MXS_I2C_CTRL0_RETAIN_CLOCK
start |= MXS_I2C_CTRL0_RETAIN_CLOCK;
start &= ~MXS_I2C_CTRL0_RETAIN_CLOCK;
start & MXS_I2C_CTRL0_RETAIN_CLOCK ? "C" : "");
#define MXS_CMD_I2C_SELECT (MXS_I2C_CTRL0_RETAIN_CLOCK | \