pub type BL_W<'a> = FieldWriterSafe<'a, u32, MACCR_SPEC, u8, BL_A, 2, 5>;
Field BL writer - Back-off limit
BL
For retransmission n, wait up to 2^min(n, 10) time slots
For retransmission n, wait up to 2^min(n, 8) time slots
For retransmission n, wait up to 2^min(n, 4) time slots
For retransmission n, wait up to 2^min(n, 1) time slots