h6. [[GPIO]] h6(. » [[GPIO SWI Calls|SWI Calls]] h6((. » GPIO_ReadData h2. GPIO_ReadData h5. (SWI &58F80) |_<^. Entry | | |<^. R0 |<^. Logical GPIO pin number | |_<^. Exit | |<. R0 = 0 if pin low, 1 if pin high| h4. Use Reads the state of the given GPIO pin, or returns an error if the pin number is not valid.