h6. [[Hardware Abstraction Layer]] h6(. » [[List of HAL APIs]] h6((. » HAL USB API h4. Entry points Items marked ¶ are internal calls for OS use only; their functionality and availability is subject to change without warning. User programs interested in using these calls should instead use the equivalent RISC OS SWI call (if available). * [[HAL_USBControllerInfo]] ¶ * [[HAL_USBPortPower]] ¶ * [[HAL_USBPortIRQStatus]] ¶ * [[HAL_USBPortIRQClear]] ¶ * [[HAL_USBPortDevice]] ¶