ESA_GPIO_DIRECTION
data = bus_space_read_2(iot, ioh, ESA_GPIO_DIRECTION);
bus_space_write_2(iot, ioh, ESA_GPIO_DIRECTION,
bus_space_write_2(iot, ioh, ESA_GPIO_DIRECTION,
data = bus_space_read_2(iot, ioh, ESA_GPIO_DIRECTION);
bus_space_write_2(iot, ioh, ESA_GPIO_DIRECTION, data | gpo);