GPIOCR
uint32_t gpiocr = bus_space_read_4(bst, bsh, GPIOCR);
bus_space_write_4(bst, bsh, GPIOCR, gpiocr);
uint32_t gpiocr = bus_space_read_4(bst, bsh, GPIOCR);
bus_space_write_4(bst, bsh, GPIOCR, gpiocr);