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with Symbian OS descriptors! The host checks whether it can support the power and bandwidth requirements, and that it has a compatible class driver. It may also have to select the con guration of choice. The host is said to have con gured the device by selecting and accepting a con guration. An interface within a con guration may also have alternative settings that rede ne the number of associated endpoints or the characteristics of these endpoints. In this case the host is also responsible for selecting the appropriate alternate setting. A Symbian OS phone is unlikely to be con gured as a standard USB host because such devices have to be able to supply a high current to power devices attached to the bus. Until now, most Symbian OS phones have been con gured as USB devices and connected to a USB host computer. Classes supported by Symbian OS include the Abstract Control Model (ACM) modem interface this is a subclass of the Communications Device Class (CDC) and provides serial communications over USB. It is used for backup, restore and data synchronization with a desktop computer. Another class Symbian OS supports is the Mass Storage class, which allows direct access to certain drives on the phone from the host computer. We expect that Symbian OS OTG devices will be produced in the near future. These will be able to be used as host computers, interfacing with USB devices such as printers, video cameras and mass storage devices.
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13.6.2 USB software architecture
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The standard Symbian OS USB software architecture provides support for USB device (or client) functionality. Our implementation is designed to work with a hardware USB Device Controller (UDC). UDCs provide a set of endpoints of varying transfer type (bulk, control and so on), of varying direction (IN, OUT or bidirectional) and varying packet size. UDCs normally allow these endpoints to be grouped together into various different USB interfaces and con gurations. This means that a single Symbian OS phone can be con gured for different USB device functions so long as it contains the appropriate (device) class driver. This also means that as long as the UDC provides enough endpoints, the phone can be con gured as a multi-function device. Figure 13.13 shows an overview of the Symbian OS USB software architecture. As an example, Figure 13.13 shows the setup for a phone con gured as a combined Abstract Control Model (ACM) and mass-storage USB device. (However, when the host con gures a device containing multiple functions, it enables each of these and requires a class driver for each. In practice, it can be dif cult to obtain the corresponding composite host-side driver setup for this type of combined functionality.)
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Figure 13.13 An overview of the Symbian OS USB architecture
The USB manager ensures the orderly startup and shutdown of all the USB classes on the Symbian phone, as well as allowing its clients to determine the status of these classes and to be informed of changes in the overall USB state. To this end, the USB Manager implements a class controller for each supported class on the device. A class controller provides the interface between the USB manager and the class implementation but does not implement any class functionality itself. USB class implementations normally exist in a separate thread from the USB manager. To gain access to the USB hardware (UDC), the USB class implementation must open a channel on the USB client device driver. The class RDevUsbcClient provides the user-side interface to this driver. Each channel supports only a single main USB interface (although it may support multiple alternate interfaces). This means that class implementations that use two or more main interfaces must open multiple channels.