I2C_IRQSTATUS_RRDY
mask |= I2C_IRQSTATUS_RDR | I2C_IRQSTATUS_RRDY;
} else if (stat & I2C_IRQSTATUS_RRDY) {
while ((v = I2C_READ_REG(sc, I2C_IRQSTATUS_RAW)) & I2C_IRQSTATUS_RRDY) {