ACKPEEK_HEAD_INVALID
ldcp->rx_ack_head = ACKPEEK_HEAD_INVALID;
ldcp->rx_ack_head = ACKPEEK_HEAD_INVALID;
if (ldcp->rx_ack_head == ACKPEEK_HEAD_INVALID)
ldcp->rx_ack_head = ACKPEEK_HEAD_INVALID;
ldcp->rx_ack_head = ACKPEEK_HEAD_INVALID;