ACPM_PROTOCOL_SEQNUM
rx_seqnum = FIELD_GET(ACPM_PROTOCOL_SEQNUM, rx_data->cmd[0]);
tx_seqnum = FIELD_GET(ACPM_PROTOCOL_SEQNUM, xfer->txd[0]);
rx_seqnum = FIELD_GET(ACPM_PROTOCOL_SEQNUM, val);
seqnum = FIELD_GET(ACPM_PROTOCOL_SEQNUM, xfer->txd[0]);
txd[0] |= FIELD_PREP(ACPM_PROTOCOL_SEQNUM, achan->seqnum);