OCI2C_CTRL_IEN
oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~OCI2C_CTRL_IEN);
oc_setreg(i2c, OCI2C_CONTROL, ctrl | OCI2C_CTRL_IEN);
ctrl &= ~(OCI2C_CTRL_EN | OCI2C_CTRL_IEN);
ctrl &= ~(OCI2C_CTRL_EN | OCI2C_CTRL_IEN);
ctrl &= ~(OCI2C_CTRL_EN | OCI2C_CTRL_IEN);