encodeSK9822()

template<typename InputIterator, typename OutputIterator>

void fl::encodeSK9822	(	InputIterator	first,
		InputIterator	last,
		OutputIterator	out,
		u8	global_brightness = 31 )

Encode pixel data in SK9822 format with global brightness.

Template Parameters

InputIterator	Iterator yielding fl::array<u8, 3> (3 bytes in wire order)
OutputIterator	Output iterator accepting uint8_t

Parameters

first	Iterator to first pixel
last	Iterator past last pixel
out	Output iterator for encoded bytes
global_brightness	Global 5-bit brightness (0-31), default 31

Note

SK9822 uses BGR wire order: pixel[0]=Blue, pixel[1]=Green, pixel[2]=Red

Definition at line 37 of file sk9822.h.

                                                          {
    // Clamp brightness to 5-bit range
    global_brightness = global_brightness & 0x1F;
 
    // Start frame: 4 bytes of 0x00
    *out++ = 0x00;
    *out++ = 0x00;
    *out++ = 0x00;
    *out++ = 0x00;
 
    // LED data: brightness header + BGR (count as we go)
    size_t num_leds = 0;
    while (first != last) {
        const fl::array<u8, BYTES_PER_PIXEL_RGB>& pixel = *first;
        *out++ = 0xE0 | global_brightness;
        *out++ = pixel[0];  // Index 0 (BGR order: Blue)
        *out++ = pixel[1];  // Index 1 (BGR order: Green)
        *out++ = pixel[2];  // Index 2 (BGR order: Red)
        ++first;
        ++num_leds;
    }
 
    // The vendor datasheet requires all ones for the end clocks. These clocks
    // shift the final LED frame through a long cascade; a zero frame is not a
    // substitute because it is itself a valid start-frame pattern.
    size_t end_dwords = (num_leds / 32) + 1;
    for (size_t i = 0; i < end_dwords * 4; i++) {
        *out++ = 0xFF;
    }
}

References FL_NO_EXCEPT.

Referenced by fl::PixelIterator::writeSK9822().

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