finish()

void fl::channels::rx::Ws2812StreamDecoder::finish

(

const ChipsetTiming4Phase &

timing

)

Re-classify the recorded bits with the decode-time timing and write the partial final byte.

Idempotent; call after flush().

Definition at line 259 of file ws2812_stream_decoder.cpp.hpp.

                                                                               {
    flush();
    mPartialWritten = false;
    mStats.gapBitShift = false;
    if (mBitCount > 0 && mStats.fullBytes < mOut.size()) {
        mOut[mStats.fullBytes] = static_cast<u8>(mCurByte << (8 - mBitCount));
        mPartialWritten = true;
    }
 
    const u32 frame_mid =
        flexPwmAdaptiveMidpointNs(timing, mHighMin, mHighMax, mHighSamples);
    mStats.frameMidpointNs = frame_mid;
    const u32 drift = (frame_mid > mMidpoint) ? frame_mid - mMidpoint : mMidpoint - frame_mid;
    bool inexact = drift > kExceptionBandNs || mStats.exceptionsDropped > 0;
    for (u32 k = 0; k < mExceptionCount; ++k) {
        const Exception& e = mExceptions[k];
        int b;
        if (e.mode == Mode::FromHigh) {
            b = flexPwmBitFromHigh(e.high_ns, timing);
            if ((b >= 0) != e.stream_valid) {
                inexact = true;  // the bit would be dropped / kept instead
                mStats.gapBitShift = true;
                continue;
            }
            if (b < 0) {
                continue;
            }
        } else {
            b = flexPwmBitFromMidpoint(e.high_ns, frame_mid);
        }
        const u32 byte = e.bit_pos / 8u;
        if (byte >= mOut.size()) {
            continue;
        }
        const u8 mask = static_cast<u8>(0x80u >> (e.bit_pos % 8u));
        mOut[byte] = b ? static_cast<u8>(mOut[byte] | mask)
                       : static_cast<u8>(mOut[byte] & ~mask);
    }
    mStats.inexact = inexact;
}

References fl::channels::rx::Ws2812StreamDecoder::Exception::bit_pos, fl::FL_NO_EXCEPT, fl::channels::rx::flexPwmAdaptiveMidpointNs(), fl::channels::rx::flexPwmBitFromHigh(), fl::channels::rx::flexPwmBitFromMidpoint(), fl::flush(), FromHigh, fl::channels::rx::Ws2812StreamDecoder::Exception::high_ns, kExceptionBandNs, mBitCount, mCurByte, mExceptionCount, mExceptions, mHighMax, mHighMin, mHighSamples, mMidpoint, fl::channels::rx::Ws2812StreamDecoder::Exception::mode, mOut, mPartialWritten, mStats, and fl::channels::rx::Ws2812StreamDecoder::Exception::stream_valid.

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