RIIC_ICDRR
riic_readb(riic, RIIC_ICDRR); /* dummy read */
riic_readb(riic, RIIC_ICDRR); /* dummy read */
*riic->buf = riic_readb(riic, RIIC_ICDRR);
[RIIC_ICDRR] = 0x40,
[RIIC_ICDRR] = 0x13,