Method writeByte

src/fl/system/pins.h:46–51

Write a single bitmask byte to the 8 pins. Same as write() but optimized for the single-byte case in timing-critical hot loops (clockless bit-banging). Avoids span iteration overhead — inlines directly to two nibble LUT lookups.

    /// timing-critical hot loops (clockless bit-banging). Avoids span
    /// iteration overhead — inlines directly to two nibble LUT lookups.
    void writeByte(u8 byte) const {
        const u8 lo_nib = byte & 0x0F;
        const u8 hi_nib = (byte >> 4) & 0x0F;
        applyNibble(mSetLo[lo_nib], mClrLo[lo_nib]);
        applyNibble(mSetHi[hi_nib], mClrHi[hi_nib]);
    }

    /// Check whether all active pins (non -1) share the same GPIO port.
    /// Returns true if fewer than 2 active pins exist (trivially same port).