buildWave8ByteExpansionLUT()

Wave8ByteExpansionLut fl::buildWave8ByteExpansionLUT

(

const Wave8BitExpansionLut &

nibble

)

Build a byte-indexed expansion LUT (#2526) from the nibble LUT.

Entry b is the concatenation of the high-nibble expansion (symbols[0..3]) and the low-nibble expansion (symbols[4..7]) — bit-identical to what wave8_convert_byte_to_wave8byte() produces. Not for ISR use.

Definition at line 313 of file wave8.cpp.hpp.

                                                                                     {
    Wave8ByteExpansionLut out;
    for (int b = 0; b < 256; ++b) {
        const Wave8Bit *hi = nibble.lut[(b >> 4) & 0xF];
        const Wave8Bit *lo = nibble.lut[b & 0xF];
        for (int i = 0; i < 4; ++i) {
            out.lut[b].symbols[i] = hi[i];
            out.lut[b].symbols[i + 4] = lo[i];
        }
    }
    return out;
}