pub const PTP_OFFSET_NS: i64 = -1_234_567;Expand description
Value latched into REG_PTP_OFFSET_LATCHED: the slave leading the master
by 1 234 567 ns. Stored as the two’s-complement bit pattern a camera would
put on the wire, so the test asserts the bytes and the decoded value
separately rather than round-tripping through our own codec.