pub fn decode_issy_long(bytes: [u8; 3]) -> Option<Issy>Expand description
Decode a 3-byte (long) ISSY field.
Byte 0 bit 7 must be 1 (long form). Byte 0 bit 6 then selects: 0 → 22-bit
ISCR long; 1 → BUFS/TTO signalling. Returns None if bit 7 is 0 (that is
a short-form field — use decode_issy_short).