LLC_S_PF_BIT_MASK
#define LLC_S_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_S_PF_BIT_MASK)) ? 1 : 0)
#define LLC_S_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_S_PF_BIT_MASK) ? 1 : 0)
pdu->ctrl_2 |= p_bit & LLC_S_PF_BIT_MASK;
pdu->ctrl_2 |= p_bit & LLC_S_PF_BIT_MASK;
pdu->ctrl_2 = p_bit & LLC_S_PF_BIT_MASK;
pdu->ctrl_2 |= f_bit & LLC_S_PF_BIT_MASK;
pdu->ctrl_2 |= f_bit & LLC_S_PF_BIT_MASK;
pdu->ctrl_2 |= f_bit & LLC_S_PF_BIT_MASK;
pf_bit = pdu->ctrl_2 & LLC_S_PF_BIT_MASK;
*pf_bit = pdu->ctrl_2 & LLC_S_PF_BIT_MASK;