Analog Devices VisualDSP++ 5.0 Service Manual page 60

Device Driver Overview
The device manager architecture is illustrated in
DEVICE
DRIVER
COMPONENTS
Figure 1-2. Device Manager Architecture
The device manager also provides the API to the application for each
device driver. This ensures that the application has the same consistent
interface regardless of the peculiarities of each device.
While there is only one device manager in a system, there can be any num-
ber of physical drivers in a system. A physical driver is that component of a
device driver that accesses and controls the physical device. The physical
driver is responsible for all the "bit banging" and control and status regis-
ter manipulations of the physical device. All device-specific information is
contained and isolated in the physical driver.
1-22
APPLICATION
RTOS (OPTIONAL)
DEVICE MANAGER
PHYSICAL
DRIVER
SYSTEM SERVICES
VisualDSP++ 5.0 Device Drivers and System
Services Manual for Blackfin Processors
Figure 1-2.
PHYSICAL
PHYSICAL
DRIVER
DRIVER