HP EZ-KIT Manual de usuario descargar pdf (Pagina 90)

Example 7: Creating a VDK Application

6-6 Getting Started with ADSP-BF548 EZ-KIT Lite

The VDK runtime system is instructed to create and start execu-

tion of one instance of

BootThreadType as a boot thread when

initializing the application.

• The I/O Interface subsection defines one type of VDK device

driver (KeypadDriver) and instructs VDK to create one instance of

the device driver during application initialization.

• The Device Flags subsection defines the flag (KeypadFlag), which

is the means of synchronization between the interrupt-domain and

thread-domain code in KeypadDriver.

• The Messages subsection specifies the maximum number of VDK

messages that can exist simultaneously in the application and

directs VDK to allocate space for messages from the standard mem-

ory heap.

When the project was created, the Project Wizard generated header files

and skeleton code files for the two thread types and device driver type.

The wizard can produce C++, C, or assembly versions of the files; C ver-

sion was selected for this project. The wizard also generated the VDK.h and

VDK.cpp files. The header file contains pre-processor definitions that

enable or disable VDK features, enumerations for identifier values for the

application’s thread and device types, and gives access to the whole VDK

public API. The source file contains the VDK objects that correspond to

the application’s boot time thread, device, and device flag.

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HP EZ-KIT Manual de usuario Pagina 90