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Compiler -D Options (Blackfin, Embedded Module)

You can modify the default initialization values of the Device VIs using compiler -D macros. Enter the compiler -D macros in the Additional compiler flags text box, located on the Advanced tab of the Application Information category in the Build Specification Properties dialog box. To enter a compiler -D option, enter -D followed by the macro name, an equals sign, and the value you want. For example, –D VDK_NUM_DEVICES=5. The compiler -D options affect how the Blackfin device operates.

The following table lists the available -D compiler macros and default values.

Compiler Macro Description Default Value
VDK_NUM_DEVICES Sets the maximum number of device drivers you can open simultaneously. 10
VDK_NUM_DMA_CHANNELS Sets the maximum number of DMA channels you can open simultaneously. 4
VDK_NUM_DBC_ENTRIES Specifies the maximum number of queue entries. Deferred callbacks are used instead of live callbacks when the number of entries is greater than zero. 0
VDK_NUM_INT_HANDLERS Specifies the number of secondary handlers the Blackfin application uses. 3

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