra_LED_Module_Count = 8; // Extra WS2812B RGB LED Module Count (Do not count the onboard WS2812B Module)
const int LED_COUNT = Extra_LED_Module_Count + 1; // + Onboard WS2812B
static long LEDValue[LED_COUNT]; // LED Outputs (Copied to the LEDs by the Sensors cog)
static long LEDModeColor; // Used to Set the LED Mode Color
const int FC_LED_Module = 0; // Flight Controller WS2812B RBG LED Module Index

//LED Brightness values - AND with color values to dim them
const int LED_Full = 0xffffff;
const int LED_Half = 0x7f7f7f;
const int LED_Quarter = 0x3f3f3f;
const int LED_Eighth = 0x1f1f1f;
const int LED_Dim = 0x0f0f0f;

//LED Color values
const int LED_Off = 0x000000;
const int LED_Red = 0x00FF00;
const int LED_Green = 0xFF0000;
const int LED_Blue = 0x0000FF;
const int LED_White = 0xFFFFFF;
const int LED_Yellow = LED_Red | LED_Green;
const int LED_Violet = LED_Red | LED_Blue;
const int LED_Cyan = LED_Blue | LED_Green;
const int LED_DimCyan = (LED_Blue | LED_Green) & LED_Half;
const int LED_DimWhite = LED_White & LED_Half;

// Used to attenuate the brightness of the LEDs, if desired. A shift of zero is full brightness
const int LEDBrightShift = 0;
const int LEDSingleMask = 0xFF - ((1<<LEDBrightShift)-1);
const int LEDBrightMask = LEDSingleMask | (LEDSingleMask << 8) | (LEDSingleMask << 16);

RS_Jim

Refer to this in the Propellar forum.
https://forums.parallax.com/post/quote/168435/Discussion_168435
It will be in Spin but ther is conversion software to make it "C"
Jim

iseries

While this is not the same setup you have the values returned by this C code should be valid.

This code is for individual RED, GREEN, and BLUE LED.

How to use a RGB LED

Mike

JonnyMac

I only use C when I'm forced to use the Schmarschmino, so I tested this code -- which are converted from methods in my advanced pixel library -- in the Arduino compiler.

The morph() function will let you transition from one color to another. Put this into a timed loop.

uint32_t color(uint8_t r, uint8_t g, uint8_t b, uint8_t w)
{
  return (r << 24) | (g << 16) | (b << 8) | w;
}

uint32_t scale_rgbw(uint32_t rgbw, uint8_t level)
{
  if (level == 0) {
    return 0x00000000;
  }
  else if (level == 255) {
    return rgbw;
  }
  else {
    uint8_t r = ((rgbw >> 24) & 0xFF) * level / 255;
    uint8_t g = ((rgbw >> 16) & 0xFF) * level / 255;
    uint8_t b = ((rgbw >>  8) & 0xFF) * level / 255;
    uint8_t w = ((rgbw) & 0xFF)       * level / 255;
    return color(r, g, b, w);
  }
}

uint32_t morph(uint32_t c1, uint32_t c2, uint8_t phase)
{
  if (phase == 0) {
    return c1;
  }
  else if (phase == 255) {
    return c2;
  }
  else {
    c1 = scale_rgbw(c1, phase);
    c2 = scale_rgbw(c2, 255-phase);
    return c1 + c2;
  }
}