SYNQUACER_I2C_REG_DAR
writeb(i2c_8bit_addr_from_msg(pmsg), i2c->base + SYNQUACER_I2C_REG_DAR);
i2c->base + SYNQUACER_I2C_REG_DAR);
byte = readb(i2c->base + SYNQUACER_I2C_REG_DAR);