si21_readregs
status |= si21_readregs(state, LNB_CTRL_STATUS_REG, &lnb_status, 0x01);
status |= si21_readregs(state, LNB_CTRL_REG_1, &lnb_status, 0x01);
si21_readregs(state, LOCK_STATUS_REG_1, regs_read, 0x02);
status |= si21_readregs(state, ACQ_CTRL_REG_2, ®, 0x01);
si21_readregs(state, SYSTEM_MODE_REG, ®data, 0x01);