1.8.4. I/O Manager

The I/O-Manager is the central component for managing all I/O-drivers and providing the access to the I/O-configuration. The name of the component is CmpIoMgr and the interface is named “.

IO data consistency is realized in the generic part of the CmpIoMgr component. Thus it is not necessary that each IO driver separately takes care of this. If there is an active IO data exchange for reading inputs, writing outputs, or starting bus cycle on an IO-driver instance, each part will be protected against getting called from any other. This protection is done by a processor atomic bit operation and not via a semaphore and thus is a non-blocking operation.

An I/O driver must register its instance after creating at the I/O-Manager. Therefore, two functions of the interface must be used:

RTS_HANDLE IoMgrRegisterInstance(Ibase *pIBase, , RTS_RESULT *pResult):

This function should be used to register your I/O driver instance. Therefore the Ibase pointer must be transmitted to the I/O-Manager.

A handle to the internal management entry is returned. This handle can be used to remove the instance from the I/O-Manager.

RTS_RESULT IoMgrUnregisterInstance(Ibase *pIBase):

This function is used to deregister the I/O driver instance from the I/O-Manager.