canUseWave3()

FL_OPTIMIZE_FUNCTION bool fl::canUseWave3

(

const ChipsetTiming &

timing

)

Check if a chipset timing is eligible for wave3 encoding.

Wave3 requires that normalized T0H and T1H round to exactly 1 and 2 ticks (or 2 and 1) out of 3, and both are in [1,2].

Parameters

timing

ChipsetTiming struct with T1, T2, T3 in nanoseconds

Returns

true if wave3 encoding is possible for this chipset

Definition at line 25 of file wave3.cpp.hpp.

                                              {
    const u32 period = timing.T1 + timing.T2 + timing.T3;
    if (period == 0) {
        return false;
    }
 
    // T0H = T1, T1H = T1 + T2
    const float t0h_norm = static_cast<float>(timing.T1) / period;
    const float t1h_norm = static_cast<float>(timing.T1 + timing.T2) / period;
 
    // Round to nearest integer tick count out of 3
    u32 ticks_bit0 = static_cast<u32>(t0h_norm * 3.0f + 0.5f);
    u32 ticks_bit1 = static_cast<u32>(t1h_norm * 3.0f + 0.5f);
 
    // Both must be in [1, 2] (need at least 1 high tick and 1 low tick)
    if (ticks_bit0 < 1 || ticks_bit0 > 2) return false;
    if (ticks_bit1 < 1 || ticks_bit1 > 2) return false;
 
    // Must be different (one is 1-tick, other is 2-tick)
    if (ticks_bit0 == ticks_bit1) return false;
 
    return true;
}

References fl::ChipsetTiming::T1, fl::ChipsetTiming::T2, and fl::ChipsetTiming::T3.

Referenced by capture().

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