RX_DONE_HIGH_INT_MASK
rx_intr2 = intr[2] & RX_DONE_HIGH_INT_MASK;
#define RX_DONE_HIGH_OFFSET fls(RX_DONE_HIGH_INT_MASK)
((RX_DONE_HIGH_INT_MASK << RX_DONE_HIGH_OFFSET) | RX_DONE_LOW_INT_MASK)
(((_n) >> RX_DONE_HIGH_OFFSET) & RX_DONE_HIGH_INT_MASK))